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[FAQ]

If a mesh has patches (boundaries, interfaces, etc.) with many face sets, the ANSYS CFX Solver can crash at the beginning of the simulation or in the first time step with a message “return code 9” and no further information in the .out File is available. A face set is anything that can be accessed separately in the mesh, e.g., a mesh region. ANSYS CFX keeps all these face sets instead of combining them into the boundaries, interfaces, etc. that are really used. This leads to higher demand on a Catalogue Size. The Catalogue Size can be increased on the command line for example with -size-cat 2x and in the ANSYS CFX Solver Manger with : SOLVER STEP CONTROL: Runtime Priority = Standard MEMORY CONTROL: Catalogue Size Override = 2x END END Please consider that there is ongoing development work for the improvement of the solver behavior in such cases.