摘要
利用平面二维非恒定流数值模型，来研究中间渠道内非恒定流问题，该模型基于任意三角形计算网络，采用隐式求解自由表面的剖开算子法，离散求解控制方程，有效地处理了非线性混合算子和计算自由表面的困难，避免人工滤波措施，提高了计算精度和计算稳定性，并在三峡通航工程方案比较中得到应用。计算结果表明，该模型能较好地反映中间渠道内水流特征，与分析模拟船闸不同运行方式下渠道内水流波动特性，达到优化运行方案，改善渠道内航行条件的目的。
On the basis of the operator-splitting finite element method, a numerical model for 2-D unsteady flow in a midchannel is presented in this paper. The model can successfully solve the problem encountered in calculation on hybrid operators and is suitable to complex boundaries. Moreover, the coupling of propagation equation with continuity equation for solving the free surface is used, which has a better stability and higher accuracy. The algorithm presented in this paper is verified in calculating the unsteady flow in the channel between the ship locks in the Three Gorges project and the result is satisfactory and helpful in optimizing operation modes.
关键词
水流特性
非恒定流
中间渠道
数值模拟
渠道
flow character, unsteady flow, midchannel, numerical calculation
