Toward Improving the Efficiency and Realism of Coupled Meteorological---Acoustic Computer Models for the Forest Canopy

Report No. ARL-MR-586
Authors: Arnold Tunick
Date/Pages: April 2004; 26 pages
Abstract: Several physics-based computer models have been developed to calculate one- and two-dimensional forest canopy micrometeorology and turbulence for future U.S. Army acoustic application research. Individual computer codes have incorporated various computational methods on a uniform grid to solve the meteorological fields. However, it may be possible to improve the efficiency and realism of the coupled meteorological?acoustic computer models by introducing variable grid. Variable grid will allow for better distribution of grid points and will extend calculations higher into the boundary layer above the forest. A finer grid inside the forest and a coarser grid above the forest will help to resolve important meteorological (and acoustic) scales and processes. Therefore, the following report presents results from some preliminary tests to incorporate this important feature into numerical codes. First, several simpler physics-based diffusion models are developed to benchmark fundamental (numerical) techniques. Both explicit and implicit differencing schemes are examined. In addition, numerical stability criteria for these calculations are demonstrated. Then, successful preliminary tests on these codes are extended to more complicated meteorological?acoustic models for the forest canopy.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2004