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Technical Paper

Best Practice: Scale-Resolving Simulations in Ansys CFD

While today’s CFD simulations are mainly based on Reynolds-Averaged Navier-Stokes (RANS) turbulence models, it is becoming increasingly clear that certain classes of flows are better covered by models in which all or a part of the turbulence spectrum is resolved in at least a portion of the numerical domain. Such methods are termed Scale-Resolving Simulation (SRS) models in this paper. This report is intended as an addition to the code-specific Theory and User Documentation available for both Ansys Fluent and Ansys CFX. That documentation describes in detail how to select and activate these models, so that information is not repeated here. The current document is intended to provide a general understanding of the underlying principles and the associated limitations of each of the described modeling concepts. It also covers the types of flows for which the models are suitable as well as flows where they will likely not work well. Finally, the impact of numerical settings on model performance is discussed.

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