In a flow over rotating cylinder simulation, if the cylinder keeps changing its shape with respect to different angular position during rotation. How to specify the shape changes of the cylinder in the transient analysis case?
As far I know, there is no such option to dealing with changing the shape, the only way is to write a proper UDF modeling the simulation.
Ramarajan J. If the motion is prescribed or can be described by formula, than the approach will be no FSI simulation needed.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. 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 work.
take this video as an example: https://youtu.be/pn0J_XSOkds
- Badges
- Science topic