Hi Isaac I am doing a simulation on a similar configuration, a wall-mounted cylinder with Re=750. It's actually the first time I read about the optimization technique to speed up the run. Could you let me know if it had a significant influence? Kind regards syavash On Wed, Aug 9, 2023 at 4:38 AM Isaac Rosin <isaac.rosin1@ucalgary.ca> wrote:
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Hello Nektar Community,
I am running a full 3D DNS simulation at Re=400 of a flow past a rectangular prism using the incompressible solver. This flow is laminar but 3D effects are present. I am using a structured mesh generated using gmsh with a p order of 4 which comes to roughly 2.6 million degrees of freedom. A colleague is able to run a similar but slightly more complex DNS simulation at Re=3900 on 1/8 the number of processors and he still obtains results much faster. All signs indicate I should be able to use far fewer resources than I currently am, but neither of us can figure out how to optimise further than I already have. I followed the optimisation section of the Nektar user guide, tweaked my mesh several times, changed the time step size, etc., but all of these adjustments showed marginal improvements at best. I would be very grateful if anyone has any suggestions. I am providing my case files here: https://drive.google.com/drive/folders/1iT0GvZgE0MyfmjNe1GYMlAKJp-8fh57X?usp... the slurm file called P4.sh has the script I normally use on clusters.
I look forward to hearing from you!
All the best, Isaac _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users