Coherent structures in Dissipative Particle Dynamics simulations of the transition to turbulence in compressible shear flows

TL;DR

This paper uses Dissipative Particle Dynamics simulations to study coherent structures during the transition to turbulence in compressible shear flows, demonstrating the method's ability to replicate complex flow phenomena across different Mach numbers.

Contribution

It introduces DPD simulations for compressible flows near turbulence transition, showing their effectiveness in capturing coherent structures consistent with experiments and DNS.

Findings

Coherent structures are consistent with experimental and DNS results.

Bifurcation from laminar flow is bistable and shifts with compressibility.

DPD effectively reproduces nonlinear flow instabilities.

Abstract

We present simulations of coherent structures in compressible flows near the transition to turbulence using the Dissipative Particle Dynamics (DPD) method. The structures we find are remarkably consistent with experimental observations and DNS simulations of incompressible flows, despite a difference in Mach number of several orders of magnitude. The bifurcation from the laminar flow is bistable and shifts to higher Reynolds numbers when the fluid becomes more compressible. This work underlines the robustness of coherent structures in the transition to turbulence and illustrates the ability of particle-based methods to reproduce complex non-linear instabilities.