Learning Forum

[larito]

Hello,

I am running my first FSI case in Ansys with the help of the Ansys docs: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_fsi_sec_setup.html

I did everything as said, I run the solution the first time as indicated with no issue but the moment I set the coupling option and try to run the simulation I gt the following error "Update-Dynamic-Mesh failed. Negative cell volume detected" My mesh quality seems fine as seen on the left part of the image bellow.

As part of a possible solution I changed the mesh acouple of time and decreased the time step(0.0001) but non of these tricks worked.

I have no idea what is causing this issue, any help on this or advice is much appreciated.

Thank you

 

[Essence]

Hello,

You need to change the settings and additional dynamic mesh zones (eg: maybe boundary zones) need to be defined. You might find more information here: 11.6. Using Dynamic Meshes (ansys.com)  44.6. FSI Setup Recommendations for Fluent-Mechanical Couplings (ansys.com)