| タイトル | The relationship between eddy-transport and second-order closure models for stratified media and for vortices |
| 本文（外部サイト） | http://hdl.handle.net/2060/19730019429 |
| 著者（英） | Donaldson, C. D. |
| 著者所属（英） | Aeronautical Research Associates of Princeton, Inc. |
| 発行日 | 1973-01-01 |
| 言語 | eng |
| 内容記述 | The question is considered of how complex a model should be used for the calculation of turbulent shear flows. At the present time there are models varying in complexity from very simple eddy-transport models to models in which all the equations for the nonzero second-order correlations are solved simultaneously with the equations for the mean variables. A discussion is presented of the relationship between these two models of turbulent shear flow. Two types of motion are discussed: first, turbulent shear flow in a stratified medium and, second, the motion in a turbulent line vortex. These two cases are instructive because in the first example eddy-transport methods have proven reasonably effective, whereas in the second, they have led to erroneous conclusions. It is not generally appreciated that the simplest form of eddy-transport theory can be derived from second-order closure models of turbulent flow by a suitably limiting process. This limiting process and the suitability of eddy-transport modeling for stratified media and line vortices are discussed. |
| NASA分類 | FLUID MECHANICS |
| レポートNO | 73N28161 |
| 権利 | No Copyright |
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