Learning Forum

[Dubey92]

I am running a solidification/melting simulation with "Non-Iterative Time Advancement" with fixed time step method. I am running it on a Linux cluster with multiple cores. The simulation runs fine for first some time steps but then stops with the error:

DF5-DIAG: Error detected in HDF5 (1.10.5) MPI-process 0:

#000: H5F.c line 444 in H5Fcreate(): unable to create file

major: File accessibilty

minor: Unable to open file

#001: H5Fint.c line 1509 in H5F_open(): unable to open file: time = Sat Jan 7 13:09:29 2023

, name = 'D:PowderParticlesSLM - SmallParticleBed_filesdp0FFFFluentFFF.1.gz-2-01000.dat.h5', tent_flags = 13

major: File accessibilty

minor: Unable to open file

#002: H5FD.c line 734 in H5FD_open(): open failed

major: Virtual File Layer

minor: Unable to initialize object

#003: H5FDsec2.c line 346 in H5FD_sec2_open(): unable to open file: name = 'D:PowderParticlesSLM - SmallParticleBed_filesdp0FFFFluentFFF.1.gz-2-01000.dat.h5', errno = 24, error message = 'Too many open files', flags = 13, o_flags = 242

major: File accessibilty

minor: Unable to open file

 

Error at Node 0: HDF Error occurred! at IO/Hdf/src/HdfFile_impl.hpp:151 during a call to HDF5 library function H5Fcreate

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

0: mpt_accept: error: accept failed: Too many open files

 

Same simulation runs fine when I run it on a windows work station.

Any help is much appreciated. Thanks

[DrAmine]

Probably missing libraries or Access violation. Which Linux OS are you utilizing? Which Ansys Version? 

 

Refer to this  2.1. Required Linux Libraries by Product (ansys.com) to check any missing libraries.

[Dubey92]

Hi DrAmine. Thanks for your reply. I am using ANSYS 2020R2 on Ubuntu 20.04. I made some changes in the boundary conditions and it worked. But I am not sure if it will work always and there is some other issue.

[Rob]

To add, the h5 format can fail due to parallel hardware issues. If you switch the file I/O in preferences to legacy it'll revert to .dat.gz which is slower but can be more stable. 

[Dubey92]

Thanks for your input Rob.