[Nek5000-users] Seg. fault in running a backward facing step case.

[nek5000-users at lists.mcs.anl.gov]

Hello,

I am trying to simulate flow in a 3D backward facing step (BFS) geometry.

I have attached the *.box file and n2to3.in file that I use to create the
3D geometry. For reference logfile, *.rea and *.usr files are attached.
The code is compiled with GNU compiler and OpenMPI. The code is compiled
for 16 processors and compiler.out file is attached as well.

When I run the code, I get a seg. fault. After running the "gdb" tool on
the core.* file, I get the following output. I have attached the gdb
output file too.
===========================================================================
Core was generated by `./nek5000'.
Program terminated with signal 11, Segmentation fault.
[New process 7652]
#0  0x0000000000488768 in chcopy_ ()
===========================================================================

3D BFS geometry has a wall at the bottom and symmetry b.c. at the top. But
if I change the top b.c. with wall the simulation works. For reference I
have attached the job output file.

Initially, I thought the problem was with memory limitations on my cluster
for a bigger geometry. So I tried a smaller geometry, but I still kept
getting seg. faults.

Help with solving this problem will be greatly appreciated. And sorry for
attaching so many files.

Thanks,

Harish.
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