Large eddy simulation of a muffler with the high-order spectral difference method

TL;DR

This paper explores the use of high-order spectral difference methods combined with subgrid-scale modeling for large eddy simulation of a muffler, demonstrating improved flow feature capture and solution quality.

Contribution

It introduces a novel combination of spectral difference discretization with subgrid-scale modeling for LES of mufflers, highlighting the benefits of high-order schemes.

Findings

High-order solver captures flow features effectively.

Coupling with wall-adapting local eddy-viscosity model improves solution quality.

Subgrid-scale modeling enhances LES accuracy.

Abstract

The combination of the high-order accurate spectral difference discretization on unstructured grids with subgrid-scale modelling is investigated for large eddy simulation of a muffler at Re = 4.64 10^4 and low Mach number. The subgrid-scale stress tensor is modelled by the wall-adapting local eddy-viscosity model with a cut-off length which is a decreasing function of the order of accuracy of the scheme. Numerical results indicate that although the high-order solver without subgrid-scale modelling is already able to capture well the features of the flow, the coupling with the wall-adapting local eddy-viscosity model improves the quality of the solution.