Coherent Structure-Reflective Turbulent Viscous Flow Modeling.
Annual rept. Mar 85-Mar 86,
HOKENSON (GUSTAVE J) LOS ANGELES CA
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By using a mulitple-element scalecoherence decomposition of the Navier-Stoke equations, the essential characteristics of the large scale turbulent structure are computed in wall-bounded shear flows. The effect of small-scale turbulence structure is modeled and the large-scale turbulence structure is computed assuming weakly non-linear large-scale dynamics. The effects of large-scale non-linearity and the presence of wave-like elements in the flow are accounted for using perturbation theory. The resultant propagation, evolution in the convected reference frame and statistical occurrence of three-dimensional vortical instabilities are computed and compared to experimental data. Coherent structure reflective turbulence models will be constructed from this analysis.
- Fluid Mechanics