Conference proceeding
A 3-D numerical investigation of the development of density driven finite-channel lock-release currents at high Grashof numbers
RIVER FLOW 2006, VOLS 1 AND 2, p.1559
2006
Abstract
Lock-exchange gravity current flows produced by the instantaneous release of a heavy fluid are investigated using 3D high-resolution Large Eddy Simulation (LES) simulations at Grashof numbers between 9.6 x 10(8) and 8 x 10(9). It is found that the finely resolved 3D simulations on meshes containing around 35 million cells correctly predict a constant front velocity over the initial slumping phase and a front speed decrease proportional to t(-1/3) (the time t is measured from the release) over the inviscid phase, in agreement with theory and experimental observations. It is found that the KH billows do not preserve their structure across the width of the channel and break rapidly into smaller 3D structures. In the near-wall region beneath the upstream part of the current, it is found the intensity of the turbulence is large enough to induce the formation of low and high streamwise velocity streaks, similar to the ones observed in channel flows.
Details
- Title: Subtitle
- A 3-D numerical investigation of the development of density driven finite-channel lock-release currents at high Grashof numbers
- Creators
- S K OoiG ConstantinescuL Weber
- Contributors
- A H Cardoso (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- RIVER FLOW 2006, VOLS 1 AND 2, p.1559
- Language
- English
- Date published
- 2006
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984231917402771
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