Formulation of a Modal-Split-Explicit Time Integration Method for Use in the UCLA Atmospheric General Circulation Model.

Abstract

With appropriate modifications, a recently proposed modal-split-explicit time integration scheme (MSES) is incorporated into the UCLA atmospheric general circulation model. In this scheme, the terms in the governing equations that generate the linear gravity waves are split into different vertical modes. Each mode is integrated with an optimal time step, and at periodic intervals these modes are recombined. The other terms are integrated with a time step dictated by the CFL condition for low frequency waves. This large time step requires a special modification of the advective terms in the polar region to maintain stability. Seventy-two hour test runs show that MSES is a viable, efficient, and accurate scheme for global weather prediction purposes. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 24, 1981
Accession Number
ADA102161

Entities

People

  • R. V. Madala
  • W. C. Chao

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Atmospheric Sciences
  • Ecology
  • Equations
  • Fluid Dynamics
  • Frequency
  • Gravity
  • Gravity Waves
  • Grids
  • Military Research
  • Navy
  • Northern Hemisphere
  • Polar Regions
  • Research Facilities
  • Sea Level
  • Southern Hemisphere
  • Stratified Fluids
  • Weather Forecasting

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)