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Why my 3D 1DOF overset mesh wont give any rotation? |
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August 24, 2022, 13:18 |
Why my 3D 1DOF overset mesh wont give any rotation?
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#1 |
New Member
aykay
Join Date: Dec 2021
Posts: 5
Rep Power: 5 |
Hi, I have a fan enclosed in 3D overset mesh domain. I wish to calculate (1DOF free rotation) RPM (rotation/min) of the fan in response to an incoming flow with M = 2.16, angle of attack = 0. There are four deflected flat plates approximately 0.7 meters away from the fan. I want to study the effects of the flow disturbance caused by these flat plates on the RPM of the fan (which I want to calculate through 1DOF free-rotation). MOI of the fan is 0.001 kg/m2.
The case fully converges at 0.4s with e-4 time-step. Though I slightly see some movement in fan geometry (about 1degree) but my overset mesh just wont rotate fully and record any roll angle/ roll moment. . according to reference papers, I should be getting 4 full rotation cycles by this flow-time. What I may be doing wrong? |
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August 24, 2022, 19:09 |
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#2 |
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 |
never did same simulation, but:
why should mesh rotates? mesh doesn't know its a fan I feel like you should apply force somehow (for example through UDF) as it seems, that its not applied automatically.
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August 24, 2022, 19:26 |
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#3 | |
New Member
aykay
Join Date: Dec 2021
Posts: 5
Rep Power: 5 |
Quote:
The mesh should rotate because of the angled airflow coming from the deflected plates that I have placed in front of the fan. Just like how water flow rotates the blades of a turbine I wish to calculate RPM of the free-rotating fan. Instead of using a UDF, I have setup the same rotating domain using 1DOF dynamic mesh motion for the overset (fan) zone. |
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Tags |
1dof, fan, overset mesh, roll motion, rotation rate |
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