Performance of Hybrid Eulerian-Lagrangian Semi-Implicit Time-Integrators for Nonhydrostatic Mesoscale Atmospheric Modeling

Abstract

In this thesis, the performance and accuracy of explicit, semi-implicit, and Hybrid Eulerian-Lagrangian Semi-Implicit (HELSI) time-integration methods for use in atmospheric modeling are examined. Four test cases are analyzed: A density current, an inertial gravity wave, a rising thermal bubble, and a hydrostatic mountain wave. Strict attention is paid to computational time, stability criteria, and accuracy. The project aims to show increased efficiency using the HELSI method over semi implicit methods, which, in turn, should be better than the split-explicit methods currently used in mesoscale models such as WRF, COAMPS, and the German LM model. This increase in efficiency allows for valuable computational resources to be used for other purposes, such as improved data assimilation, increased spatial resolution, or more detailed physics.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2007
Accession Number
ADA473963

Entities

People

  • Thomas J. De Luca

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Applied Mathematics
  • Atmospheres
  • Atmospheric Sciences
  • California
  • Computational Science
  • Computations
  • Equations
  • Errors
  • Euler Equations
  • Gravity Waves
  • Mathematics
  • Runge Kutta Method
  • Two Dimensional
  • United States
  • Weather Forecasting

Fields of Study

  • Environmental science

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers