Accession Number:

ADA128928

Title:

Numerical Simulation of Atmospheric Flow on Variable Grids Using the Galerkin Finite Element Method.

Descriptive Note:

Doctoral thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1983-03-01

Pagination or Media Count:

144.0

Abstract:

A hypothesis is made that the Galerkin Finite Element Method GFEM offers a viable option to the traditional Finite Difference Method FDM for numerical weather prediction. The shallow water barotropic primitive equations are the forecast equations for all experiments. The hypothesis is tested by observing simple, analytic atmospheric wave propagation on uniform and variable mesh grids. Second, a strongly forced solution simulating small scale nonlinear interactions is evaluated for both the GFEM and FDM. Finally, a variable, moving grid for a GFEM model is compared to a uniform, higher resolution GFEM model for a strong vortex in a mean flow. The GFEM shows a better propagation for simple atmospheric waves and better prediction to a forced nonlinear solution than the FDM model. A moving variable grid follows an area of strong gradients while not generating noise in the transition zone. Author

Subject Categories:

  • Meteorology
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE