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Simulation of a lock-release gravity current based on a non-hydrostatic model

机译：基于非静水压模型的锁定释放重力电流模拟

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Gravity currents are important in many fields, including the estuarine sciences, meteorology and hydraulic engineering. The NHWAVE (non-hydrostatic wave) model was applied to simulate the detailed interface structure between a lock-release gravity current and the ambient fluid. The simulated structures, including the front height, front position and velocity of the current, are consistent with the results of laboratory experiments. However, the internal structure of the current is different from that revealed by previous research. The Kelvin-Helmholtz phenomenon in the interface and the interface vortices were successfully captured by the NHWAVE model. The difference in velocity between the front and rear vortices leads to entrainment, further causing changes in the shapes and amount of vortices. Flow field results obtained by the NHWAVE model reveal the existence of a significant circular flow, as well as some small eddies within it. The significant circular flow supports the forward movement of the current, whereas the small eddies reflect interface vortices. In contrast, hydrostatic simulation with the same model settings fails to capture the vortices. This research shows that the NHWAVE model performs better than a hydrostatic model when simulating the Kelvin-Helmholtz instability phenomenon and vortex entrainment in a lock-release gravity current.
机译：重力电流在许多领域都很重要，包括河口科学，气象和水力工程。应用NHWAVE（非静水压波）模型来模拟锁定释放重力电流和环境流体之间的详细界面结构。模拟结构，包括电流的前高度，前位置和速度，与实验室实验的结果一致。然而，目前的内部结构与以前的研究透露的内部结构不同。通过NH波型模型成功捕获了界面中的Kelvin-Helmholtz现象和接口涡旋。前后涡流之间的速度差异导致夹带，进一步引起形状和涡流量的变化。 NH波模型获得的流场结果揭示了存在显着的圆形流量的存在，以及其中的一些小漩涡。显着的圆形流量支持电流的前进运动，而小漩涡反映界面涡旋。相比之下，具有相同型号设置的静水压模拟无法捕获涡流。该研究表明，当在锁定释放重力电流中模拟Kelvin-Helmholtz不稳定现象和涡流夹带时，NH波的模型比静液压模型更好。

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