Hi everyone,
I am working on an incompressible wind simulation of a 3D city model (SAAO site in Cape Town). My geometry is a STEP file consisting of 27 Solid Bodies (26 buildings and 1 terrain volume) with a total of 5,896 faces.
I am trying to assign all building and terrain surfaces to a Wall boundary condition. However, I am running into a persistent issue where I cannot select the faces without the selection also grabbing the Volumes (Solid Bodies).
When a Volume is accidentally included in the assignment list, I receive the error: “The physics cannot be taken into account as the simulation setup is not valid… Missing material or advanced concepts were detected for the following entities.”
My current workflow:
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I have used Facet Split on the terrain to access the triangles.
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I have tried toggling the Face Selection filter on and the Volume Selection filter off.
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Despite the filter, the assignment list in the Boundary Condition panel still shows the parent Solid Bodies (Open CASCADE STEP translator entities) instead of just the face IDs.
Questions:
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Is there a way to “Lock” Volume selection so that a box-select (Ctrl+A) only picks up the 5,896 faces?
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If the terrain is a solid “chunk” (skirted), do I need to extract the top surface specifically to avoid assigning the internal “solid” to the Wall condition?
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Is there a “Select all exposed faces” shortcut that ignores internal solid volumes?
Project Link: [SAAO: wind and heat]
Thanks for the help!