Hi dear friends,
I want to simulation a whirl rotational motion and axial distance together in Ansys Fluent or Ansys CFX . For this work, Should I work on dynamic mesh and write UDF? or Is there other way?
In fact, I want to simulate a rotational spherical body in fluid. This body rotates and has a whirl rotational motion and axial displacement together. FSI(Fluid Structure Interaction) simulation can use in this work?
Thank, I am grateful that guide me.
Hi,
the first question (not answered by the text of your question) is, whether the motion of this rotational spherical body is caused and only determined by the action of fluid forces or whether this body motion is prescribed in some way.
If the motion is prescribed or can be described by formula, than the approach could be:
1) no FSI simulation needed
2) for purely the rotational motion it would be sufficient to assign the calculated surface velocity as a boundary condition to the walls of the rotational spherical body.
3) For the additional axial displacement, the body real needs to be displaced with regard to the originally generated mesh and this could be accomplished by mesh morphing (in CFX) or the so-called "moving-deforming mesh" algorithm in Fluent.
In contrary, if the rotational spherical body can freely move in the fluid under the influence of acting hydrodynamic forces, then a description of the body motion is not possible by simple formula. In this case not a FSI, but a 6DOF (6-degree-of-freedom) simulation would be required. The body itself is not deformable, I assume. So its motion can be described as the motion of a rigid body under the influence of the acting hydrodynamical force and moment on its center of mass. Combining 6DOF with moving-deforming mesh would then do the trick.
Only if the body could deform its shape under the influence of acting hydrodynamical forces, then a FSI would be required.
With best regards,
Dr. Th. Frank.
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