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Hydrodynamics analysis of density current using two-equation turbulence k − w model
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http://hdl.handle.net/1860/1447
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| Title: | Hydrodynamics analysis of density current using two-equation turbulence k − w model |
| Authors: | Afshin, Hossein
Firoozabadi, Bahar
Rad, Manoucher |
| Keywords: | Turbulence modeling
Computational hydraulics |
| Issue Date: | 11-Sep-2006 |
| Publisher: | Michael Piasecki and College of Engineering, Drexel University |
| Citation: | Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732 |
| Abstract: | Density current is formed when fluid heavier than ambient fluid flows down an inclined bed. These flows, which are common phenomena in nature, can be produced by salinity and temperature inhomogeneities, or suspended particles of silt and clay. Driven by density differences between the inflow and clear water in the reservoirs, the density current plunges the clear water and moves toward the dam. Density currents flowing on a sloping bed, the vertical spreading due to water entrainment plays an important role in determining the propagation rate in longitudinal direction. In this work, two-dimensional density currents were simulated by turbulent model. A collocated finite volume scheme has been used to simulate the motion of this current which propagates under deep ambient water. The governing equations form an elliptic system of partial differential equations, namely continuity, x- momentum, and y- momentum equations for flow and mass conservation equation for particles and the model equations for turbulent flow.
In this study, density current with uniform velocity and uniform concentration enters a channel via a sluice gate into a lighter ambient fluid and moves forward down-slope. The model has been verified with the experimental data sets. Moreover, results have been compared with the standard turbulent model and show that the model has the poor result on this current in comparison with the turbulent model. |
| Description: | Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization. |
| URI: | http://hdl.handle.net/1860/1447 |
| ISBN: | 0977447405 |
| Appears in Collections: | Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]
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