Single- to Double-Vortex Numerical Simulation in 2D Water Tanks Based on the Linearized Navier-Stokes Equations
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摘要: 建立了Navier-Stokes方程的预估校正有限差分方法,在此基础上求得了二维水槽内部单涡到双涡的数值解,所得结果与前人的数值结果和解析解吻合很好.数值模拟结果表明,自由振动运动中自由面波高因粘性作用会发生衰减,且Reynolds数越大衰减越缓慢.在短时间内倾斜加速度激励下对于不同Reynolds数会出现一定周期的单涡.经过长时间的倾斜激励,水槽内涡场由单涡变化成双涡,而且只在较低的Reynolds数条件下出现双涡.
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关键词:
- 线性化Navier-Stokes方程 /
- 预估-校正有限差分方法 /
- 涡 /
- 交错网格 /
- 数值模拟
Abstract: A predictor-corrector finite difference method based on the linearized Navier-Stokes equations was developed to numerically simulate the single- and double-vortex motions in 2D rectangular water tanks. Numerical results obtained with the present method were compared with the linearized analytical solution and previously published numerical results, and the agreements were pretty good. It is found that the free surface wave oscillates with a decaying amplitude in the case of viscous fluid, and as the Reynolds number increases, the free surface wave elevation decays more slowly. Under the short-period pitching excitation, a clear single vortex cycle occurs at different Reynolds numbers. However, the single vortex will change to double ones in the case of a long-period pitching excitation, only when the Reynolds number is small to some extent. -
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