Hi Peter, I’m not sure I fully understand. I’m actually also adding the free stream static pressure to get p in that formula, since I know it from ISA tables, so I’m not using a pressure difference as you seem to be talking about. When I run ANSYS without changing any signs, the following deformation, which is unphysical:
As can be seen, the skin is not transferring the pressure load to the ribs and the spars, but treating those as boundaries to deform through. If I don't add the static freestream pressure, as you suggest I do, I get this result:
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