Experimental and numerical analysis of grid generated turbulence with and without mean strain

TL;DR

This study combines experimental and numerical methods to analyze grid generated turbulence with and without mean strain, evaluating turbulence statistics and Reynolds Stress Models for accuracy and optimal coefficients.

Contribution

It provides new experimental data and assesses the accuracy of Reynolds Stress Models in grid turbulence with mean strain, recommending optimal model coefficients.

Findings

Reynolds stress anisotropies characterized in experiments

Reynolds Stress Models' predictions compared with experimental data

Optimal model coefficients identified for grid turbulence with mean strain

Abstract

This paper presents experimental and numerical analysis of grid generated turbulence with and without the effects of applied mean strain. We conduct a series of experiments on decaying grid generated turbulence and grid turbulence with mean strain. Experimental data of turbulence statistics including Reynolds stress anisotropies is collected, analyzed and then compared to the predictions of Reynolds Stress Models to assess their accuracy. The experimental data is used to evaluate the variability in the coefficients of the rate of dissipation model and the pressure strain correlation models used in Reynolds Stress Modeling. For both models we recommend optimal values of coefficients that should be used for experimental studies of grid generated turbulence.