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UDF to define the motion of vanes in an air motor

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Old   September 30, 2017, 07:07
Post UDF to define the motion of vanes in an air motor
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Lalith Muralikrishnan
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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
Attached Images
File Type: jpg overall_mesh.JPG (70.2 KB, 3 views)
File Type: jpg mesh at vanes.JPG (150.7 KB, 1 views)
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