过坝溢流水力计算的数学模型

关于过坝溢流的水利计算,由于求解偏微分方程组非常困难,通常都是假设无黏性势流进行计算,但实际上流体都是有黏性的,假设无黏性势流的计算结果与实际偏差较大.本文根据对以往溢流坝面流场数值计算模型的讨论,将溢流坝流场假设为无旋的黏性流体,建立了新的数学模型.该模型将流体按势流假设考虑,又通过转换边界条件将黏性影响产生的能量损失计算在内,使得流场数值计算结果更符合实际.文中给出的实例证实用该方法数值计算的结果和实验结果吻合很好.

Mathematic Model of the Hydraulics Calculation of Spill Weir Dam

For the hydraulics calculation of spill weir dam,due to the difficulty to solve the group of partial differential equation,it was normally calculated by potential flow without stickiness.But in the real practice,liquid is sticky,the calculation results have a quite relatively difference with that in practice.In this paper,based on the discussion of the mathematic model of the flow over spill weir dam,under the condition of potential flow without considering the sticky,a new mathematic model was set-up by ch...