CFD Simulation Software

GMCobraz · May 16, 2014, 05:12

Hi everyone. I want to ask whether is it necessary to remove all fillets for CAD model before run the simulation?
Is it possible to get the mass flow rate or volume flow rate from the simulation itself?
Thank you.

vijaymali · May 16, 2014, 08:54

Hi,

What features of CAD model you keep and what you delete depends on the physics you want to capture. If that feature governs the physics, you keep it else you delete it.

Fillet is also one of such feature. Sometimes its very important to govern the flow. So in those cases we keep it. When in comes to majority of industrial cases, fillets are very small features compared to total dimensions of the geometry. So most of the cases, we remove the fillet.

One more points is that even you keep the fillet, you need to have mesh resolution such that the curvature of fillet is correctly captured.

It is definitely possible to get mass flow rate or volume flow rate from CFD simulation. In those cases, you need to know the pressure values at inlet and out.

Could you please share specific details about your problem so that I can give specific answers.

Thanks
Vijay
www.learncax.com

GMCobraz · May 17, 2014, 08:56

Thank you Vijay.
I am the beginner of CFD.
I would like to simulate a rotating fan with CFD to check with the mass flow rate at the outlet.
I get the fan model from grabcad.com but I can't upload here.

vijaymali · May 17, 2014, 11:00

In this case, you may need to remove the fillets as that usually what we do during fan simulation. They may not be important. But remember to keep fillets for blades as physics is really strong around the blades.

As you have mentioned that you are beginner in CFD, fan simulation is bit complex to start with. I hope that you have planed for required learning. Fan simulations would need MRF (multiple reference frame, sometimes also called as moving reference frame) approach.

Have you planned which software you are going to use for simulation?
Although you can do this simulation in any CFD software, I would suggest you to go for ANSYS CFX as thats what mainly turbo machinery industry.

Thanks
Vijay
www.learncax.com

GMCobraz · May 17, 2014, 11:10

Thank you Vijay.
I would like to learn CFD.
Can you please give me a direction where should I start through learning CFD?
Is it I need to start from simple model like pipe flow before jump to rotating simulation?
Thank you very much for your information.

vijaymali · May 17, 2014, 11:25

Hi,

For complete beginner, I would suggest to go for some beginner level course. That course would give you a start point. We do offer lot of CFD course starting for beginner to advance level.

Following are few course you can go thorough:

1) https://learncax.com/index.php/en/co...-fluent-detail
2) https://learncax.com/index.php/en/co...sys-cfx-detail
3) https://learncax.com/index.php/en/co...chinery-detail

Let me know if you need any specific information about the course so that I can guide you the support team.

Thanks
Vijay
www.learncax.com

May 16, 2014, 05:12	CFD Simulation Software	#1
GMCobraz New Member Join Date: May 2014 Location: Malaysia Posts: 4 Rep Power: 12	Hi everyone. I want to ask whether is it necessary to remove all fillets for CAD model before run the simulation? Is it possible to get the mass flow rate or volume flow rate from the simulation itself? Thank you.

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May 16, 2014, 08:54		#2
vijaymali New Member Vijay Mali Join Date: Apr 2014 Location: India Posts: 18 Rep Power: 12	Hi, What features of CAD model you keep and what you delete depends on the physics you want to capture. If that feature governs the physics, you keep it else you delete it. Fillet is also one of such feature. Sometimes its very important to govern the flow. So in those cases we keep it. When in comes to majority of industrial cases, fillets are very small features compared to total dimensions of the geometry. So most of the cases, we remove the fillet. One more points is that even you keep the fillet, you need to have mesh resolution such that the curvature of fillet is correctly captured. It is definitely possible to get mass flow rate or volume flow rate from CFD simulation. In those cases, you need to know the pressure values at inlet and out. Could you please share specific details about your problem so that I can give specific answers. Thanks Vijay www.learncax.com

May 17, 2014, 08:56		#3
GMCobraz New Member Join Date: May 2014 Location: Malaysia Posts: 4 Rep Power: 12	Thank you Vijay. I am the beginner of CFD. I would like to simulate a rotating fan with CFD to check with the mass flow rate at the outlet. I get the fan model from grabcad.com but I can't upload here.

May 17, 2014, 11:00		#4
vijaymali New Member Vijay Mali Join Date: Apr 2014 Location: India Posts: 18 Rep Power: 12	In this case, you may need to remove the fillets as that usually what we do during fan simulation. They may not be important. But remember to keep fillets for blades as physics is really strong around the blades. As you have mentioned that you are beginner in CFD, fan simulation is bit complex to start with. I hope that you have planed for required learning. Fan simulations would need MRF (multiple reference frame, sometimes also called as moving reference frame) approach. Have you planned which software you are going to use for simulation? Although you can do this simulation in any CFD software, I would suggest you to go for ANSYS CFX as thats what mainly turbo machinery industry. Thanks Vijay www.learncax.com

May 17, 2014, 11:10		#5
GMCobraz New Member Join Date: May 2014 Location: Malaysia Posts: 4 Rep Power: 12	Thank you Vijay. I would like to learn CFD. Can you please give me a direction where should I start through learning CFD? Is it I need to start from simple model like pipe flow before jump to rotating simulation? Thank you very much for your information.

May 17, 2014, 11:25		#6
vijaymali New Member Vijay Mali Join Date: Apr 2014 Location: India Posts: 18 Rep Power: 12	Hi, For complete beginner, I would suggest to go for some beginner level course. That course would give you a start point. We do offer lot of CFD course starting for beginner to advance level. Following are few course you can go thorough: 1) https://learncax.com/index.php/en/co...-fluent-detail 2) https://learncax.com/index.php/en/co...sys-cfx-detail 3) https://learncax.com/index.php/en/co...chinery-detail Let me know if you need any specific information about the course so that I can guide you the support team. Thanks Vijay www.learncax.com