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[FAQ]

This can be specified in Fluent from the ‘Parallel->Partition/Load Balance->Dynamic Load Balancing’ menu option. By default, Fluent automatically repartitions when a load imbalance threshold of 20% is detected. But this automatic load balancing can be disabled, and a specific interval (i.e., number of time steps) can be applied. In cases involving moving and deforming meshes with remeshing, it maybe beneficial to switch from the default automatic repartitioning method based on the imbalance threshold and specify a fixed interval of time steps at which the mesh should be repartitioned. This eliminates a potential problem of so called “orphan cells” or a small group of cells belonging to one partition which are completely embedded into another partition. These orphan cells can be generated in parallel during dynamic remeshing and they can have a detrimental effect on the solution robustness. Repartitioning at a fixed time step internal (e. g. every 5 steps) prevents appearance of orphan cells since the new cells generated during remeshing process are migrated to appropriate mesh partitions at a more frequent interval.