Overset LES with Application to a Turbulent Channel Flow

TL;DR

This paper introduces the Overset LES method, a novel perturbation approach for simulating turbulent channel flows, demonstrating high accuracy and correction capabilities compared to DNS data.

Contribution

The paper develops the Overset LES method based on Non-Linear Perturbation Equations and applies it to turbulent channel flow, showing improved accuracy and correction features.

Findings

Excellent agreement with DNS data

Effective correction of background flow imperfections

Demonstrated applicability to turbulent channel flow

Abstract

In this contribution, we present an application of a novel perturbation approach (denoted as an Overset approach) to a generic turbulent channel flow. The derivation of the governing equations (the Non-Linear Perturbation Equations extended with fluctuating viscous terms) is presented as well as subgrid-scale modeling aspects which results in the Overset LES (OLES) method. The application of the Overset method is illustrated with a generic fully developed turbulent channel flow, the results of which show excellent agreement with reference Direct Numerical Simulation data. The ability of the overset method to correct for an imperfect background flow is furthermore shown.