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Old   January 29, 2014, 18:09
Default error when writing data
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François Grégoire
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Hi,

Fluent crashes when it tries to write data and I don't know why.
- Windows 8.1
- Ansys 14.5.7
- 3D model with turbulence, combustion, etc.
- Fluent launched in parallel mode and mesh automatically partitioned


Here is the message in the GUI:

Writing "| gzip -2cfv > D:\init.dat.gz"...

999999 (..\src\mpsystem.c@1172): mpt_read: failed: errno = 10054

999999: mpt_read: error: read failed trying to read 32 bytes: No such file or directory
MPI Application rank 0 exited before MPI_Finalize() with status -1073741819
The fl process could not be started.

Error: Error writing "| gzip -2cfv > D:\init.dat.gz".
Error Object: #f

Message from Cortex process==> Connection with host is broken. It may have crashed.


Any idea please??? Thx
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Old   January 29, 2014, 20:59
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Ghazlani M. Ali
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it says no such file or directory ? is the d: and external hard drive ? may be it's unplugged ?
Have you tried another location ?
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Old   January 29, 2014, 23:26
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No, I run a dummy test case with the same commands, same udf, and everything works fine.

It just doesn't work with my big model, although my model is not that big with 250000 cells and 10-12 variables.

It's very annoying and I read all kinds of half-answers going in every directions online... Confused and don't know what to do except lighten my model step-by-step and going by elimination.
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Old   January 29, 2014, 23:31
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same problem in that thread, what the hell am I supposed to do with answer #2...?: parallel cfd
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Old   January 30, 2014, 12:24
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he is refering to the type of MPI, when you launch FLUENT you get the right to choose in the parallel setting from diferrent king of mpi: pcmpi, intel...
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Old   January 30, 2014, 12:32
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I always use pcmpi on Colosse, and you? If I use another mpi there is a message that recommends using pcmpi instead, somewhere in the output files..

From reading around, I think it has to do with the mesh partitioning. I added a line in my .jou telling Fluent to partition with another method than the default Metis. I'll see if it works.

I also read that it may be good to modify/save the case in serial, then launch it in parallel, for some obscure reasons...
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Old   January 30, 2014, 12:39
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[QUOTEI always use pcmpi on Colosse, and you?][/QUOTE]
me too.
Did you get this error message on colosse or you desktop ?
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Old   January 30, 2014, 12:43
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both, local and Colosse
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Old   February 3, 2014, 16:23
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In the end, it looks like the default 'Metis' mesh partitioning method was causing some data communication problems. I changed the partitioning method to 'Cartesian Axes' and the write-data doesn't cause me headaches anymore.

Couples of hours lost on that!
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