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[FAQ]

The scalability depends on the physics and number of nodes per partition. 1000 nodes per partition is too small for ANSYS CFX. Assuming the physical models allow for good scalability, you can find the following information in the ANSYS CFX Modelling guide: 16.4.1. Optimizing Mesh Partitioning In the ANSYS CFX 17.2 Modelling Guide you will find: Do not run small jobs in parallel For tetrahedral meshes, you may want to use a minimum of 30,000 nodes per partition. For partitions smaller than this, you are unlikely to see any significant performance increase and may even see parallel slow down. For hexahedral meshes, good parallel performance improvements are usually not seen until a minimum of 75,000 nodes per partition is reached. These numbers are machine dependent and can be higher or lower. Dual CPU PCs usually give poorer performance due to lack of bandwidth in the memory bus. Essentially the two CPUs can demand more memory access than the memory bus can provide. Use a sensible number of partitions The partitioning of a mesh leads to the creation of overlap regions at the partition interfaces. These regions are responsible for communication and memory overhead during a parallel run. During partitioning, ANSYS CFX prints partitioning diagnostic information to the CFX-Solver Manager text window and output file about partition overlaps. The percentage of overlap nodes to the total number of mesh nodes should ideally be less than 10% for efficient partitioning. Values greater than 20% will impair performance and are not recommended. Additional comment: Overlap node percentage above 20% maybe ok, if the absolute number of nodes in this domain is small, e.g. you have huge fluid domain and a small solid domain. Radiation and Particle modelling usually do not scale as good. For particle it is very dependent to the particle distribution within the physical domain.