When preparing an ANSYS Fluent mesh for two-way Fluid-Structure Interaction (FSI) coupled with ANSYS Mechanical, clicking Check Mesh may trigger the following warning and cause the mesh validation to fail:
Context: ANSYS Fluent mesh validation • Dynamic Mesh • Boundary Conditions
WARNING: Unassigned interface zone detected for interface 6.
WARNING: Mesh check failed.
To get more detailed information about the mesh check failure,
increase the mesh check verbosity via the TUI command /mesh/check-verbosity.Root Cause & Solution
This error occurs when the boundary condition type for the FSI surface is set to Interface rather than Wall.
- In Fluent, the boundary type
Interfaceis exclusively reserved for grid interface pairs (such as sliding meshes or non-conformal meshes joined viaMesh Interfaces). - For an FSI coupling surface where fluid interacts with a solid structure, the boundary condition type must be set to
Wall. - Under the Dynamic Mesh panel, designate this Wall as a dynamic boundary zone and assign it to System Coupling.
Once changed from Interface to Wall, re-running Check Mesh passes cleanly with zero warnings.
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