Thank you very much sir, one more question to be sure, If I wanna tell fluent that the angular velocity of the turbine is a function of the wind velocity and I use the attached udf function in the mesh motion option, will fluent understand this without the 6dof? Thanks and check out the file please...
With 6DOF velocities are calculated from the force balance, with UDF are imposed.
Franco
As for sliding mesh and its constant velocity - it depends on how you write your UDF function. If you know the rotor's moment of inertia and you can read the axial moment integrated from the pressure distribution on the surface of rotor, then you can write down a "1-D motion simulator", that will work exactly as the SDOF function in this case. The rotational velocity will change in time until the rotor achieves the balance. Pros: the size of mesh does not change, no time consuming remeshing, no problems with boundary layer. Cons: errors in flowfield on the interfaces, you have to move them away from the turbine rotor, but not too far, because of the ground distance and the "tip mesh velocity". Probably the overlapping mesh (ANSYS 18) does not have such problems.
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