Hi I think there is a inconsistency between gmsh documentation and output msh file. In the documentation the node ordering for hexahedron is such that the ordering initially goes in positive x, y, z directions. In other words, it starts from 0 and goes to 1 which makes a vector in positive x (or u) direction. But in the msh file attached the cells don't obey this convention.
Best, Orhan
rect.msh
Description: Mesh model
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