This is the best tutorial on mooring analysis using Aqwa, it saved me a lot of time trying to search for tutorials, as there is not much information except Aqwa manual which lacks step by step tutorials, thanks Xavier for uploading this tutorial.
Hi Xavier, thanks a lot for your clear and detailed video. I started and learnt a lot on ANSYS Aqwa with it. I used your Wind Turbine model to carry out simulations in the context of an internship. Thus, I would like to reference your work in my final report. Is it ok for you if I only mention your name and the url of the video in the list of references? Thanks
in 12:11 how can u know that the chain diameter=4.7 inch, polyester diameter= 8.4 inch and power cable diamter= 4, in my study i reduce the total height of FOWT to 20m height how about the moring line properties MBL, EA and so on?
You do some preliminary runs with storm conditions. Check the level of peak load on mooring than select the best choice on mooring suppliers catalogs. Then try again. And recheck. For fatigue checknit will require more work. This is just a preliminary sizing
I followed every step perfectly but I couldn’t solve solution A5. It showed illegal connectivity element & mass displaced mass are significantly different from structure#1. Please help!
Hi. It should be the element mesh from model with inverted face normals (pointing inwards) and resulting in negative volume. This is frequent problem. Use Spaceclaim and find face normals, they should be pointing outwards. Otherwise, check units so the estimated mass from model mesh and total from those added at geometry mass points are about same.
Hi! Thanks for the video I am using linear catenary cables for analysis of a TLP. I'm getting a range of tension from negative to positive, the negative tension doesn't make any sense since slack cable should have zero tension..Can anyone explain why negative tension values are calculated?
Hi Xavier thanks for this video. I have three questions: 1)Do you plan to do a video for a semi-submersible type, for example, the VolturnUS-S? 2) How does one get the frequency domain hydrodynamic coefficients (added mass and damping)? I am using OpenFAST but would like to get the coefficients because I am using different wave directions from that given in the OpenFAST model. 3) Do you know how to convert the hydrodynamic coefficients from ANSYS format to WAMIT format?
Hi Andre. I´d like to do the same for a semi, but a steel hull like Windfloat. In Ansys, after the run is completed, all hydrodynamic coefficients vs frequency and direction are available in the outputs in the form of line plots. You might be able to copy the line plot results from tabular format and paste in excel. Not sure how to make it available for Wamit if not done manually. I know Aqwa hydrodynamic data can be read by Orcaflex. And Orca also reads Wamit. But it is not what you need. Ansys and Wamit do the same task. What you can do is compare their output after run.
Hello Xavier, thank you for sharing. please a quick question on the spaceclaim CAD model, Did you model the spar hull and turbine as a solid or shell? if it is a shell, what is the thickness used for the spar hull and turnine? thanks 🙏
Hi. You can make it solid. But in the end remove/detach one face to make it a surface body. It must be closed at all sides underwater and normals pointing outwards. Above water it can be anything. Its just representative. Thickness does not matter so 1 mm is fine. Your welcome 🤙
Good that is useful. Both Hydrodynamic drag or aerodynamic drag can be added by drag force coefficients. In this case you'll also need to apply wind and current. Check video around 39 min 30 s and the user manual for the coefficients equations
This video is one of the best tutorials for Aqwa in the field of floating wind turbines. Can I have your email or Linkedin ID? I'm working on semi-submersible DeepCwind FOWT design and I'm trying to import hydrodynamic loads to Ansys structural after getting results in Aqwa.
@@xavicastello1 Hi, thank you for sending your Linkedin ID, I sent you a connection request. That video's name is load mapping(tutorial no.7), but unfortunately it uses just surface and beam of a Spar model for Ansys structural while I want to use 3D structural elements like Solid or shell not surface type to analyze better stresses on the body specially on joints. For Aqwa surface and beam is ok, but not for structural analysis.
Hi. sorry, but this comes from some previous work experience. I do not have references. Perhaps in Handbook of Offshore Engineering of Chakrabarti. But one easy way is you get steel mass data and divide by steel volume. To get it more precisely try geting from preliminary contruction phases, like before internals and outfittings are installed
It should work if the stiffness is correct. But they will always be in tension or compression which is not the same as a line that can rest if not in tension
@Xavier Hi there, love this video. I'm calculating inertia for the nacelle/hub/rotor combo at the moment as part of my final year project. I seem to be getting a much lower value for Ixx,Iyy than the one you calculated at 1.7e09 kg*m^2, is there a certain way that you calculated it? This will be a big help. Thanks
Good morning from Spain I´m currently doing my final degree project about a spar structure to soport PV panels. I´m also working with Aqwa and I´m manufacturing some prototipes. I have a question, why diference between CoG and CoB must be higher than 3 or 5? In my simulations, I realized that, if this diference is smaller, it doesn´t work as well as it should do, but I can´t find any document with the theory of this. I hope you read it and could answer me Thank you for this type of videos!
Hi xavier! Can you please give me the research paper from where you have taken the dimensions of FOWT and other results, bcz i need it for validation of my master's project. Thanks in advance
As an engineering student, i was working on this model. During solving stage, i was encountered with an error denotinf illegal connection between elements(with element number specified). The solver aborts with displaying this error. Could you please provide a solution for that?
I was also facing the same, but I have changed some geometry of blades such as tried different models separated the blades from the root and changed the angle of rotation from vertical that rotates the blades from root as a whole
It's the mesh generated at the blades and hub probably causing issues. Try different mesh sizes there. Or go back to spaceclaim and fix any geometry slivers, overlapping faces etc
Hey. please, reach out to your thesis advisor. Ask for hydrodynamics and/or Ansys Aqwa training. Also, find Ansys support pages the training material they have.
I faced an error of "elements must be at least 1.000 Facet Radius apart" and another error of " the ratio of the areas of adjacent elements must be greater than 0.333" and the solution was always aborting. So I checked "YES" for "Ignore modeling rule violations" in "Analysis settings". does this affect the quality of the solution?
Is probable that quality is affected. You may have elements with normals pointing against each other too close and poor mesh growth rate control. Not sure. Try using mesh quality controls
Hello xavier can you please share your excel file and add a link in the description to download the software ansys aqwa, it would be fantastic great work!
May i ask you sth?At hydrostatic results ,the actual displacement is different from the equivalent(about 0,7%),while CoB and CoG have the correct values from the excel.Why does it happen?Coz of mesh?And r the wind turbine blades cad free at the above site that u used it for?
@@antegafh Hi. Yes. Element mesh is an approximation. They are plane quadrilaterals or triangles on a circular shape. It will never match unless you refine to infite # of elements. Anything above seawater level is not used for any calculation in linear hdrodynamic panel method. They are for visualization only in this model
Goodday Xavier, Thank you once again! Please how do I apply (input) custom wave frequencies on the structure rather than letting aqwa set up input frequecies automatically? I have a set of wave periods (T) with its wave height (H) for a location, and I want to use these specified sets of frequencies for my analysis
not sure I got your question. To get the hidrostatic behavior of the platform its better to have a wide range of frequencies calculated. Then when you apply waves, you can select linear waves with manual settings of frequency or period and height. Its just a matter of changing the range to single and from program controlled to manual parameters
@@xavicastello1 Does that mean for the range of frequencies chosen only one wave aplitude can be applied (say 2m wave aplitude)? for the same range of frequencies and diffirent wave amplitude (say 3m amplitude), does that mean another simulation need to be made? The data I have got multiple wave frequencies with each frequency having its different corresponding wave amplitude. I learn that I can change the wave amplitude from pressures and motion tab, However, I'm not sure if it has any effect on the RAOs. Thank you
Does the wave frequecies automatically generated has a default wave amplitude (say 1m wave)? if yes, how can we apply custom wave amplitude or wave height?
@@mmnyako it is linear wave theory and wave height does not matter to run solution. Postprocessing results is where you can chose height. just play with the buttons and you find it.
When uploading the the propeller the size is very small , however when you are uploading the propeller it is coming perfectly scaled to your design . Can anyone help me out please!
I am following the same tutorial. Each and everything is same but i am receiving an error of illegal connectivity after solution command. Can anybody please help me to solve this error ?
@@emmanuelsunday863 it should be enough if element size allows calculation of the wave frequencies you need. However it is always good to do a mesh sensitivity study
Hi, this can only be rougly estimated by assuming a uniformly distributed mass in a volume, if you know the mass. Otherwise you need to get this data from manufacturers.
@@xavicastello1 Mr. Xavier, thank you for your reply, I would like to ask, according to NREL's research report, can we roughly estimate its mass and moment of inertia through the method in your video? I am a graduate student from Taiwan, currently The 5MW and 15MW floating offshore wind turbines have been analyzed through NREL and IEA references, and although the references already give the mass and location of the components, I'm curious to know how to configure the mass simply and accurately. Thank you.
@@noahlin7221 The inertia for the hull cylinders is easy. But inertia for Nacelle and Hub will be more complicated. You will need to assume uniform mass distributed in a brick volume. then use inertia equations for this volume shape. There will be an error as nacelle base frame, powertrain and other components are not uniformly distributed. But what else can you do without manufacturer properties? If you want also blades inertia, that is even harder, as they are complex geometries and flexible. Inertia changes in flap or edge axis. Better try to model in CAD something and take inertias from there maybe.
@@xavicastello1 Mr. Xavier, thank you for your reply. In addition, I would like to ask if you have any experience in importing aqwa hydrodynamic pressure into ansy mechanical. I have some questions about the difference in quality between the two. I would like to ask you, thank you.
@@noahlin7221 Hi my experience regarding that is limited. Ansys has a built-in tool to make the transfer. Any other way will need to be programmed. Regards
I am getting this error while solving the simulation. ILLEGAL CONNECTIVITY. Element 2985 is joined to element 3376 and element 4775. Anyone knows how to prevent this error?
Dear Xavier, thank you for this awesome tutorial. Can you please make a tutorial for a semi-submersible type of FOWT? And, also, can we include the movement of the turbines when it is operating? Do you have a source for that?
Great that it's being useful, there's so little out there about calculating a hull from a sketch. A semi hull is similar work. Inertias is more complex and complete GM for stability calculation. I'll try but will take time. Making the rotor rotating animation is what you mean? I don't think it is possible in Aqwa.
@@xavicastello1 what I meant to ask is, can we make a coupled analysis with Aqwa? I want to make a mooring line analysis for my msc. thesis, so I want to include both the hydrodynamic and aerodynamic affects on all the structure especially on mooring lines. The rotation of the blades have an affect overall right? Or, are we just adding the wind and assuming that the blades are not moving?
Hummm. Yes. All loads due to wind or current can be added usind drag force coefficients. I think it is shown close to the end of video where you add them. You will need to know first the drag force or the total force while turbine is operating, if the analysis is for operating load case. I don't think the rotating body gyroscopic effect or changes in inertia are relevant. But I'm not experienced with such kind of analysis. Better would be tonhave the complete load components set for the load case you need obtained by a loads engineer from wind turbine simulation. Calculating Aerodynamic loads from the turbine is a master thesis already. 🤣
@@xavicastello1 Dear Xavier, I wanted to thank you again and I just wanted to say that I want to add your name to my thesis acknowledgments section. I was really lost with all the information I was reading, but this video gave me a starting point. Can you maybe give your name, title, etc. so I can put your name if it is okay for you?
Hi Xavier, Thanks for sharing this video. It is very informative. If it was a different case, for instance a squared system, wouldn't you split it first to define under water and above water area? Or you will define it in diffraction analysis model?
Also, if you are in shallow water depth, the way you calculated line depth and length won't provide realistic values especially when you are using catenary mooring where most part of the chain is lying on the seabed. Let's say when you have a squared system
Hi. yes. you need to first split body in CAD at water elvel before importing to Aqwa. In diffraction Ansys automatically finds what is below water, or you can select manually too.
@@Mazhar0495 This simulation was made assuming taut-leg mooring system. So for catenary you need to either have the analytical catenary equations in Excel or do it iteratively in Ansys Aqwa directly.
@@xavicastello1 Thanks for your reply. I see that you are using some known values such as top tension factor=0.15. May I ask where did you take them from? Also, do they stay same for catenary case?
@@Mazhar0495 humm. I do not recall a reference for this. It might be a common practice. But it will for sure impact the top angle you want for your system
This is the best tutorial on mooring analysis using Aqwa, it saved me a lot of time trying to search for tutorials, as there is not much information except Aqwa manual which lacks step by step tutorials, thanks Xavier for uploading this tutorial.
This is the best ANSYS AQWA tutorial on youtube by far!! thanks so much !!
great job... It takes months to learn software like ansys AWQA and a very big heart to share it for free.. ( A salute and love from India)
The best tutorial on RUclips!
Great great greaaaaaaaaat tutorial, thank you Xavier for your effort and detailed explanation ♥
Very good video and explanation. Thank you.
Thankyou so much sir for this tutorial ❤️
Thank u very much for your efforts!!!!!
Do you know how to add the intermediate buoy or clump weight to moorling line ?
I can not use SLDPRT file in Ansys directly like yours. Can anyone help me how to insert this SLDPRT file in Ansys?
EXELENT ITS DE BEST
Hi Xavier, thanks a lot for your clear and detailed video. I started and learnt a lot on ANSYS Aqwa with it. I used your Wind Turbine model to carry out simulations in the context of an internship. Thus, I would like to reference your work in my final report. Is it ok for you if I only mention your name and the url of the video in the list of references? Thanks
Glad it helped. Yes. Already other Master student has referenced. No problem
excellent
in 12:11 how can u know that the chain diameter=4.7 inch, polyester diameter= 8.4 inch and power cable diamter= 4, in my study i reduce the total height of FOWT to 20m height how about the moring line properties MBL, EA and so on?
You do some preliminary runs with storm conditions. Check the level of peak load on mooring than select the best choice on mooring suppliers catalogs. Then try again. And recheck. For fatigue checknit will require more work. This is just a preliminary sizing
Can I get semi submersible fowt video?
Hello sir, i am getting an error saying cut water plane area due to panel element is not zero for structure 1 in SSTR data record
Can you help me with that?
wow😮
I followed every step perfectly but I couldn’t solve solution A5. It showed illegal connectivity element & mass displaced mass are significantly different from structure#1. Please help!
Hi. It should be the element mesh from model with inverted face normals (pointing inwards) and resulting in negative volume. This is frequent problem. Use Spaceclaim and find face normals, they should be pointing outwards. Otherwise, check units so the estimated mass from model mesh and total from those added at geometry mass points are about same.
@@xavicastello1 tried to fix that but still error. Can share the project file with me?
Hi!
Thanks for the video
I am using linear catenary cables for analysis of a TLP. I'm getting a range of tension from negative to positive, the negative tension doesn't make any sense since slack cable should have zero tension..Can anyone explain why negative tension values are calculated?
I have a question, how do I make the mooring lines in a model? thank you very much.
Watch the video
Hi Xavier thanks for this video. I have three questions: 1)Do you plan to do a video for a semi-submersible type, for example, the VolturnUS-S? 2) How does one get the frequency domain hydrodynamic coefficients (added mass and damping)? I am using OpenFAST but would like to get the coefficients because I am using different wave directions from that given in the OpenFAST model. 3) Do you know how to convert the hydrodynamic coefficients from ANSYS format to WAMIT format?
Hi Andre. I´d like to do the same for a semi, but a steel hull like Windfloat. In Ansys, after the run is completed, all hydrodynamic coefficients vs frequency and direction are available in the outputs in the form of line plots. You might be able to copy the line plot results from tabular format and paste in excel. Not sure how to make it available for Wamit if not done manually. I know Aqwa hydrodynamic data can be read by Orcaflex. And Orca also reads Wamit. But it is not what you need. Ansys and Wamit do the same task. What you can do is compare their output after run.
@@xavicastello1 Thanks and noted.
Hi Xavier, I have some warnings I don't know why but I am stucked. I want to share my file with you if it is possible. Could you help me, please?
Hello Xavier, thank you for sharing.
please a quick question on the spaceclaim CAD model, Did you model the spar hull and turbine as a solid or shell? if it is a shell, what is the thickness used for the spar hull and turnine? thanks 🙏
Hi. You can make it solid. But in the end remove/detach one face to make it a surface body. It must be closed at all sides underwater and normals pointing outwards. Above water it can be anything. Its just representative. Thickness does not matter so 1 mm is fine. Your welcome 🤙
Hi Xavier. Thank you for a very helpful video. Do you have any suggestions on how to apply the aerodynamic loads?
Good that is useful. Both Hydrodynamic drag or aerodynamic drag can be added by drag force coefficients. In this case you'll also need to apply wind and current. Check video around 39 min 30 s and the user manual for the coefficients equations
Can u explain how to replace spar with a tlp
hi can i get a video on design of monopile in ansys
This video is one of the best tutorials for Aqwa in the field of floating wind turbines. Can I have your email or Linkedin ID?
I'm working on semi-submersible DeepCwind FOWT design and I'm trying to import hydrodynamic loads to Ansys structural after getting results in Aqwa.
Hi, here www.linkedin.com/in/castellox/ I think there is Ansys tutorial for that load transfer, I remember of seeing.
@@xavicastello1 Hi, thank you for sending your Linkedin ID, I sent you a connection request.
That video's name is load mapping(tutorial no.7), but unfortunately it uses just surface and beam of a Spar model for Ansys structural while I want to use 3D structural elements like Solid or shell not surface type to analyze better stresses on the body specially on joints. For Aqwa surface and beam is ok, but not for structural analysis.
Hai i am also thinking to work on Floating offshore wind turbines
Can you have vedio of installation this software
Very helpful video. Thanks for the effort! Could you please provide a reference for the values used in the preliminary steel weight estimation?
Hi. sorry, but this comes from some previous work experience. I do not have references. Perhaps in Handbook of Offshore Engineering of Chakrabarti. But one easy way is you get steel mass data and divide by steel volume. To get it more precisely try geting from preliminary contruction phases, like before internals and outfittings are installed
Thanks Xavier! Very detailed tutorial. Can the deformation/stresses of the structure be also measured?
For this you need to transfer hydrostatic pressure to a structural static model in workbench and calculate stresses there
what if there are spring conncetions instead of cable connections to the ocean bed?like for a small buoy near the shore?
It should work if the stiffness is correct. But they will always be in tension or compression which is not the same as a line that can rest if not in tension
hi Xavier, with 3x chain cables, how did you avoid the message that the time step is too big?
If you have this problem you should try increasing lines elements/divisions, reducing solver increment time step
Amazing! Is the Ansys file avaliable publicly?
Hi. No. It’s not sorry for that
@Xavier Hi there, love this video. I'm calculating inertia for the nacelle/hub/rotor combo at the moment as part of my final year project. I seem to be getting a much lower value for Ixx,Iyy than the one you calculated at 1.7e09 kg*m^2, is there a certain way that you calculated it? This will be a big help. Thanks
how are you calculating these values?
Hi could you plz offer some data about this? Like heave, pitch and roll
You can have a look at the end when results appear or find research papers in research gate
Good morning from Spain
I´m currently doing my final degree project about a spar structure to soport PV panels.
I´m also working with Aqwa and I´m manufacturing some prototipes.
I have a question, why diference between CoG and CoB must be higher than 3 or 5?
In my simulations, I realized that, if this diference is smaller, it doesn´t work as well as it should do, but I can´t find any document with the theory of this.
I hope you read it and could answer me
Thank you for this type of videos!
To be honest I don't remember where these numbers came from. I guess it is common practice for offshore semis.
Hi xavier!
Can you please give me the research paper from where you have taken the dimensions of FOWT and other results, bcz i need it for validation of my master's project.
Thanks in advance
Hi. The Equinor's Hywind project information is on the web
hi how did you scale the wind turbine you downloaded from grabcad at 19:00
Using the Pull/scale tool in Spaceclaim: help.spaceclaim.com/2015.0.0/en/Content/Scaling_solids_and_surfaces.htm
How can I make blades rotatable, In my model its not possible to make blades rotatable. Could you help me
The purpose of Aqwa is hydrodynamics. Animations are not available. As far as I know
As an engineering student, i was working on this model. During solving stage, i was encountered with an error denotinf illegal connection between elements(with element number specified). The solver aborts with displaying this error. Could you please provide a solution for that?
I was also facing the same, but I have changed some geometry of blades such as tried different models separated the blades from the root and changed the angle of rotation from vertical that rotates the blades from root as a whole
It's the mesh generated at the blades and hub probably causing issues. Try different mesh sizes there. Or go back to spaceclaim and fix any geometry slivers, overlapping faces etc
Can I pay for private teaching..?
I have a thesis to write and Aqwa simulation is required..!
Hey. please, reach out to your thesis advisor. Ask for hydrodynamics and/or Ansys Aqwa training. Also, find Ansys support pages the training material they have.
how did you calculate Ixx, Iyy for fixed ballast?
Its in the excel. It is a solid cyclinder inertia equation
I faced an error of "elements must be at least 1.000 Facet Radius apart" and another error of " the ratio of the areas of adjacent elements must be greater than 0.333" and the solution was always aborting. So I checked "YES" for "Ignore modeling rule violations" in "Analysis settings". does this affect the quality of the solution?
Is probable that quality is affected. You may have elements with normals pointing against each other too close and poor mesh growth rate control. Not sure. Try using mesh quality controls
@@xavicastello1 Thanks
Hello xavier can you please share your excel file and add a link in the description to download the software ansys aqwa, it would be fantastic
great work!
Yes please, it would be very helpful
Thank you a lot for this helpful tutorial.May i ask how do we insert a heave plate at the bottom of the spar(not a heave disc)...?
If you need it to have volume you need to model it in CAD. Otherwise use the disks and set a added mass and drag coefficients
Thank you!.May i also ask,how does it show natural modes?Because i tried and didnt allow that
@@antegafh There's not a single natural mode. It is the RAOs what you may be refering to
May i ask you sth?At hydrostatic results ,the actual displacement is different from the equivalent(about 0,7%),while CoB and CoG have the correct values from the excel.Why does it happen?Coz of mesh?And r the wind turbine blades cad free at the above site that u used it for?
@@antegafh Hi. Yes. Element mesh is an approximation. They are plane quadrilaterals or triangles on a circular shape. It will never match unless you refine to infite # of elements. Anything above seawater level is not used for any calculation in linear hdrodynamic panel method. They are for visualization only in this model
Hi exavier
Can u provide us with the file model pls?
Sorry. But no
Goodday Xavier, Thank you once again!
Please how do I apply (input) custom wave frequencies on the structure rather than letting aqwa set up input frequecies automatically?
I have a set of wave periods (T) with its wave height (H) for a location, and I want to use these specified sets of frequencies for my analysis
not sure I got your question. To get the hidrostatic behavior of the platform its better to have a wide range of frequencies calculated. Then when you apply waves, you can select linear waves with manual settings of frequency or period and height. Its just a matter of changing the range to single and from program controlled to manual parameters
@@xavicastello1 Does that mean for the range of frequencies chosen only one wave aplitude can be applied (say 2m wave aplitude)?
for the same range of frequencies and diffirent wave amplitude (say 3m amplitude), does that mean another simulation need to be made?
The data I have got multiple wave frequencies with each frequency having its different corresponding wave amplitude.
I learn that I can change the wave amplitude from pressures and motion tab, However, I'm not sure if it has any effect on the RAOs.
Thank you
Does the wave frequecies automatically generated has a default wave amplitude (say 1m wave)?
if yes, how can we apply custom wave amplitude or wave height?
@@mmnyako it is linear wave theory and wave height does not matter to run solution. Postprocessing results is where you can chose height. just play with the buttons and you find it.
When uploading the the propeller the size is very small , however when you are uploading the propeller it is coming perfectly scaled to your design . Can anyone help me out please!
I have the same issue, did you sort it out?
I am following the same tutorial. Each and everything is same but i am receiving an error of illegal connectivity after solution command. Can anybody please help me to solve this error ?
Your model mesh has problems. Remesh with different settings and try again
@@xavicastello1how can I know the best mesh settings?
@@emmanuelsunday863 it should be enough if element size allows calculation of the wave frequencies you need. However it is always good to do a mesh sensitivity study
Hello Mr. Xavier, I would like to ask how the moment of inertia Ixx, Iyy and Izz of WTG-5MW are calculated, thank you.
Hi, this can only be rougly estimated by assuming a uniformly distributed mass in a volume, if you know the mass. Otherwise you need to get this data from manufacturers.
@@xavicastello1 Mr. Xavier, thank you for your reply, I would like to ask, according to NREL's research report, can we roughly estimate its mass and moment of inertia through the method in your video? I am a graduate student from Taiwan, currently The 5MW and 15MW floating offshore wind turbines have been analyzed through NREL and IEA references, and although the references already give the mass and location of the components, I'm curious to know how to configure the mass simply and accurately. Thank you.
@@noahlin7221 The inertia for the hull cylinders is easy. But inertia for Nacelle and Hub will be more complicated. You will need to assume uniform mass distributed in a brick volume. then use inertia equations for this volume shape. There will be an error as nacelle base frame, powertrain and other components are not uniformly distributed. But what else can you do without manufacturer properties? If you want also blades inertia, that is even harder, as they are complex geometries and flexible. Inertia changes in flap or edge axis. Better try to model in CAD something and take inertias from there maybe.
@@xavicastello1 Mr. Xavier, thank you for your reply. In addition, I would like to ask if you have any experience in importing aqwa hydrodynamic pressure into ansy mechanical. I have some questions about the difference in quality between the two. I would like to ask you, thank you.
@@noahlin7221 Hi my experience regarding that is limited. Ansys has a built-in tool to make the transfer. Any other way will need to be programmed. Regards
I am getting this error while solving the simulation. ILLEGAL CONNECTIVITY. Element 2985 is joined to element 3376 and element 4775. Anyone knows how to prevent this error?
Mesh problems are common in older versions of Ansys. Try remeshing or newer version
@@xavicastello1 can I do mesh externally and connect it to the hydrodynamic diffraction?
How do I know that my mesh is off quality?
@@emmanuelsunday863 I don't think so. But I'm not sure
Hai sir, can u pls suggest some websites for Tendon/Tether properties
Hi
Search for "Oil States tendon"
Dear Xavier, thank you for this awesome tutorial. Can you please make a tutorial for a semi-submersible type of FOWT? And, also, can we include the movement of the turbines when it is operating? Do you have a source for that?
Great that it's being useful, there's so little out there about calculating a hull from a sketch.
A semi hull is similar work. Inertias is more complex and complete GM for stability calculation. I'll try but will take time.
Making the rotor rotating animation is what you mean? I don't think it is possible in Aqwa.
@@xavicastello1 what I meant to ask is, can we make a coupled analysis with Aqwa? I want to make a mooring line analysis for my msc. thesis, so I want to include both the hydrodynamic and aerodynamic affects on all the structure especially on mooring lines. The rotation of the blades have an affect overall right? Or, are we just adding the wind and assuming that the blades are not moving?
Hummm. Yes. All loads due to wind or current can be added usind drag force coefficients. I think it is shown close to the end of video where you add them. You will need to know first the drag force or the total force while turbine is operating, if the analysis is for operating load case.
I don't think the rotating body gyroscopic effect or changes in inertia are relevant. But I'm not experienced with such kind of analysis. Better would be tonhave the complete load components set for the load case you need obtained by a loads engineer from wind turbine simulation. Calculating Aerodynamic loads from the turbine is a master thesis already. 🤣
@@xavicastello1 Thank you so much! I am looking forward to your next videos.
@@xavicastello1 Dear Xavier, I wanted to thank you again and I just wanted to say that I want to add your name to my thesis acknowledgments section. I was really lost with all the information I was reading, but this video gave me a starting point. Can you maybe give your name, title, etc. so I can put your name if it is okay for you?
Hi Xavier, Thanks for sharing this video. It is very informative. If it was a different case, for instance a squared system, wouldn't you split it first to define under water and above water area? Or you will define it in diffraction analysis model?
Also, if you are in shallow water depth, the way you calculated line depth and length won't provide realistic values especially when you are using catenary mooring where most part of the chain is lying on the seabed. Let's say when you have a squared system
Hi. yes. you need to first split body in CAD at water elvel before importing to Aqwa. In diffraction Ansys automatically finds what is below water, or you can select manually too.
@@Mazhar0495 This simulation was made assuming taut-leg mooring system. So for catenary you need to either have the analytical catenary equations in Excel or do it iteratively in Ansys Aqwa directly.
@@xavicastello1 Thanks for your reply. I see that you are using some known values such as top tension factor=0.15. May I ask where did you take them from? Also, do they stay same for catenary case?
@@Mazhar0495 humm. I do not recall a reference for this. It might be a common practice. But it will for sure impact the top angle you want for your system
can i get the paper that u refer to built the wind turbine
At what time of the video is it?
@@xavicastello1 the dimensions of the drawing
the result for the simulation
I don't get it. Tell minutes of video time
@@xavicastello1 16.15 Can i get the dimension of the wind turbine and 44.28 the result of the simulation
Thanks so much for this video
Can I please have your Email..? I am currently facing some issues with my Geometry 🙏🏽🙏🏽
Hi how did you import the design at 23:00
Anything active that you have in Spaceclaim will be imported in Aqwa when you open it