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The manual at the following URL has an item on "outflow_type".
https://2022.help.altair.com/2022.3/hwcfdsolvers/acusolve/topics/acusolve/simple_boundary_condition_acusolve_com_ref.htm
Please tell me how to set outflow_type in HyperWorks CFD.
That outflow_type specification is not available in the GUI. You would need to add that to the input file manually before solving. Out of curiosity - what sorts of cases are you running where the default