Abstract
An overview of scale-resolving simulation (SRS) methods used in ANSYS Computational Fluid Dynamics (CFD) software is provided. The main challenges, especially when computing boundary layers in large eddy simulation (LES) mode, will be discussed. The different strategies for handling wall-bound flows using combinations of RANS and LES models will be explained, along with some specific application examples. It will be demonstrated that the stress-blended eddy simulation (SBES) approach is optimal for applications with a mix of boundary layers and free shear flows due to its low cost and its ability to handle boundary layers in both RANS and wall-modeled LES (WMLES) modes.
Highlights
Industrial Computational Fluid Dynamics (CFD) simulations have been based on Reynolds-averaged Navier–Stokes (RANS) turbulence modeling concepts
It will be demonstrated that the stress-blended eddy simulation (SBES) approach is optimal for applications with a mix of boundary layers and free shear flows due to its low cost and its ability to handle boundary layers in both RANS and wall-modeled
The SBES model offers an optimal platform for the different application for such as the Substantial progress has been made scenarios in the last twoapproaches, decades in of be run in classical detached eddy simulation (DES)-like mode, whereby the boundary layers are covered by RANS
Summary
Industrial Computational Fluid Dynamics (CFD) simulations have been based on Reynolds-averaged Navier–Stokes (RANS) turbulence modeling concepts. In wall boundary layers, the turbulent length scale near the wall becomes very small relative to the boundary layer thickness (increasingly so at higher Re numbers) This poses severe limitations for large eddy simulations (LES), as the computational effort required is still far from the computing power available to the industry (e.g., Spalart [5]). For large domains, it is frequently necessary to cover only a small portion with SRS models, while most of the flow can be computed in RANS mode In such situations, zonal or embedded LES (ELES) methods are attractive, as they allow one to explicitly specify the region where LES is required (e.g., Cokljat et al [20], Deck et al [21] Xiao [22]). Fluent® , a generalized, commercial finite-volume CFD code solving flows in structured and unstructured meshes
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