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UDF to define the motion of vanes in an air motor |
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September 30, 2017, 08:07 |
UDF to define the motion of vanes in an air motor
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Lalith Muralikrishnan
Join Date: Sep 2017
Posts: 1
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Hi,
I am trying create a CFD model of a vane type air motor which rotates when the pressure is applied at the inlet. I am trying to use the dynamic meshing option in fluent in my model. The interior part is defined as a deforming mesh. The rotor and the passive mesh along the rotor is defined as the rigid body motion and is free to rotate in z axis. I have used the following UDF code to define this, #include "udf.h" #include "math.h" DEFINE_SDOF_PROPERTIES(rotor,prop,dt,time,dtime) { prop[SDOF_MASS] = 0.187; prop[SDOF_IZZ] = 55890.50 ; prop[SDOF_ZERO_TRANS_X]=TRUE; prop[SDOF_ZERO_TRANS_Y]=TRUE; prop[SDOF_ZERO_TRANS_Z]=TRUE; prop[SDOF_ZERO_ROT_X]=TRUE; prop[SDOF_ZERO_ROT_Y]=TRUE; prop[SDOF_ZERO_ROT_Z]=FALSE; } Now I am not sure how I should define the motion of the vanes and the passive layer of mesh around the vanes. It should rotate freely about the z axis, and have the same centre of rotation as the rotor, but should also be simultaneously be in contact with the stator walls. So setting the rotational degree of motion about z axis is not enough, but the profile of the CG motion should also be specified for the vanes. I dont know how to enable both SDOF motion and specify CG motion in fluent. Any ideas on how should proceed on this further? Or am I approaching at this in a wrong way? Any inputs on my approach will also be much helpful I am attaching the pictures of the mesh for your reference. Thanks in advance. Regards, Lalith |
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