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Let us start with a very famous quota which can be applied to general tasks. Nevertheless, in the field of geometry preparation for CFD purposes has significant importance:
â€œEverything should be made as simple as possible, but no simpler.â€
During a flow path geometry definition, one should keep in mind a simplicity of the geometry. For a simulation of a complex turbomachinery geometry, tiny details which does not significantly influence the flow should be removed from the flow path. Such details can not be captured by a reasonable amount of cells or can not be captured at all.The picture below depicts an (artificially created) example of such a detail.
INPUT RULE 2: Create the flow path geometry as simple as possible.