LES of an Inclined Jet into a Supersonic Turbulent Crossflow

TL;DR

This paper presents large-eddy simulation results of an inclined helium jet into a supersonic turbulent crossflow, highlighting flow structures, vortical formations, and scalar transport dynamics.

Contribution

It introduces a LES-SGS stretched-vortex model to study complex gas-dynamics interactions in a high Mach number flow with detailed visualization.

Findings

Vortical structures include sheets, tilted tubes, and rings.

Vortical structures correlate with helium concentration fields.

Flow features are visualized through animations and isosurfaces.

Abstract

This short article describes flow parameters, numerical method, and animations of the fluid dynamics video "LES of an Inclined Jet into a Supersonic Turbulent Crossflow" (http://ecommons.library.cornell.edu/bitstream/1813/14073/3/GFM-2009.mpg [high-resolution] and http://ecommons.library.cornell.edu/bitstream/1813/14073/2/GFM-2009-web.m1v [low-resolution] video). We performed large-eddy simulation with the sub-grid scale (LES-SGS) stretched-vortex model of momentum and scalar transport to study the gas-dynamics interactions of a helium inclined round jet into a supersonic ($M=3.6$) turbulent (\Reth$ =13\times10^3$) air flow over a flat surface. The video shows the temporal development of Mach-number and magnitude of density-gradient in the mid-span plane, and isosurface of helium mass-fraction and $\lam_2$ (vortical structures). The identified vortical structures are sheets, tilted tubes, and discontinuous rings. The vortical structures are shown to be well correlated in space and time with helium mass-fraction isosurface ($Y_{\rm He}=0.25$).