I don't know why neither. Meshing the tank model with Netgen give me empty results as well.
I can't help you neither about this point.
I used Gmsh and got the result even though I had the error message Gmsh error: Unknown element type for UNV export (MSH type 15) which as already been raised in this forum.
activate the report view and read the output ...
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... Pressure on shell mesh at the moment only supported for meshes with appropriate group data. ...