Effects of Inhomogeneous Filtering and Buoyant Forcing on the Dynamic Subgrid Scale Model

Abstract

The dynamic subgrid scale model is used in large-eddy simulation of the stratified Ekman layer. Results from direct numerical simulations (DNS) for the neutral Ekman layer were used to test model efficacy. Three dimensional test filtering was employed in the dynamic calculation. A significant increase in accuracy was observed in the neutral layer when this filtering was employed, as compared to filtering only in planes parallel to the surface. The model shows the ability to model both unstable and stable regions, and its effect vanishes where stratification strongly quenches the turbulence.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1992
Accession Number
ADA252076

Entities

People

  • Joel Ferziger
  • M. Bohnert

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • California
  • Channel Flow
  • Classification
  • Equations
  • Flow
  • Flow Fields
  • Fluid Flow
  • Heat Energy
  • Heat Flux
  • Inversion
  • Military Research
  • Scale Models
  • Security
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers