StarCCM+ on Qarnot HPC Simcenter STAR-CCM+ is a powerful multiphysics simulation software developed by Siemens Digital Industries Software This comprehensive tool enables engineers to model and analyze complex engineering problems involving various physical phenomena, including: Fluid flow, Heat transfer, Stress analysis, Particulate flow, Electromagnetics.
This article consists of a general overview of StarCCM+ on Qarnot including useful flags and parameters to use in Tasq.
Tutorials Interactive demo In this interactive demo, you will learn how to launch a simple simulation on our bi-Xéon servers using starCCM+
Using the SDK Follow this tutoria l on our blog to learn how to launch starccm+ simulation using our Python SDK
Important flags This is a non exhaustive list of flags and parameters to consider when using Simcenter STAR-CCM+ on Qarnot cloud HPC Platform
Command Flags for Different Scenarios When running simulations, various flags are used to optimize execution for different computing environments. Below are examples and detailed explanations of each flag.
Command example:
starccm+ -batch mesh,run cylindre_complet_extrusion_both_demi_DP_reconstruit_init.sim -power
Explanation of Flags:
-batchYou can specify several commands at the same time when launching a simulation on star CCM+, or example here we want to execute themeshing and simulationrun If you want to just launch your simulation please only userun If you are familiar withStarCCM+ macro , you can use a macro file to start your simulation(<macro-file>.java) If you want to run your simulation step by step for debugging purpose, usestep -powermesh,runMultiple-Nodes Execution flags Running simulations on multiple nodes allows for parallel processing, significantly reducing computation time for large-scale simulations. By distributing tasks across several machines, you can leverage combined CPU and memory resources effectively. This approach is particularly beneficial when handling complex models that demand extensive computational power.
Command Example:
starccm+ -batch -mpi openmpi -mpiflags "--mca btl ^openib,tcp --mca pml ucx --mca osc ucx" -machinefile /job/mpihosts mesh,run cylindre_complet_extrusion_both_demi_DP_reconstruit_init.sim
Explanation of Flags:
-batchYou can specify several commands at the same time when launching a simulation on star CCM+, or example here we want to execute themeshing and simulationrun If you want to just launch your simulation please only userun If you are familiar withStarCCM+ macro , you can use a macro file to start your simulation(<macro-file>.java) If you want to run your simulation step by step for debugging purpose, usestep The following flags should not be edited as they enabled to run your case on Qarnot's infrastructure
-mpi openmpi-mpiflagsYou should not need to edit them to use start running your simulation on Qarnot --mca btl ^openib,tcp: Excludes specific byte transfer layers (e.g.,openib) and enforces the use of TCP.--mca pml ucx: Sets the point-to-point messaging layer to use UCX (Unified Communication X).--mca osc ucx: Configures the one-sided communication for collective operations using UCX.-machinefileUsage Tips: Qarnot Scheduler automatically set the IP addresses of the node in/job/mpihosts 