# Calculated torque value not matching with fluent value

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 December 6, 2020, 07:53 Calculated torque value not matching with fluent value #1 New Member   Jahaan Join Date: Dec 2020 Posts: 4 Rep Power: 5 Hi everyone I am a student, recently gained intrest in CFD and started working on small cases to learn and understand tool and physics. I have been working on a simple case of "transient simulation, Flow over a rotating circle -2D". I am using pressure inlet and outlet as boundry conditions, with constant RPM. My challenge is i am not able to match calculated torque value and fluent torque value. Also I have observed that torque value is changing with time even tough with constant RPM Need help to figure out my case. Thanks in advance

 December 6, 2020, 19:42 #2 Senior Member   Join Date: Nov 2013 Posts: 1,965 Rep Power: 26 If you want help, you have to share some more details. At minimum: -which pressures and flow rate did you use? -what is the torque value calculated by you? -how did you calculate that? -what is the torque value calculated by fluent?

 December 10, 2020, 11:03 #3 New Member   Jahaan Join Date: Dec 2020 Posts: 4 Rep Power: 5 Hi Pakk, Thanks for your reply, my apologies for not giving complete information. I have used simple model of (R)0.07m circle in a rectangular domain, Circle rotating with 1780.23 rad/sec. I have used KOmega solver with boundry condition (Pressure inlet and pressure outlet) in transient case and ran for 4 sec, ANSYS torque value is 19Nm. I have theoretically calculated torque value by (Moment of inertia of circle (I) X Angular acceleration (Alpha)) and the derived value is 0.008Nm. I am not able to understand where i am going wrong. Thanks for asking me :-)

 Tags flow over a cylinder, fluent, torque, transient

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