CGNS mesh import failure

General
1

Hi,

I would like a test a small test case with 3D model using PyFR.
I am basically extending the cylinder model with 3D dimension.
And also instead of the cylinder I have put the sphere.

I have now with me .cgns tet mesh, but when I try to convert it,
I am getting following error.

(root) tegner-login-1$ pyfr import inc_cylinder_3d.cgns inc_cylinder_3d.pyfrm

Traceback (most recent call last):
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/ctypesutil.py", line 32, in load_library
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/ctypes/__init__.py", line 348, in __init__
self._handle = _dlopen(self._name, mode)
OSError: libcgns.so: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/bin/pyfr", line 11, in <module>
load_entry_point('pyfr==1.7.0', 'console_scripts', 'pyfr')()
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/__main__.py", line 110, in main
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/__main__.py", line 121, in process_import
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/__init__.py", line 19, in get_reader_by_extn
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 374, in __init__
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 34, in __init__
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/ctypesutil.py", line 41, in load_library
OSError: Unable to load cgns

Could you please tell me what I am doing wrong.

Kind regards,
Mathi

2

Hi Mathi,

export PYFR_LIBRARY_PATH=(your CGNS library path)

Here is a thread about CGNS

Cheers,

Niki

3

Hi Niki,

Thanks!

Still I am getting some error.

(root) tegner-login-1$ pyfr import inc_cylinder_3d.cgns inc_cylinder_3d.pyfrm

Traceback (most recent call last):
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/bin/pyfr", line 11, in <module>
load_entry_point('pyfr==1.7.0', 'console_scripts', 'pyfr')()
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/__main__.py", line 110, in main
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/__main__.py", line 121, in process_import
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/__init__.py", line 19, in get_reader_by_extn
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 384, in __init__
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 272, in __init__
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 308, in _read_bc
File "/cfs/klemming/nobackup/g/gongjing/tegner/anacond3/4.4.0/lib/python3.6/site-packages/pyfr-1.7.0-py3.6.egg/pyfr/readers/cgns.py", line 206, in boco_read
RuntimeError: Only element range BC is supported

Could you please let me solve this issue.

Thanks,
Mathi

4

Hi Mathi,

I know very little about the CGNS format. However, this error has already been discussed on the mailing list

.

Jin Seok wrote:

“The CGNS reader of PyFR can deal with boundary condition associated with element, not node”.

Cheers,
Niki

5

It is planned that in future releases of PyFR CGNS mesh formats will not be supported.