This is really a straightforward and helpful tutorial! I'm doing a 2D simulation of fuel cylinder of nuclear reactor and this saves a lot of my time trying to figure out stuffs in the manual. Thanks for posting this!
i dont usually comment in youtube, but got to say this tutorial was amazing for me! Congrats on the very precise and well explained video and thanks a lot!
Thank you , This is extremely helpful! Can you also please show us how to plot coefficient of pressure around the cylinder -> Cp vs Theta. I have been struggling to do it
Hello Craig, Hope this finds you well. Thank you for your positive comment :). To plot the cp v/s theta you need to use the cylindrical coordinates. if you do not have one already then you may want to create a new coordinate system and after that, you can go to plots and create new plots and get the Cp v/s theta plot. Please let me know if you cannot find the option of creating a cylindrical coordinates.
Thanks for your great tutorial! When I try to do the Create badge for 2D meshing operation at @5:09 I don't see anything to check. What am I missing? Also, in the geometry scene, my part isn't visible. I have to select the part to highlight it. Thanks!
Thank you for watching TheZepside. Can you go to your 3d CAD Model and click update? sometimes if you do not click update you do not see your part in geometry. Also, make sure you have right clicked on bodies to create a new geometry part. That is the reason you are not getting any option to select any bodies for 2d meshing. Kindly, let me know if you are still facing the same problem. we can look into it in more detail. Thanks once again.
Thanks a lot for your answer. I figured it out though; I had no geometry intersecting the z=0 plane, so I couldn't generate an automated 2D mesh. I changed my geometry, and it worked. I want to ask you another thing while here. I have 39 different CAD files that I want to run simulations on. The geometries vary just a little from file to file, but what is the best way to run the exact same setup to different geometries? Quite cumbersome to copy everything to so many different .ccm files.. Thank you for helping! /Alex
Even i am facing the same issue with my research work where i have to modify only one part of the stage and i have to import the whole thing every time i try to run a new simulation. What i am trying to do is, i am keeping my variable part as a different body and then assembling the whole thing. so that i can open my 3d cad model and delete that part and replace it with new updated geometry. when you do this you would only have to update your 3d cad model/regions and boundary for that specific part. also, see if this link helps www.cfd-online.com/Forums/star-ccm/187556-meshing-pipeline-swapping-geometry-how-update-regions-boundaries.html I am using Solidworks to create my CAD files so it is easy to create parts and assemblies. t Let me know if you need more help on this matter, i could gladly ask other Star ccm users who are well versed with the software than i am to help you out. :)
Great tutorial! For a project of mine, I need to show the boundary layer and calculate its thickness over a flat plate. I did the simulation but I have no idea how to calculate the thickness. Can you somehow guide me if you know how to? Thank you very much=)
Hey Onur, Thanks for your comment. I hope i am not too late. I don't know much about boundary layer thickness calculation but it is possible to get an idea of BL thickness based on Wall Y+. Can you let me know if you have not figured it out. i would try my best to help you. my email id is mitansh.doshi@gmail.com. i regularly check my email unlike RUclips comments. Thanks and sorry, Mitansh
I calculated it by zooming in on the velocity profile over the flat plate and put a line probe with a proper length accordingly. Wherever the velocity profile=free stream velocity, thats where I tried to stop my line probe. Then, I proceeded to plot the values(created a plot): Y--> velocity magnitude and for parts choose the probes. For X axis make it display Y distance. From this plot I was able to see the velocity changes and hence the boundary layer thickness. =) Thank you!
cool. I was going to tell you to eyeball it after looking at the vector plot of velocity profile but your way is much better. Good luck and Thanks for watching the video.
Hello Haoyun Qiu, Thanks for the comment I appreciate it. I chose the high viscosity of water only to get lower Reynold's number. As we know from the equation that the Reynold's number and viscosity are inversely proportional.
hallo! can u pls let me know how i can find the discretization error based on force in cylinder and deformation of free surface ? thanks a lot in advance
Hello living on the ende, Thank you for the comment. Could you please explain a bit more about what exactly is discretization error definition you are interested here? :)
mitansh doshi ..thanks a lot for ur reply the question i got for my project is to simulate the flow around a cylinder submerged in water at a particular depth. am supposed to select the solution domain and initial grid. i have been asked to estimate the discritization errors( based on force on cylinder and deformation of free surface ) and analyse the effect of the submergence on force on the cylinder and the deformation of free surface. so what i did was to go the report option and selected the force and for the body the cylinder. but the solution i get as shear stress+pressure force is very much away from the expected solution or may be i did something wrong !
@@user-lb5jh2oo1d Your answer for shear stress+pressure is different because you may have not yet entered the values for variables such as density, direction of force you are interested in or so. Do you see any such options in report ? if not , you may have to change these variables under "functions" tab. Let me know if you are still struggling with this :)
mitansh doshi well in the report option i have selected the force in x direction and reference pressure as 0Pa. the problem is when i have the cylinder at a distance of 0.3m from the top of a 5m*1m (L*B) pipe at a distance of 2m from the entry the force value i get is around 24N but when the same cylinder is placed a distance of 0.5m from the top (all other options or meshing and stuffs kept. constant) the force value is 34N . well such a big difference in the force is what is making me wonder the mistake i have done . btw where do i find the „Function“ option ?
@@user-lb5jh2oo1d i think i am understanding your problem a bit better now. You said your problem statement is related to the submerged cylinder is that correct? Now if you have F=24N at 0.3m from the top and F=34N at 0.5 m from the top then in the second case (F=34N, @0.5m) you are more submerged in water correct? So you should be facing more force on the surface. Also, try putting the reference pressure as 1 atm. So all your pressure values would be measured from the reference. About the function option, try searching under tool tab.
Hello Ganesh Kumar, Thank for your feedback. It is told that for incompressible one should use Segregated flow solver and for compressible one should use Coupled flow solver. Even though segregated flow solver can handle mild compressibility but it is better to use the couple flow solver. I have confirmed this with Star CCM+ help section. Segregated Flow and Energy The Segregated Flow model is an alternative for incompressible or mildly compressible flows, particularly when computational resources are an issue; it is used with the Segregated Fluid Energy models. Coupled Flow and Energy The Coupled Flow and Coupled Energy models are best for compressible flows, natural convection problems, and flows with large body forces or energy sources. The Coupled Flow model includes the optional AUSM+ inviscid flux scheme, which is advantageous for flows involving high supersonic and/or hypersonic regimes. let me know if you have any more questions or concerns
@@mitanshdoshi79921. Can you please tell me what range is mildly compressible? 2. From the help I can understand that they are giving recommendations but no strict rules am i right? If seg is only for incomp and coupled is only for compressible, does it mean that I cannot run a high speed pulse detonation simulation using seg solver and flow past cylinder case in coupled method. Please confirm.
Ganesh Kumar, unfortunately, I do not know what range is mildly compressible. Star CCM+ help section doesn't give the clear idea about what should be the range for each of the flow solver. I think something below Mach number 0.3 could be treated as incompressible. so you can use that rule to gauge the idea of what type of solver you should use. Looking *online* quickly I did not find any strict rules so I think it is just a recommendation. I have not dealt much with the coupled flow solver so I cannot help you with your "high speed" detonation question. Maybe online CFD forum can help you with that better.
@@mitanshdoshi7992 No issues, already I have done detonation simulation in STAR-CCM+. Both coupled approach and segregated approach works fine. What I was trying to convey is, From my point of view the major diff between seg and coupled is the way we find pressure (SIMPLE scheme in seg) while coupled solves all together and requires some % of extra solving time. Of course when we take high speed flows it is better to go with coupled method than segregated method (I am not saying seg cannot be used), but ROE and AUSM+ with attractive pre conditioners holds upper hand in this. Thank you for the reply.
under the physics model, you would have an option of setting a temperature value to some number. by default it stays at 300 K as far as i know. Let me know if you need more explanation. :)
@@mitanshdoshi7992 thanks i figured it out...i first chose segregated fluid isothermal (according to my professor's instructions), temperature wasnt there, then i chose a different option and it worked...
@@mitanshdoshi7992 i wanna ask you about ship simulation. i want to know how to operate star CCM+ with my ship model. the results are getting resistance of ship, seakeeping and slamming. can you make tutorial how to run star CCM+?. thank you.
Thanks Joanna for your comment. Yes I am creating a 3D geometry first and then I am converting that into 2D geometry. You could directly do 2D model if you'd like however in the current video I am showing how you can convert a 3D geometry into 2D (based on the nature of the question on assignment).
Хобби
Extremely helpful! This is the only good tutorial I could find on 2D sims. Thank you!!
Ryan Schwab thanks for your comment 😄
This is really a straightforward and helpful tutorial! I'm doing a 2D simulation of fuel cylinder of nuclear reactor and this saves a lot of my time trying to figure out stuffs in the manual.
Thanks for posting this!
thanks very much for this very handy introduction to 2D simulation with Starccm+
i dont usually comment in youtube, but got to say this tutorial was amazing for me!
Congrats on the very precise and well explained video and thanks a lot!
Thank you Eduardo. I appreciate it :)
Great Tutorial
super nice and helpful!!!!!!!
thank u for giving us best video
Mitansh Bhai !!!! Job well done !!! Thanks a lot for helping us !!
haha thanks Bhai :)
Thank you very much for your video, it is very helpful
thanks a lot for the video. its amazing.
Thank you Sanson regi. :)
Nice 👍,it's really helped me..
Please make more videos..
Thank you..☺
Good work future Prof.
thank you for your comment :)
Great professor! 10/10! :p
Thanks :)
you sir, have saved my assignment :D
Hahaha Thank you my friend. Happy to help :)
great video motu :)
Great video. One thing to consider is that your sketch must be on the XY plane in order to get 2D mesh. Thank you again...
Thank you , This is extremely helpful!
Can you also please show us how to plot coefficient of pressure around the cylinder -> Cp vs Theta. I have been struggling to do it
Hello Craig,
Hope this finds you well.
Thank you for your positive comment :). To plot the cp v/s theta you need to use the cylindrical coordinates. if you do not have one already then you may want to create a new coordinate system and after that, you can go to plots and create new plots and get the Cp v/s theta plot. Please let me know if you cannot find the option of creating a cylindrical coordinates.
Thanks for your great tutorial!
When I try to do the Create badge for 2D meshing operation at @5:09 I don't see anything to check. What am I missing?
Also, in the geometry scene, my part isn't visible. I have to select the part to highlight it.
Thanks!
Thank you for watching TheZepside.
Can you go to your 3d CAD Model and click update? sometimes if you do not click update you do not see your part in geometry. Also, make sure you have right clicked on bodies to create a new geometry part.
That is the reason you are not getting any option to select any bodies for 2d meshing.
Kindly, let me know if you are still facing the same problem. we can look into it in more detail.
Thanks once again.
Thanks a lot for your answer. I figured it out though; I had no geometry intersecting the z=0 plane, so I couldn't generate an automated 2D mesh. I changed my geometry, and it worked.
I want to ask you another thing while here. I have 39 different CAD files that I want to run simulations on. The geometries vary just a little from file to file, but what is the best way to run the exact same setup to different geometries? Quite cumbersome to copy everything to so many different .ccm files..
Thank you for helping!
/Alex
Even i am facing the same issue with my research work where i have to modify only one part of the stage and i have to import the whole thing every time i try to run a new simulation.
What i am trying to do is, i am keeping my variable part as a different body and then assembling the whole thing. so that i can open my 3d cad model and delete that part and replace it with new updated geometry. when you do this you would only have to update your 3d cad model/regions and boundary for that specific part.
also, see if this link helps
www.cfd-online.com/Forums/star-ccm/187556-meshing-pipeline-swapping-geometry-how-update-regions-boundaries.html
I am using Solidworks to create my CAD files so it is easy to create parts and assemblies. t
Let me know if you need more help on this matter, i could gladly ask other Star ccm users who are well versed with the software than i am to help you out. :)
Great tutorial!
For a project of mine, I need to show the boundary layer and calculate its thickness over a flat plate. I did the simulation but I have no idea how to calculate the thickness. Can you somehow guide me if you know how to?
Thank you very much=)
Hey Onur,
Thanks for your comment. I hope i am not too late. I don't know much about boundary layer thickness calculation but it is possible to get an idea of BL thickness based on Wall Y+. Can you let me know if you have not figured it out. i would try my best to help you. my email id is mitansh.doshi@gmail.com. i regularly check my email unlike RUclips comments.
Thanks and sorry,
Mitansh
I calculated it by zooming in on the velocity profile over the flat plate and put a line probe with a proper length accordingly. Wherever the velocity profile=free stream velocity, thats where I tried to stop my line probe. Then, I proceeded to plot the values(created a plot): Y--> velocity magnitude and for parts choose the probes. For X axis make it display Y distance. From this plot I was able to see the velocity changes and hence the boundary layer thickness. =)
Thank you!
cool. I was going to tell you to eyeball it after looking at the vector plot of velocity profile but your way is much better.
Good luck and Thanks for watching the video.
what are the meshers used for the simulation?
I have a question: why do you set the viscosity of water that high?
Hello Haoyun Qiu, Thanks for the comment I appreciate it. I chose the high viscosity of water only to get lower Reynold's number. As we know from the equation that the Reynold's number and viscosity are inversely proportional.
@@mitanshdoshi7992 Noted. I understand. Thanks Mitansh!
@@hqiu7866 you are welcome :)
How do you view normal to the XY plane?
You can go to view icon with 4 arrows and that can show you the view on different plane.
Hope this helps
hallo!
can u pls let me know how i can find the discretization error based on force in cylinder and deformation of free surface ?
thanks a lot in advance
Hello living on the ende,
Thank you for the comment.
Could you please explain a bit more about what exactly is discretization error definition you are interested here? :)
mitansh doshi ..thanks a lot for ur reply
the question i got for my project is to simulate the flow around a cylinder submerged in water at a particular depth. am supposed to select the solution domain and initial grid. i have been asked to estimate the discritization errors( based on force on cylinder and deformation of free surface ) and analyse the effect of the submergence on force on the cylinder and the deformation of free surface.
so what i did was to go the report option and selected the force and for the body the cylinder. but the solution i get as shear stress+pressure force is very much away from the expected solution or may be i did something wrong !
@@user-lb5jh2oo1d Your answer for shear stress+pressure is different because you may have not yet entered the values for variables such as density, direction of force you are interested in or so. Do you see any such options in report ? if not , you may have to change these variables under "functions" tab. Let me know if you are still struggling with this :)
mitansh doshi
well in the report option i have selected the force in x direction and reference pressure as 0Pa.
the problem is when i have the cylinder at a distance of 0.3m from the top of a 5m*1m (L*B) pipe at a distance of 2m from the entry the force value i get is around 24N but when the same cylinder is placed a distance of 0.5m from the top (all other options or meshing and stuffs kept. constant) the force value is 34N .
well such a big difference in the force is what is making me wonder the mistake i have done .
btw where do i find the „Function“ option ?
@@user-lb5jh2oo1d i think i am understanding your problem a bit better now. You said your problem statement is related to the submerged cylinder is that correct? Now if you have F=24N at 0.3m from the top and F=34N at 0.5 m from the top then in the second case (F=34N, @0.5m) you are more submerged in water correct? So you should be facing more force on the surface. Also, try putting the reference pressure as 1 atm. So all your pressure values would be measured from the reference.
About the function option, try searching under tool tab.
Are you 100% sure that segregated is for incompressible and coupled is for compressible flow. I don't think so. Please confirm
Hello Ganesh Kumar,
Thank for your feedback. It is told that for incompressible one should use Segregated flow solver and for compressible one should use Coupled flow solver. Even though segregated flow solver can handle mild compressibility but it is better to use the couple flow solver.
I have confirmed this with Star CCM+ help section.
Segregated Flow and Energy
The Segregated Flow model is an alternative for incompressible or mildly compressible flows, particularly when computational resources are an issue; it is used with the Segregated Fluid Energy models.
Coupled Flow and Energy
The Coupled Flow and Coupled Energy models are best for compressible flows, natural convection problems, and flows with large body forces or energy sources. The Coupled Flow model includes the optional AUSM+ inviscid flux scheme, which is advantageous for flows involving high supersonic and/or hypersonic regimes.
let me know if you have any more questions or concerns
@@mitanshdoshi79921. Can you please tell me what range is mildly compressible? 2. From the help I can understand that they are giving recommendations but no strict rules am i right? If seg is only for incomp and coupled is only for compressible, does it mean that I cannot run a high speed pulse detonation simulation using seg solver and flow past cylinder case in coupled method. Please confirm.
Ganesh Kumar, unfortunately, I do not know what range is mildly compressible. Star CCM+ help section doesn't give the clear idea about what should be the range for each of the flow solver. I think something below Mach number 0.3 could be treated as incompressible. so you can use that rule to gauge the idea of what type of solver you should use. Looking *online* quickly I did not find any strict rules so I think it is just a recommendation.
I have not dealt much with the coupled flow solver so I cannot help you with your "high speed" detonation question. Maybe online CFD forum can help you with that better.
@@mitanshdoshi7992 No issues, already I have done detonation simulation in STAR-CCM+. Both coupled approach and segregated approach works fine. What I was trying to convey is, From my point of view the major diff between seg and coupled is the way we find pressure (SIMPLE scheme in seg) while coupled solves all together and requires some % of extra solving time. Of course when we take high speed flows it is better to go with coupled method than segregated method (I am not saying seg cannot be used), but ROE and AUSM+ with attractive pre conditioners holds upper hand in this. Thank you for the reply.
Ganesh Kumar no worries. thanks for the additional information. I would look up more about ROE and AUSM+.
how to set a constant temperature value?
under the physics model, you would have an option of setting a temperature value to some number. by default it stays at 300 K as far as i know.
Let me know if you need more explanation. :)
@@mitanshdoshi7992 thanks i figured it out...i first chose segregated fluid isothermal (according to my professor's instructions), temperature wasnt there, then i chose a different option and it worked...
@@nimbletim Glad to know. Sorry for the late response :) I was away for the winter break :)
hello, permissions ask questions about, resistace ship, seakeeping, slamming, in the star CCM application🙏
Thanks for your comment Frans. I have not done any simulations in Star CCM+ for ship. Could you be a bit more specific about what you are looking for?
@@mitanshdoshi7992 i wanna ask you about ship simulation. i want to know how to operate star CCM+ with my ship model. the results are getting resistance of ship, seakeeping and slamming. can you make tutorial how to run star CCM+?. thank you.
Hi, sorry - why do you extrude?? I thought you wanted a 2D model? Are you creating a 3D model by Extruding?? Many thanks.
Thanks Joanna for your comment. Yes I am creating a 3D geometry first and then I am converting that into 2D geometry. You could directly do 2D model if you'd like however in the current video I am showing how you can convert a 3D geometry into 2D (based on the nature of the question on assignment).