PERFORMANCE OF SECOND CLOSURE TURBULENCE MODELS FOR STRATIFIED OPEN CHANNEL FLOW

Abstract

The purpose of this study is to make clear a second closure turbulence model which can correctly and economically reproduce turbulence in stratified open channel flows. This study focuses on 2 representative second closure models, and assesses those performance. Firstly, the changes in the Prandtl-Kolmogorov constant and turbulent Schmidt number of those models are compared using analytical approach. Then, the accuracy is assessed using the experimental results in tidal estuarine flume. Finally, the model-constants which can reproduce the experimental results are made clear with reference to the findings obtained by DNS and LES analyses.