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Hello, I am trying to run a CFD on a model in VWT in order to eventually extract the pressure on the surfaces to place them as node pressures on the same model in optistruct. Currently I am having problems getting VWT to run successfully. I have been through the troubleshooting webpage (http://forum.altairhyperworks.com/index.php?/topic/13776-workflow-for-virtual-wind-tunnel/&tab=comments#comment-20229). The Run parameters I am using are: The vwtAnalysis VOUT file is as follows: The vwtAnalysis MeshSim file is as follows: This suggests there is an error in line 65 but i do not know what this means. I am not getting a mesh intersection file if I intersect the model with the wind tunnel boundary. However, I obtain a CAD.DIR but not a MESHSIM.DIR the output folder. The link to the Nastran file: I hope you can help.