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How to optimize computation time in fluent

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Old   April 9, 2020, 12:21
Default How to optimize computation time in fluent
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Hi everyone, I'm a mechanical engineering student who's working on the master thesis using the workstation of my university. I'm currently working with 12 cores in parallel but the simulation time of my project in Fluent (a cooling system for a battery module: 3.700.000 elements) still be around 18 hours. The RAM occupied by the project is around 5GB. The head of faculty's licenses suggests me to use the following commands:

/SOLU
BCSOPTION,,INCORE

I tried to write them in the Fluent's prompt, but it does not recognizes the commands. Moreover, searching in a lot of forums, seems those commands work only in the structural software of Ansys. Have I write them in another part of the program? In some prompt in Workbench?

In any other case, can you help me to optimize the calculus of my project? I'm using a research academic license of Ansys 18.2.

Thanks you in advance
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Old   April 9, 2020, 13:07
Default Speed and Performance
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The commands are indeed meant only for APDL, i.e., Ansys Structural Simulation tool. Fluent is pretty good at parallel performance. You do not need to enter any commands to improve that. However, you need to ensure that the hardware is as per the requirement.

After launching Fluent in parallel, go to Parallel > Network > Latency as well as Bandwidth. If latency is higher than 2 or Bandwidth is less than 2000, then its your hardware which is a problem. If both are good, then the time you are getting is best you could get with the setup of your case and number of cores. You can certainly increase the number of cores to speed it up. There is a limit to that, of course, and that limit is dependent upon hardware again. For Windows based cluster, 32 cores is a limit; anything beyond that and system will be slower. For Linux based cluster, you can decompose a mesh such that each core gets at least 50000 cells. So, with 3.7 mn cells, you can use up to 72 cores. Beyond that, you need really good hardware and with that the mesh can be decomposed to as low as 10000 cells per core. But that's the limit.
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