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Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow

På svenska

Author

Editor

  • Matthew J. Churchfield

Summary, in English

The performance of the Sub Grid Scale models is studied by simulating a separated flow over a wavy channel. The first and second order statistical moments of the resolved velocities obtained by using Large-Eddy simulations at different mesh resolutions are compared with Direct Numerical Simulations data. The effectiveness of modeling the wall stresses by using local log-law is then tested on a relatively coarse grid. The results exhibit a good agreement between highly-resolved Large Eddy Simulations and Direct Numerical Simulations data regardless the Sub Grid Scale models. However, the agreement is less satisfactory with relatively coarse grid without using any wall models and the differences between Sub Grid Scale models are distinguishable. Using local wall model returned the basic flow topology and reduced significantly the differences between the coarse meshed Large-Eddy Simulations and Direct Numerical Simulations data. The results show that the ability of local wall model to predict the separation zone depends strongly on its implementation way.

Department/s

Publishing year

2015-10-16

Language

English

Publication/Series

E3S Web of Conferences

Volume

5

Document type

Conference paper

Publisher

EDP Sciences

Topic

  • Fluid Mechanics and Acoustics

Conference name

Second Symposium on OpenFOAM® in Wind Energy

Conference date

2014-05-19 - 2014-05-21

Conference place

Boulder, Colorado, United States

Status

Published