Quad surface mesh import fail

General
1

When I import .msh to .pyfrm , I got typeError

image
image815×328 139 KB

how can i do?
i made mesh file by pointwise V18.0R3
when i use only triangular surface mesh, it didn’t appeared.
but i use tri+quad mesh, it suddenly appeared…

case2.msh
case2.pw
quad.ini

2

I downloaded and tried importing your mesh, I got a slightly different message that makes more sense.

Traceback (most recent call last):
  File "/Users/wtrojak/Documents/code/pyfr_venv/bin/pyfr", line 33, in <module>
    sys.exit(load_entry_point('pyfr==1.12.3', 'console_scripts', 'pyfr')())
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/__main__.py", line 117, in main
    args.process(args)
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/__main__.py", line 131, in process_import
    mesh = reader.to_pyfrm(args.lintol)
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/readers/base.py", line 23, in to_pyfrm
    mesh = self._to_raw_pyfrm(lintol)
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/readers/gmsh.py", line 414, in _to_raw_pyfrm
    rawm.update(mesh.get_connectivity())
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/readers/base.py", line 176, in get_connectivity
    eles = self._to_first_order(self._elenodes)
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/readers/base.py", line 82, in _to_first_order
    self._check_pyr_parallelogram(foelemap[petype, epent])
  File "/opt/homebrew/lib/python3.9/site-packages/pyfr/readers/base.py", line 66, in _check_pyr_parallelogram
    raise ValueError('Pyramids with non-parallelogram bases are '
ValueError: Pyramids with non-parallelogram bases are currently unsupported

You appear to have some pyramids in your mesh that don’t have parallelogram bases.

3

Then… In this situation, I can’t import my .msh file to pyfrm.
Is it the only way to create a grid in another way?
Can you suggest me some alternatives?

4

So I guess you are using quads on the surface of some curved geometry? What you may be able to do it extrude those to produce a layer of hexahedral elements. I think you can then use farfield in Pointwise to help prevent the quad bases for the pyramids from being anything other than parallelograms. However, I haven’t used this procedure before and it will be dependent on your geometry.

In this post we discussed Pyramids extensively: Errors on mesh with pyramid elements

5

Otherwise, you can just stick to using triangles on the surface.