Accession Number : AD0766753

Title :   Study and Investigation of Computer Algorithms for the Solution of the Shallow-Fluid Equations as a Means of Computing Terrain Influences on Wind Fields.

Descriptive Note : Final technical rept.,

Corporate Author : CRAMER (H E) CO INC SALT LAKE CITY UTAH

Personal Author(s) : Tingle,Arthur G. ; Bjorklund,Jay R.

Report Date : JUL 1973

Pagination or Media Count : 163

Abstract : The report describes the development and documentation of a computer algorithm, containing a two-dimensional shallow fluid model, for calculating the wind field above complex terrain. The optimum finite-differencing procedure employed for numerical solutions of the algorithm is a Lax-Wendroff scheme using the grid points and two time levels in combination with a nine-point low-pass filter. Comparisons of calculated wind field patterns with recent detailed observations of wind circulations above complex terrain show excellent qualitative agreement in the limited cases available for analysis. Additionally, the computer algorithm for the two-dimensional model, when applied to the terrain at White Sands Missile Range, gave results that were consistent with the limited observations available for two example situations. The computer program containing the two-dimensional shallow-fluid model, written in Fortran 5 language and designed for use on a UNIVAC 1108 machine, is discussed. (Modified author abstract)

Descriptors :   (*ATMOSPHERIC MOTION, EQUATIONS OF MOTION), TWO DIMENSIONAL FLOW, PARTIAL DIFFERENTIAL EQUATIONS, CURVE FITTING, GRAPHICS, COMPUTER PROGRAMMING, NUMERICAL ANALYSIS, MOUNTAINS, TURBULENT BOUNDARY LAYER, WIND, MOUNTAINS, NEW MEXICO

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE