A New Mixing Length Formulation for the Eddy-Diffusivity Parameterization

Abstract

In this paper a new mixing length formulation for the eddy-diffusivity parameterization of turbulence is suggested. The new formulation relates directly the mixing length with the turbulent kinetic energy. The simulation of dry atmospheric convection and turbulence, with a 1 D boundary layer model, show that the model reproduces quite well the growth of the boundary layer. It is also shown that the eddy diffusivity closure is not purely diffusive, since the diffusion coefficient changes with height, and that the "advective" term has a significant impact close to the surface and the boundary layer top. In general, it is shown that the new mixing length formulation is a promising alternative to fully close the turbulence problem in atmospheric models.

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Document Details

Document Type
Technical Report
Publication Date
Jun 06, 2001
Accession Number
AD1111145

Entities

People

  • J. Teixeira
  • S. Cheinet

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advection
  • Atmospheres
  • Boundaries
  • Boundary Layer
  • Buoyancy
  • Climate Change
  • Coefficients
  • Convection
  • Differential Equations
  • Diffusion
  • Diffusion Coefficient
  • Diffusivity
  • Energy
  • Equations
  • Fluid Dynamics
  • Kinetic Energy
  • Layers
  • Partial Differential Equations
  • Turbulence
  • Turbulent Diffusion
  • Weather Forecasting

Fields of Study

  • Environmental science

Readers

  • Computational Modeling and Simulation
  • Fluid Dynamics.