Learning Forum

[Saeed]

Hello,

 

I want know if it is possible to do ANSYS fluent - Rocky DEM coupling  with HPC ?

[Rob]

It is. However, you need to exercise some care in how you use the nodes and set up the coupling. Please provide more details on your cluster, but also check that you can manually check and assign where jobs go. 

[Saeed]

Thank you for your answer, our HPC cluster currently comprises over 23,000 cores, spread among 400 nodes, with two CPUs per node.

 

Also, I want use dynamic mesh for my simulation, is rocky Comaptible with dynamic mesh ?

 

Thanks 

[Rob]

The compatability will be covered in the documentation. Sliding mesh is fine, but remeshing may cause problems. https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v241/en/dem_cfd_coupling/section-limitations-twoway.html

If you can specify which cores you use rather than launching into a blind queue you should be OK. If you don't know where the processes are you may have a problem as Rocky needs to know where the Fluent process is. 

 

[Saeed]

our HPC members tried to install rocky on our hpc on fot the following error. can you please help us with it:

It looks like Rocky will not work with 2023R2 nor 2024R1 due to our Red Hat 8.8 Operating System glibc version:

Rocky
Traceback (most recent call last):
  File "/home/jenkins/Work/miniconda/envs/_rocky30-freeze-linux64-py36-v3/lib/python3.6/site-packages/cx_Freeze/initscripts/__startup__.py", line 14, in run
  File "/home/jenkins/Work/miniconda/envs/_rocky30-freeze-linux64-py36-v3/lib/python3.6/site-packages/cx_Freeze/initscripts/Console.py", line 26, in run
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/main.py", line 13, in 
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/rocky30/frozen_utils.py", line 70, in RockyBasedAppMain
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/etk/plugins10/source/python/plugins10/plugins/basic_application/main.py", line 264, in Main
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/etk/plugins10/source/python/plugins10/plugins/basic_application/main.py", line 415, in _Main
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/rocky30/rocky_application_setup.py", line 63, in RegisterPlugins
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/rocky30/rocky_application_setup.py", line 111, in RegisterPlugins
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/rocky30/plugin_registry.py", line 170, in register_plugins
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/kraken20/source/python/kraken20/main.py", line 78, in ImportQWebEngineModules
  File "/home/jenkins/Work/Jenkins/workspace/rocky30-rb-ROCKY-v23.2.0-ansys-newlinux/rocky30/source/python/rocky30/_cx_freeze_vtk9_hack.py", line 18, in import_hook_wrapper
  File "ExtensionLoader_PyQt5_QtWebEngineWidgets.py", line 22, in 
  File "ExtensionLoader_PyQt5_QtWebEngineWidgets.py", line 14, in __bootstrap__
  File "/home/jenkins/Work/miniconda/envs/_rocky30-freeze-linux64-py36-v3/lib/python3.6/imp.py", line 343, in load_dynamic
ImportError: /gpfs/sharedfs1/admin/hpc2.0/apps/ansys/2023R2/v232/Electronics/Linux64/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /gpfs/sharedfs1/admin/hpc2.0/apps/ansys/2023R2/v232/rocky/bin/lib/python3.6/../../libQt5WebEngineCore.so.5)

Both Rocky versions are looking for GLIBCXX_3.4.26, but unfortunately we only have up toGLIBCXX_3.4.25' with our current glibc system version installed on our systems.