Hi Jessica,
I can’t see any problems with the mesh itself. I have never had a problem generating a surface file from Salome before. I noticed in the results flap.frd that one of the vertices at the top remains zero while the other points do not. Looks like it is accidnetally fixed, but can’t see that in the files. I could not repeat this result by using CalculiX only, which indicates that the .nam files are not the issue.
Is the problem in the figure below repeated with other mapping parameters for this mesh, such as RBF and NN?