Learning Forum

[jimbo]

Currently simulating the fluid-structure interaction of the flow channel flap, the fluid domain uses triangles to cut the mesh 2mm for analysis; the structure domain uses Multzone to divide 1mm for analysis, the material uses flexible material, and the flap and flow channel surface use Refinemet to refine the mesh. Several errors occurred when exporting to the external SYSTEM COUPLING
1. Solid mesh elements are severely distorted
2. The displacement of the coupled flap is not large, and there is no obvious deflection behavior when using ANIMATION observation
Could you please provide some solutions to solve the above problems about mesh and structure not being able to perform flexible behavior smoothly?

The following are my simulation parameters. If you need other parameters, please let me know.

[Rahul]

Is this a transient simulation? If yes, try using the smaller values for the time step.

As it is failing with a distorted mesh, check if Fluent is sending unreasonable forces to Mechanical, which is causing elements to distort. 

You can also try using the underrelaxation on data transfer.

[jimbo]

Yes, that's right. This is a transient simulation. I use a time step of 0.01. I don't know if it is short enough. I want to know how to use underrelaxation on data transfer from FLUENT to MECHANICAL. Can it provide the modified position? In FLUENT or STRUCTURAL?

[Rahul]

Please refer Data Transfer Relaxation