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1.
用Level Set方法求解具有自由面的流动问题   总被引:9,自引:0,他引:9  
袁德奎  陶建华 《力学学报》2000,32(3):264-271
为采用Level Set方法来计算有自由的流动问题提出了一种方案,把自由水面视为水和空气的交界面,两种介质用统一的N-S方法求解,在自由面两侧分别采用各自的密度和粘性,并在自由面上给以适当的光滑;采用边界元法求解双调和方程来确定距离函数;N-S方程用投影法求解,文中给出了二维水池水面振荡和瞬时溃坝问题的算例,可以看出用LevelSet方法求解有自由面流动问题是有效的。  相似文献
2.
Lattice Boltzmann方法应用实例--一维溃坝波模拟   总被引:4,自引:0,他引:4  
通过分析Lattice Boltzmann(LB)方法的多尺度方程和一维浅水波方程,建立了计算一有渠非恒定流的LB模型,对一维溃坝波动这一典型应用实例进行了模拟分析,结果与Preissmann隐格式及解析解十分一致,说明将LB方法引入实际的一维明渠非恒定流计算是可行的。  相似文献
3.
二维溃坝波的反射与绕射   总被引:2,自引:0,他引:2  
韩庆书  吴家红 《力学学报》1992,24(4):493-499
本文推导了间断分解公式,建立了Godunov型格式,研究了二维溃坝波的传播、反射和绕射。计算结果符合物理实际,令人满意。方法是有效的,可以提供水工部门作为设计和防护的依据。  相似文献
4.
一维溃坝洪水波的高精度数值模拟   总被引:1,自引:0,他引:1  
将ENO(Essentially Non-Oscillatory)格式和Runge-Kutta时间离散的思想应用于一维Saint-Venant方程组的求解,数值模拟溃坝洪水,得出了水位和流速的沿程分布。经与理论解比较可见,数值解在间断波附近没有出现数值振荡,水位和流速大小均符合较好,表明ENO格式是一类新的高精度无振荡差分格式,采用ENO格式所建立的高分辨率模型能够很好地模拟溃坝波的演进过程。  相似文献
5.
A method for modeling the propagation of discontinuous waves over a dry bed using the first approximation of shallow water theory is proposed. The method is based on a modified conservation law of total momentum that takes into account the concentrated momentum losses due to the formation of local turbulent vortex structures in the fluid surface layer at a discontinuous-wave front. A quantitative estimate of these losses is obtained by deriving the shallow water equations from the Navier-Stokes equations with allowance for viscosity, which has a rapidly increasing effect in the turbulent flow regions described by discontinuous waves. The stability of the discontinuous waves admitted by the modified system of conservation laws of shallow water theory is examined. As an example, a comparative analysis is performed of the solutions of the dam-break problem obtained for the classical and modified shallow water models. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 6, pp. 22–43, November–December, 2007  相似文献
6.
Theoretical and experimental data which make it possible to find the flow-rate, momentum and energy of the fluid that enters the lower pool after a discontinuity breakdown (dam break) in a rectangular channel with an even bottom, a step (sharp downstream rise in the bottom), a shelf (sharp drop in the bottom), and a threshold on the bottom are presented. __________ Translated from Izvestiya Rossiiskoi Academii Nauk, Mekhanika Zhidkosti i Gaza, No. 5, 2005, pp. 115–123. Original Russian Text Copyright ? 2005 by Bukreev.  相似文献
7.
The results of an experimental study of dam-break waves for both a dry and a flooded bottom in the lower pool are compared with the first approximation of shallow-water theory. It is shown that this approximation adequately describes the height and velocity of the hydraulic jump in the lower pool for a flooded bottom, does not describe the undulations, and is inconsistent with the experimental data on the perturbation propagation velocity in the upper and, for a dry bottom, in the lower pool.Translated from Izvestiya Rossiiskoi Academii Nauk, Mekhanika Zhidkosti i Gaza, No. 5, 2004, pp. 143–152. Original Russian Text Copyright © 2004 by Bukreev, Gusev, A. A. Malysheva, and I. A. Malysheva.  相似文献
8.
A review of the information available in the literature is given, and new experimental data on the depth and discharge at the dam site after a total and a partial dam break are presented. It is shown that in the case of a partial dam break with the formation of a rectangular breach, the specific discharge per unit width of the breach is higher than the specific discharge in the case of a total dam break with the same excess initial energy in the headwater. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 5, pp. 77–87, September–October, 2006.  相似文献
9.
A single-layer shallow-water model is used to study the solvability of the problem of flows generated by dam break over a bed level discontinuity in the form of a step onto which water flows. Solutions in which the total flow energy is conserved on the step and solutions in which the energy is lost on the step are considered.  相似文献
10.
The single-layer shallow-water model is used to study flows generated by dam break over a bed level discontinuity in the form of a drop from which water flows. Emphasis is given to submerged regimes in which downstream wave processes affect the upstream flow. The paper considers solutions in which the total flow energy is conserved on the drop and solutions in which the energy is lost on the drop.  相似文献
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