网格非正交性对水流场模拟的影响

Effect of grid nonorthogonality on water flow field simulation

为减少在建立网格模型时出现的畸形网格单元导致的较大的计算误差,研究网格非正交性对水流场模拟的影响,建立多种正交性不同的四边形网格模型,设置边界并且施加激励进行水流场模拟实验,得到水流场特征值.依据真实水流场数据,对水流场流速矢量以及水位进行误差分析,得出水流场误差与网格非正交性具有正相关性.该研究可为流场模拟提供一定的参考.

To reduce the larger calculation error resulting from some distorted grid units when establishing grid models,the effect of grid nonorthogonality on water flow field simulation is studied. Many kinds of quadrilateral grid models with different orthogonality are established. Through setting boundaries and applying excitation to conduct the flow field simulation experiment,the feature values of water flow field are obtained. The error analysis is made on the velocity vector and the water level of water flow field according to the real water flow field data. The positive correlation between the water flow field error and the grid nonorthogonality is got. The study can provide reference for flow field simulation.