A new paradigm of dissipation-controllable, multi-scale resolving schemes for compressible flows

TL;DR

This paper introduces PnTm-BVD-CD, a novel shock-capturing scheme for high-speed compressible flows that offers controllable dissipation and multi-scale resolution, improving accuracy in DNS and LES simulations.

Contribution

The paper presents a new dissipation-controllable shock-capturing scheme, PnTm-BVD-CD, capable of resolving multi-scale structures and capturing shocks without non-physical oscillations.

Findings

Effectively captures large-scale discontinuities and sharp interfaces.

Allows tunable numerical dissipation between high-order schemes.

Enables implicit LES for under-resolved small-scale turbulence.

Abstract

The scale-resolving simulation of high speed compressible flow through direct numerical simulation (DNS) or large eddy simulation (LES) requires shock-capturing schemes to be more accurate for resolving broadband turbulence and robust for capturing strong shock waves. In this work, we develop a new paradigm of dissipation-controllable, shock capturing scheme to resolve multi-scale flow structures in high speed compressible flow. This novel paradigm of shock-capturing scheme is named as PnTm-BVD-CD. The proposed PnTm-BVD-CD scheme has following desirable properties. First, it can capture large-scale discontinuous structures such as strong shock waves without obvious non-physical oscillations while resolving sharp contact, material interface and shear layer. Secondly, the numerical dissipation property of PnTm-BVD-CD can be effectively controlled between n+1 order upwind-biased scheme and non-dissipative n+2 order central scheme through a simple tunable parameter $\lambda$. Thirdly, with $\lambda=0.5$ the scheme can recover to n+2 order non-dissipative central interpolation for smooth solution over all wavenumber, which is preferable for solving small-scale structures in DNS as well as resolvable-scale in explicit LES. Finally, the under-resolved small-scale can be solved with dissipation controllable algorithm through so-called implicit LES (ILES) approach.