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A question about setting up a Fluent case on Windows and transferring to HPC

    • mkhademi
      Subscriber

      Hello,

      I have setup a case and data file of Fluent on Windows machine, and I started Fluent in parallel mode with 10 CPU on my local machine. Then, I transfer this case and data file to a cluster and ask the HPC to run it with 72 processor with syntax fluent 3ddp -t72

      My question is in this case when case and data file are read from the journal file, Fluent will be run on 72 cores or the same 10 cores for which the case and data file were developed on the local machine.

      Thank you so much.

       

    • Rob
      Ansys Employee

      The case and data will be split over the number of cores in the new session, so assuming you do launch 72 cores you should see a message in the transcript about re-partitioning from 10 to 72.  Double check where any saved monitors are going, and also if you have UDFs these may need to be recompiled if moving from Win10 to LINUX. 

    • mkhademi
      Subscriber

      Thank you so much Rob for always helping me with Fluent. I saw these message at the output file on the Linux cluster. The warning message at the beginning means that it is going to partition it to 72 cores then, correct? Thank you. 

      2523238 hexahedral cells, zone 12, binary.
      Warning: reading 10 partition grid onto 72 compute node machine;
               will auto partition.
       2523238 cell partition ids, zone 12, 10 partitions, binary.
        242932 mixed periodic faces, zone  2, binary.
       7419774 quadrilateral interior faces, zone 13, binary.
          4883 quadrilateral velocity-inlet faces, zone 14, binary.
          7733 quadrilateral symmetry faces, zone 15, binary.
        132802 quadrilateral interface faces, zone 16, binary.
        132802 quadrilateral interface faces, zone 17, binary.
          7733 quadrilateral symmetry faces, zone 18, binary.
          4883 quadrilateral outflow faces, zone 19, binary.
          9044 quadrilateral wall faces, zone 20, binary.
        242932 mixed shadow faces, zone  3, binary.
        242932 interface face parents, binary.
        242932 interface metric data, zone  2, binary.
        242932 interface metric data, zone  3, binary.
        242932 shadow face pairs, binary. 
       2674080 nodes, binary.
      2674080 node flags, binary.

      Building...
           mesh
          auto partitioning mesh by Metis (fast),
          distributing mesh
              pairs..................................................,
              parts..................................................,
              faces..................................................,
              nodes..................................................,
              shadow nodes..................................................,
              cells..................................................,
              bandwidth reduction using Reverse Cuthill-McKee: 34660/920 = 37.6739

    • Rob
      Ansys Employee

      Correct. If you run the "top" command you should also see a load (72) of Fluent processes chewing up cpu, that may depend on how your cluster is configured. 

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