Here is a question, why the rotor and nacelle are disconnected in the model, if we want to get the displacement of the nacelle, can this simulation work?
Thank you for your great tutorial video. However I found some "missing links" after 45:32, where you suddenly just jump into the post-processing and I really need to know the details so that I can implement the knowledge into my study. Could you help me find those "missing links"? Thank you.
Dear Salim, Thank you for your interest in this video. You can watch the video below, which is a more complete version of this: ruclips.net/video/kaCoBw8ynhM/видео.html
I wanted to do a simulation of a floating box with a mooring line attachment using STAR-CCM+ . Could you explain to me how to model the mooring line in STAR-CCM+?
What differences in the physics setup would there be if rotation speed is not specified? For example, if you wanted to calculate how fast the turbine would spin at a given wind speed?
Dear Tony, thank you for writing. If you wanted to calculate the wind turbine rotational speed, you need to use the overset grid, as the sliding mesh technique is not suitable for this case. I hope this helps! Respectfully, Mojtaba Maali.
@@Tony-eg4ic I think the continua will continue the same, for more information on this please have a look at this video: ruclips.net/video/AZkuHDzSqks/видео.html With overset mesh, you can either specify the value of the rotational speed or you can obtain the value of the rotor rotational speed by considering it as a variable.
Thank you so much. Im interesing how to make a wake behind the turbine. You have used volume control under mesh 2, please, tell us how to assign this part?
Dear Maria, Thank you for your interest in this video. TO understand how to assign a part to a volumetric mesh refinement, I recommend watching this video: ruclips.net/video/AZkuHDzSqks/видео.html I hope this was helpful. Respectfully, Mojtaba Maali.
@@CFD_Mojtaba thank you 😉 I repeated all the steps, but I can't get a wake after turbine, maybe I didn't set up the scene. Can you tell me how to get a wake of a wind turbine?
@@Maria-73 First go to derived parts, isosurface, under scalar select the Q-criterion. Set the isovalue to 5. Select no displayer and then create. Then right click on scenes, new scene, select scalar. Under displayers, click on outline 1. Uncheck outline. Check surface. Set the color to constant. Under outline 1, set the parts to the wind turbine components. Set the color to a more distinct one. Change the orientation to -x -z Now click on scalar 1. Set the Contour style to smooth filled. Now expand scalar 1. Set parts to isosurface. Set scalar field to velocity magnitude. Now you can see the wake propagation behind the wind turbine
Hello, Dear Friend! Thank you for your vast contribute to wind turine operate in Star-Ccm+ Software. I wonder how to simulate the operation of two or more wind turbines to observe how their wakes affect each other. Do I need set up all steps like in a case of a turbine or exist unevident things to simulate two or more turbines? Respectfully yours Maria
Dear Maria 1973, Thanks for your comment. You can use the same steps to configure your simulation for multiple wind turbines. However, the only point I would like to mention is about the computational cost as you want to analyze the effects of wake on wind turbine performance. Therefore, I would recommend that you use the actuator disk/line technique for this purpose. That way, you won't have to solve the detailed rotor geometry, which would significantly decrease the computational cost. I hope this helps! Respectfully, Mojtaba Maali.
@@CFD_Mojtaba Dear Friend! I would like to know where I can find the actuator disk or line technique for CFD modeling. Are this models in Star-ccm+, what way I can realize it in my simulation? Respectfully yours Maria
@@Maria-73 You can find this option under simulating physics. In STAR-CCM+, it is called Virtual Disk Model. I hope this helps! Respectfully, Mojtaba Maali.
i understood that u are applying sliding mesh on the rotor.. but if we conduct MRF using steady conditions, would the same procedure be applicable for that case?
Thank you for writing! I believe that the use of MRF method requires some modifications to be applied. For instance, it will not be straightforward to define the rotating subdomain inside the stationary subdomain. Consequently, it's not possible to model the Tower effect.
@@CFD_Mojtaba thank you. Yes it has to be modified. Another important question. Why dıd u change rotating part surfaces (the old interface ones) to the symmeyry plane.. because shouldnt we leave them as wall so that interface can be calculated by sliding manner?
@@emregungor2969 the reason why I treated the rotating part surfaces as a symmetry plane is that the configuration of the symmetry plane is much simpler than the wall, but at the end the obtained results shouldn't be different. You will get the same results using these boundary conditions for the rotating part surfaces.
Hi @Didi Widya Utama, Thanks for writing. That is absolutely right. However, why we use this strategy is twofold. First, reducing the computational cost. Further, using the obtained flow behavior to perform the fluid-structure interaction simulations, which are used to assess the structural behavior.
@@CFD_Mojtaba first i was hoping your video explain about how to use DFBI in starccm which i was looking for, since i already using motion before. Anyway you did a great tutorial, thanks
@@DidiWidyaUtama I can tell you that I am working on a tutorial where the DFBI and overset mesh techniques will be covered. This tutorial will be ready in the next few weeks. You can see the outcome of this tutorial in this video in my channel: ruclips.net/video/Gn8Ylk5PRnw/видео.html. In the meantime, I recommend you to subscribe to my channel, this way you will be notified when the aforementioned video is ready.
Hey man I'm trying to simulate a bicycle wheel in starcmm using overset mesh. I'm an absolute beginner and have no idea on how to use the software. Could I apply this tutorial to simulate the wheel? Any help from you would be very much appreciated. Thank you.
Dear Rylan, thank you for writing. In this tutorial, I make no use of overset mesh, instead I employ the Rigid Body Motion. I recommend you to have a look at this tutorial: ruclips.net/video/AZkuHDzSqks/видео.html I hope this was helpful. Respectfully, Mojtaba Maali.
Thanks for your video. It's amazing. I want to know whether the blade tip angle for the used model is 3 degree or not. I want to doublecheck my own geometry file.
Excelente vídeio, me ajudou muito, mais fiquei com dúvidas em relação ao gráfico de resíduos, para considerar que a malha de fato convergiu as equações não deveriam estar abaixai de 10^-3?
Dear Lucca Arnaud, thank you for your interest in this video. It is worthy to note that the residuals fall within an acceptable level at each time step. Another important point is that, normally, in the absence of good residual convergence, greater emphasis is placed on convergence of integral values as force coefficients. I hope this helps! Respectfully, Mojtaba Maali.
Dear Maria, Hello. To create animation, you have two options, either you can export the scalar scene, which shows the wake behind the wind turbine, for later creating animation from the exported images or you can create an animated result using the options available within the STAR-CCM+. For the latter, you need to store the simulation data while the simulation is running. Using the second option will increase significantly the computational cost and you need a relatively large memory space in your computer to save the solution history. Thus, it is recommended to use the first option. Once you have the exported images saved using the first option, you can use any software, such as the Windows Movie Maker to make a video out of the exported images. I hope this helps! Respectfully, Mojtaba Maali.
Hello RADHKRISHNAN PV, Thank you for writing. The angular velocity (rpm) is defined by the user. On the other hand, torque at any blade section is defined as the net aerodynamic force in the plane of rotation times its distance from the center of the rotor. Thus, the moment in the direction normal to the rotor plane is exactly the torque value. To calculate the torque value, all you need to do is create a local coordinate system such that one of its axes is perpendicular to the rotor plane. The moment in the direction of this axis is equal to the torque value. I hope this was helpful. Respectfully, Mojtaba.
Hi sir! Thanks for this tutorial! Is it possible to join the rotor to the Nacelle in these type of simulations? if not, The bending moment and Thrust calculated from simulation will be similar to experiment?! can someone help me pls!
Hi, thank you for writing. It is common to simulate the wind turbine without any physical connection between the rotor and nacelle. This is done in order to decrease both the problem complexity and computational cost. It is belived that adopting such a methodology has a negligible effect on the aerodynamic performance of the wind turbine. I hope this was helpful. Respectfully, Mojtaba.
@@CFD_Mojtaba Thanks Mojtaba, it was quite helpful! Do you know how to monitor velocity fluctuations(u',v',w') in starccm+? I can't find them in field functions and I need them to calculate 2point correlations!
@@MohammadZareian-bp3pr I am not sure if it is possible to monitor the fluctuating velocity components, as in (U)RANS we are concerned with the calculation of the Reynolds stress terms, i.e., the mean product of fluctuating velocity components. I think at most, you can monitor the Reynolds stresses, which are directly accessible if you use the Reynolds stress turbulence models or can be calculated using the Boussinesq hypothesis in case you utilize an eddy viscosity model. I hope this was helpful. Respectfully, Mojtaba.
Thanks a ton sir, really your videos helping me alot, your explanation is amazing, hope u do more videos, I want your help,how to do RTD studies in a column sir using starccm
Thank you for your tutorial. I never used Star-CCM+. This is what I need. Thank you for your video and instruction.
Thank you very much 😃 I would like to see more of these tutorials 😊
Here is a question, why the rotor and nacelle are disconnected in the model, if we want to get the displacement of the nacelle, can this simulation work?
Thank you for your great tutorial video. However I found some "missing links" after 45:32, where you suddenly just jump into the post-processing and I really need to know the details so that I can implement the knowledge into my study. Could you help me find those "missing links"? Thank you.
Dear Salim,
Thank you for your interest in this video. You can watch the video below, which is a more complete version of this: ruclips.net/video/kaCoBw8ynhM/видео.html
@@CFD_Mojtaba Thank you so much sir, it helps me a lot.
I wanted to do a simulation of a floating box with a mooring line attachment using STAR-CCM+ .
Could you explain to me how to model the mooring line in STAR-CCM+?
Thank you for your nice work.
Can you tell me how to make Q-Criterion in a region (not whole calculation domain)?
Thanks!
Hi, thanks for the tutorial. How long does it take to mesh, mine is taking too much time.
The meshing process, on a PC with properties similar to the one I used, shouldn't take more than 30 minutes.
What differences in the physics setup would there be if rotation speed is not specified? For example, if you wanted to calculate how fast the turbine would spin at a given wind speed?
Dear Tony, thank you for writing. If you wanted to calculate the wind turbine rotational speed, you need to use the overset grid, as the sliding mesh technique is not suitable for this case.
I hope this helps!
Respectfully,
Mojtaba Maali.
I have not used overset. Looking forward to it. Will there be differences in continua, or does overset simply not have a rotation value needed?
@@Tony-eg4ic I think the continua will continue the same, for more information on this please have a look at this video: ruclips.net/video/AZkuHDzSqks/видео.html With overset mesh, you can either specify the value of the rotational speed or you can obtain the value of the rotor rotational speed by considering it as a variable.
appreciate your kind share ! could you make tutorial of floating wind turbine with mooring line in Star-ccm+ please ?
Was following the process but after the mesh I couldn’t see the displayer to get the geometry can you help me with that
Please, have a look at this video: ruclips.net/video/kaCoBw8ynhM/видео.html
Thank you so much. Im interesing how to make a wake behind the turbine. You have used volume control under mesh 2, please, tell us how to assign this part?
Dear Maria,
Thank you for your interest in this video. TO understand how to assign a part to a volumetric mesh refinement, I recommend watching this video: ruclips.net/video/AZkuHDzSqks/видео.html
I hope this was helpful.
Respectfully,
Mojtaba Maali.
@@CFD_Mojtaba thank you 😉
I repeated all the steps, but I can't get a wake after turbine, maybe I didn't set up the scene. Can you tell me how to get a wake of a wind turbine?
@@Maria-73 First go to derived parts, isosurface, under scalar select the Q-criterion. Set the isovalue to 5. Select no displayer and then create.
Then right click on scenes, new scene, select scalar. Under displayers, click on outline 1. Uncheck outline. Check surface. Set the color to constant. Under outline 1, set the parts to the wind turbine components. Set the color to a more distinct one.
Change the orientation to -x -z
Now click on scalar 1. Set the Contour style to smooth filled.
Now expand scalar 1. Set parts to isosurface. Set scalar field to velocity magnitude.
Now you can see the wake propagation behind the wind turbine
@@CFD_Mojtaba Thanks a lot, it worked out!!!
Which software it is???
Hello, Dear Friend! Thank you for your vast contribute to wind turine operate in Star-Ccm+ Software. I wonder how to simulate the operation of two or more wind turbines to observe how their wakes affect each other. Do I need set up all steps like in a case of a turbine or exist unevident things to simulate two or more turbines? Respectfully yours Maria
Dear Maria 1973,
Thanks for your comment. You can use the same steps to configure your simulation for multiple wind turbines. However, the only point I would like to mention is about the computational cost as you want to analyze the effects of wake on wind turbine performance. Therefore, I would recommend that you use the actuator disk/line technique for this purpose. That way, you won't have to solve the detailed rotor geometry, which would significantly decrease the computational cost.
I hope this helps!
Respectfully,
Mojtaba Maali.
@@CFD_Mojtaba Thank you so miuch!
@@CFD_Mojtaba Dear Friend! I would like to know where I can find the actuator disk or line technique for CFD modeling. Are this models in Star-ccm+, what way I can realize it in my simulation? Respectfully yours Maria
@@Maria-73 You can find this option under simulating physics. In STAR-CCM+, it is called Virtual Disk Model.
I hope this helps!
Respectfully,
Mojtaba Maali.
mesh continua option is not there, only physics continua option is there, what should i do
Dear Ankit,
Have a look at this tutorial ruclips.net/video/kaCoBw8ynhM/видео.html
hello, Mojtaba, will there be a high-quality 1080p video?
Dear Benjamin Dai,
Thank you for your comment. I will make a higher quality of this video in the near future.
Respectfully,
Mojtaba.
This is great man. Thanks
Wow, I liked it a lot!!
i understood that u are applying sliding mesh on the rotor.. but if we conduct MRF using steady conditions, would the same procedure be applicable for that case?
Thank you for writing! I believe that the use of MRF method requires some modifications to be applied. For instance, it will not be straightforward to define the rotating subdomain inside the stationary subdomain. Consequently, it's not possible to model the Tower effect.
@@CFD_Mojtaba thank you. Yes it has to be modified. Another important question. Why dıd u change rotating part surfaces (the old interface ones) to the symmeyry plane.. because shouldnt we leave them as wall so that interface can be calculated by sliding manner?
@@emregungor2969 the reason why I treated the rotating part surfaces as a symmetry plane is that the configuration of the symmetry plane is much simpler than the wall, but at the end the obtained results shouldn't be different. You will get the same results using these boundary conditions for the rotating part surfaces.
Excellent channel thank you! any chance to see a video explaining shape optimization of the rotor?
Dear Fr,
Thank you for writing! I will consider your comment about making a video on this topic.
Respectfully,
Mojtaba Maali.
Please, where can I get the geometry to download? Sorry, new to CFD
It is available through a link in the description section.
So, the blade is not driven by fluid flow? But driven by rpm you input? Right?
Hi @Didi Widya Utama, Thanks for writing.
That is absolutely right. However, why we use this strategy is twofold. First, reducing the computational cost. Further, using the obtained flow behavior to perform the fluid-structure interaction simulations, which are used to assess the structural behavior.
@@CFD_Mojtaba first i was hoping your video explain about how to use DFBI in starccm which i was looking for, since i already using motion before. Anyway you did a great tutorial, thanks
@@DidiWidyaUtama I can tell you that I am working on a tutorial where the DFBI and overset mesh techniques will be covered. This tutorial will be ready in the next few weeks. You can see the outcome of this tutorial in this video in my channel: ruclips.net/video/Gn8Ylk5PRnw/видео.html. In the meantime, I recommend you to subscribe to my channel, this way you will be notified when the aforementioned video is ready.
Hey man I'm trying to simulate a bicycle wheel in starcmm using overset mesh. I'm an absolute beginner and have no idea on how to use the software. Could I apply this tutorial to simulate the wheel? Any help from you would be very much appreciated. Thank you.
Dear Rylan, thank you for writing. In this tutorial, I make no use of overset mesh, instead I employ the Rigid Body Motion. I recommend you to have a look at this tutorial: ruclips.net/video/AZkuHDzSqks/видео.html
I hope this was helpful.
Respectfully,
Mojtaba Maali.
Thanks for your video. It's amazing. I want to know whether the blade tip angle for the used model is 3 degree or not. I want to doublecheck my own geometry file.
Hi @Chi Ding,Thanks for writing.
The blade tip anlge is 3 degrees.
Regards
Mojtaba.
@@CFD_Mojtaba Thanks a lot.
@@CFD_Mojtaba Hi,Please tell me where I can get the Starccm+ thanks I'm doing some R&D and I need software
Excelente vídeio, me ajudou muito, mais fiquei com dúvidas em relação ao gráfico de resíduos, para considerar que a malha de fato convergiu as equações não deveriam estar abaixai de 10^-3?
Dear Lucca Arnaud, thank you for your interest in this video.
It is worthy to note that the residuals fall within an acceptable level at each time step. Another important point is that, normally, in the absence of good residual convergence, greater emphasis is placed on convergence of integral values as force coefficients.
I hope this helps!
Respectfully,
Mojtaba Maali.
Thank you for making this video!!
pro trick : watch movies at Flixzone. Been using it for watching lots of of movies during the lockdown.
@Jaime Cody Definitely, I have been using Flixzone for since november myself =)
@Jaime Cody Yup, have been watching on Flixzone for since december myself :)
@Jaime Cody definitely, have been using flixzone for years myself :)
@Jaime Cody Definitely, have been using Flixzone for months myself =)
Hello, Dear friend!. Do you know how to create an animation to observe the rotation of the turbine in real time?
Dear Maria, Hello.
To create animation, you have two options, either you can export the scalar scene, which shows the wake behind the wind turbine, for later creating animation from the exported images or you can create an animated result using the options available within the STAR-CCM+. For the latter, you need to store the simulation data while the simulation is running. Using the second option will increase significantly the computational cost and you need a relatively large memory space in your computer to save the solution history. Thus, it is recommended to use the first option. Once you have the exported images saved using the first option, you can use any software, such as the Windows Movie Maker to make a video out of the exported images.
I hope this helps!
Respectfully,
Mojtaba Maali.
@@CFD_Mojtaba thank you for your answer and help!
@@Maria-73 you are welcome!
Hello sir, can you share me the step by step procedure in Star ccm+ to calculate the torque and rpm of a wind turbine?
Hello RADHKRISHNAN PV,
Thank you for writing.
The angular velocity (rpm) is defined by the user. On the other hand, torque at any blade section is defined as the net aerodynamic force in the plane of rotation times its distance from the center of the rotor. Thus, the moment in the direction normal to the rotor plane is exactly the torque value. To calculate the torque value, all you need to do is create a local coordinate system such that one of its axes is perpendicular to the rotor plane. The moment in the direction of this axis is equal to the torque value.
I hope this was helpful.
Respectfully,
Mojtaba.
Hi sir! Thanks for this tutorial! Is it possible to join the rotor to the Nacelle in these type of simulations? if not, The bending moment and Thrust calculated from simulation will be similar to experiment?! can someone help me pls!
Hi, thank you for writing.
It is common to simulate the wind turbine without any physical connection between the rotor and nacelle. This is done in order to decrease both the problem complexity and computational cost. It is belived that adopting such a methodology has a negligible effect on the aerodynamic performance of the wind turbine.
I hope this was helpful.
Respectfully,
Mojtaba.
@@CFD_Mojtaba Thanks Mojtaba, it was quite helpful! Do you know how to monitor velocity fluctuations(u',v',w') in starccm+? I can't find them in field functions and I need them to calculate 2point correlations!
@@MohammadZareian-bp3pr
I am not sure if it is possible to monitor the fluctuating velocity components, as in (U)RANS we are concerned with the calculation of the Reynolds stress terms, i.e., the mean product of fluctuating velocity components. I think at most, you can monitor the Reynolds stresses, which are directly accessible if you use the Reynolds stress turbulence models or can be calculated using the Boussinesq hypothesis in case you utilize an eddy viscosity model.
I hope this was helpful.
Respectfully,
Mojtaba.
Very helpful. thank you
very well-done!!
Hi,Please someone tell me where I can get the Starccm+ thanks
Hi Reza,
please have a look at the Siemens STAR-CCM+ platform: www.plm.automation.siemens.com/global/en/products/simcenter/STAR-CCM.html
Thanks a ton sir, really your videos helping me alot, your explanation is amazing, hope u do more videos, I want your help,how to do RTD studies in a column sir using starccm
Dear Vijaya Pandya,
Thank you for writing! If there's anything else I can help with, please feel free to contact me.
Respectfully,
Mojtaba Maali.
Thank you!!!
Very Good!
WHY UR VOICE SO CUTE DANMIT
Thank you!
thankilarious