Development of Numerical Schemes for Hybrid Turbulence Modelling in an Industrial CFD Solver

Abstract

The dissipation and dispersion properties of a family of unstructured high order upwind schemes are investigated in view of their application to the numerical simulation of compressible turbulent flows using hybrid RANS/LES modelling. A numerical limiter based on the Ducros sensor is introduced to reduce numerical dissipation in flow regions dominated by turbulent structures.

High-Order Hybrid RANS/LES Strategy for Industrial Applications

“…More details can be found in Ref. [Pont et al, 2013]. The proposed strategy has been implemented within FLUSEPA, the unstructured finite-volume solver developed by Airbus Defence & Space (ADS) to calculate compressible, multidimensional, unsteady, viscous and reactive flow over bodies in relative motion.…”

“…Mesh resolution requirements become particularly severe if industrial codes based on low order, low resolution discretization schemes are used. In this work we assess a recently developed hybrid RANS/LES strategy, combining a self-adaptive hybrid turbulence model [Perot et al, 2007] and a hybrid high-order finite volume scheme [Pont et al, 2013], for flow around industrial geometries, namely, the Ariane 6 and Ariane 5 space launchers. Increasingly complex geometrical details are included in the simulation and the results are compared with the experimental data available for the average and root mean square (rms) of the longitudinal distribu- tion of the pressure coefficient, which represent a significant quantity of interest for launcher design.…”

An adaptive remeshing strategy for unsteady aerodynamics applications

“…Boxes used for the simulation This test case contains boundary layers on the cylinder, a vortex shedding (due to the interaction between the Kelvin-Helmholtz instabilities and the Von Kármán street) and a lambda shock wave. The use of a hybrid RANS/LES on this specific test case with our CFD code has been studied in [20] and clearly showed the robustness of the turbulence modeling strategy. We study here the robustness of the limiter for the repartition of the variables.…”

Automatic Hybrid RANS/LES Strategy for Industrial CFD

“…This kind of method allows to ensure high-order accuracy on general meshes. The truncation error and the spectral properties of the preceding numerical scheme have been studied in details for finite volume operators ranging from the second to the fifth order of accuracy in [4]. Due to the use of an upwind numerical flux at cell interfaces, all schemes in the family exhibit relatively high damping errors, and reduction of errors obtained by increasing the scheme order does not compensate the significant increase in computational complexity and cost.…”