An Overview of Hybrid RANS–LES Models Developed for Industrial CFD

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.

Keywords

• turbulence modeling
• scale-resolving simulations (SRS)
• hybrid RANS–LES methods
• stress-blended eddy simulation (SBES)
• generalized k-ω (GEKO)