A numerical study on flow pass a three-dimensional obstacle in a strong stratified layer
- Nayoya Institute of Technology (Japan)
- Kyushu Univ. (Japan)
A numerical study has been made of some aspects of strong stratified flow pass a three-dimensional obstacle. The flow of a stratified fluid over or around an obstacle can be indicated by Froude number (The Froude number, Fr = U/Nh, where U is the flow speed, h is the height of the obstacle, and N, the Brunt-Vaisalla frequency, is a measure of the stratification). At low Froude number, two phenomena are recognized: the onset of flow around instead of over the obstacle (i.e., flow splitting) and onset of wave breaking above the obstacle. Arguments from linear theory, experiment and simulation suggest the flow splitting and wave breaking occurred for sufficiently low Froude number. Despite its practical importance to aeronautics and air pollution dispersion, the effects of strong stratification on the flow are still far from clear. The present work used a three-dimensional, nonhydrostatic, terrain following numerical model to investigate the stratification effects. The numerical results clarify the behavior of the flow at low Froude number, showing the relative importance of the stratification effects on the so-called flow splitting, wave breaking, and separation phenomena.
- OSTI ID:
- 466300
- Report Number(s):
- CONF-9606185--
- Country of Publication:
- United States
- Language:
- English
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