Record Display for the EPA National Library Catalog


Main Title Moderately Stable Flow Over a Three-Dimensional Hill: A Comparison of Linear Theory with Laboratory Measurements.
Author Thompson, R. S. ; Shipman, M. S. ; Rottman, J. W. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;NSI Technology Services Corp., Research Triangle Park, NC. ;North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/078;
Stock Number PB91-196584
Additional Subjects Plumes ; Inviscid flow ; Air pollution ; Hills ; Equations of motion ; Froude number ; Fourier transformation ; Mathematical models ; Three dimensional flow ; Dispersion ; Laminar flow ; Flow visualization ; Natural convection ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-196584 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 17p
Several series of experiments were performed in a stratified towing tank to study the near-field flow of a linearly stratified fluid over an isolated three-dimensional hill. The streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye released upstream of the hill. Velocities over the hill center were obtained by analysis of video recordings of the dye plumes and with a propeller anemometer. The results of these experiments are compared with numerical solutions, computed using Fast Fourier Transforms, of the linearized equations of motion for an inviscid fluid. Good agreement is found for Froude numbers (based on the hill height) greater than about 2.0. For Froude numbers greater than about 4.0, flow patterns were observed to differ only slightly from those for neutral flow.