Evolution of a double-front Rayleigh-Taylor system using a GPU-based high resolution thermal Lattice-Boltzmann model

TL;DR

This paper investigates the turbulent evolution of a double-front Rayleigh-Taylor system using a high-resolution GPU-accelerated thermal Lattice-Boltzmann model, revealing effects of front collision in long-term dynamics.

Contribution

It introduces a novel initial condition with three-layer density profiles and demonstrates the impact of front collision using high-resolution GPU-based simulations.

Findings

Collision of turbulent fronts affects long-term asymptotic behavior

High-resolution GPU simulations capture detailed front dynamics

The optimized Lattice-Boltzmann code enables efficient large-scale simulations

Abstract

We study the turbulent evolution originated from a system subjected to a Rayleigh-Taylor instability with a double density at high resolution in a 2 dimensional geometry using a highly optimized thermal Lattice Boltzmann code for GPUs. The novelty of our investigation stems from the initial condition, given by the superposition of three layers with three different densities, leading to the development of two Rayleigh-Taylor fronts that expand upward and downward and collide in the middle of the cell. By using high resolution numerical data we highlight the effects induced by the collision of the two turbulent fronts in the long time asymptotic regime. We also provide details on the optimized Lattice-Boltzmann code that we have run on a cluster of GPUs