Accession Number:

AD0730953

Title:

Numerical and Wind Tunnel Simulation of Response of Stratified Shear Layers to Nonhomogeneous Surface Features.

Descriptive Note:

Technical rept.,

Corporate Author:

COLORADO STATE UNIV FORT COLLINS FLUID DYNAMICS AND DIFFUSION LAB

Personal Author(s):

Report Date:

1971-06-01

Pagination or Media Count:

315.0

Abstract:

In the report four different categories of flow are investigated in a thermal wind tunnel. They are Airflow over an infinitely wide obstacle Airflow over an infinitely wide heated island Airflow over an infinitely wide heated obstacle and, Airflow over a heated island with a finite width. The first three categories are two dimensional aspects of prototype phenomena a mountain lee-wave, an urban heat island, and a heated mountain, respectively. The last displays a three dimensional feature of a corresponding urban heat island phenomenon. Numerical models were constructed for the first three cases. However, for the three dimensional problem, only the wind tunnel experiment was conducted since a numerical integration for such a three dimensional problem is not practical yet. Both laboratory and numerical results showed close agreement. They indicated strong nonlinearity perturbation quantities could not be neglected compared with their mean values especially in the vicinity of the disturbing source obstacle, heated area, and a linear super-position rule could not be applied to predict the solution of combined effects of heating and topography. Author

Subject Categories:

  • Atmospheric Physics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE