Torque value obtained from ANYSYS Fluent is for wall or air around the wall

Jahaan · December 27, 2020, 03:35

Hi Everyone,

I have a small question.

I have been doing a 2D simulation of flow over a rotating cylinder (Wall). i have used K-Omega solver with derived Y+ values and ran the simulation. I am confused from the derived torque value through Post processing window of Fluent "Reports → Forces → Moments → Select Wall → Print" .

Please advice the derived torque value is of the air rotating over the cylinder OR it is only of Cylinder.

Please share me a good reference to relate my scenario.

Please see the attached images for quick references.

thanks in advance

pakk · December 28, 2020, 13:54

Stupid question maybe, but aren't they the same?

Jahaan · December 31, 2020, 00:08

Firstly thanks for your reply.

I am bit skeptical about it, if both are same then theoretically calculated torque values of rotating cylinder and the ANSYS torque values of rotating wall are different.

Being a senior member of this page, It will be good if you can be helpful, instead of saying it a stupid question.
I am just starting my self with CFD, trying to explore things out and reaching for help. I would be more happy if i get any help, where i would like to correct myself.

pakk · December 31, 2020, 18:42

I didn't mean to say that your question is stupid, I meant that my question might be stupid.

December 31, 2020, 00:08		#3
Jahaan New Member Jahaan Join Date: Dec 2020 Posts: 4 Rep Power: 5	Firstly thanks for your reply. I am bit skeptical about it, if both are same then theoretically calculated torque values of rotating cylinder and the ANSYS torque values of rotating wall are different. Being a senior member of this page, It will be good if you can be helpful, instead of saying it a stupid question. I am just starting my self with CFD, trying to explore things out and reaching for help. I would be more happy if i get any help, where i would like to correct myself. Last edited by Jahaan; December 31, 2020 at 02:54.

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December 28, 2020, 13:54		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	Stupid question maybe, but aren't they the same?

December 31, 2020, 18:42		#4
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	I didn't mean to say that your question is stupid, I meant that my question might be stupid.