Derivation and testing of a new multiscale kepsilon turbulence model
Abstract
A new twoscale kepsilon turbulence model is presented, the derivation of which begins with a different fundamental equation than that used previously for multiscale or singlescale models. The new approach removes the three major shortcomings inherent in the dissipation equation of previos models: (1) the physical reasoning invoked in hypothesizing the algebraic form of the source/sink terms, (2) the use of onelength scale to represent a spectrum of eddy sizes, and (3) the complete absence of twopoint correlation influences. The comparison of predictions obtained by the new twoscale kepsilon model with experimental measurements demonstrated the superiority of the new model over the standard kepsilon models, occurring when there is an abrupt change in the shear field or when flowfield regions dominated by different length scales occur.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1990
 Bibcode:
 1990aiaa.meetQT...K
 Keywords:

 Computational Fluid Dynamics;
 Energy Dissipation;
 Energy Spectra;
 KEpsilon Turbulence Model;
 Turbulent Wakes;
 Combustion Chambers;
 Energy Transfer;
 Flow Distribution;
 Supersonic Combustion Ramjet Engines;
 Fluid Mechanics and Heat Transfer