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Layer-averaged numerical study on effect of Reynolds number on turbidity currents
Direct numerical simulations of lock-exchange turbidity currents with small Reynolds number were often assumed to well represent turbidity currents with large Reynolds number. Here, this assumption is examined using a layer-averaged numerical model. It is shown that in the initial stage the current front position converges if the Reynolds number approaches certain threshold values. However, at later stages, turbidity currents with larger Reynolds number propagate faster and farther. This is because, by definition, a larger Reynolds number corresponds to more sediment mass carried by the current, and thus higher driving force. Furthermore, turbidity currents with the same Reynolds number can correspond to very different front positions and deposition profiles, as the Reynolds number depends on both current thickness and concentration.
Layer-averaged numerical study on effect of Reynolds number on turbidity currents
Direct numerical simulations of lock-exchange turbidity currents with small Reynolds number were often assumed to well represent turbidity currents with large Reynolds number. Here, this assumption is examined using a layer-averaged numerical model. It is shown that in the initial stage the current front position converges if the Reynolds number approaches certain threshold values. However, at later stages, turbidity currents with larger Reynolds number propagate faster and farther. This is because, by definition, a larger Reynolds number corresponds to more sediment mass carried by the current, and thus higher driving force. Furthermore, turbidity currents with the same Reynolds number can correspond to very different front positions and deposition profiles, as the Reynolds number depends on both current thickness and concentration.
Layer-averaged numerical study on effect of Reynolds number on turbidity currents
Hu, Peng (author) / Tao, Junyu (author) / Li, Wei (author) / He, Zhiguo (author)
Journal of Hydraulic Research ; 58 ; 628-637
2020-06-06
10 pages
Article (Journal)
Electronic Resource
Unknown
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