TY - JOUR
T1 - Gas diffusion over an isolated hill under neutral, stable and unstable conditions
AU - Ohba, R.
AU - Hara, T.
AU - Nakamura, S.
AU - Ohya, Y.
AU - Uchida, T.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/12
Y1 - 2002/12
N2 - Wind tunnel experiments of gas diffusion were performed over flat terrain and over an isolated three-dimensional hill under neutral, stable and unstable (sea breeze) conditions. Conditions of airflow in the wind tunnel were determined so as to satisfy the similarity rule for the bulk Richardson number, by controlling temperature profiles and wind velocity of the thermally stratified wind tunnel. Typical characteristics were observed under each condition of atmospheric stability; reversed vortex behind the hill in neutral condition, downward slope wind in stable one and convective motion in unstable one. We compared these experiments with the results of a Direct Numerical Simulation (DNS) model for the wind velocity over the hill under neutral conditions. The numerical results showed good agreement with the experimental results.
AB - Wind tunnel experiments of gas diffusion were performed over flat terrain and over an isolated three-dimensional hill under neutral, stable and unstable (sea breeze) conditions. Conditions of airflow in the wind tunnel were determined so as to satisfy the similarity rule for the bulk Richardson number, by controlling temperature profiles and wind velocity of the thermally stratified wind tunnel. Typical characteristics were observed under each condition of atmospheric stability; reversed vortex behind the hill in neutral condition, downward slope wind in stable one and convective motion in unstable one. We compared these experiments with the results of a Direct Numerical Simulation (DNS) model for the wind velocity over the hill under neutral conditions. The numerical results showed good agreement with the experimental results.
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U2 - 10.1016/S1352-2310(02)00642-8
DO - 10.1016/S1352-2310(02)00642-8
M3 - Article
AN - SCOPUS:0036888555
VL - 36
SP - 5697
EP - 5707
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
IS - 36-37
ER -