正交曲线拟合坐标和物理分步法在二维河道流速场计算中的应用

The Application of Orthogonal Boundary-Fitting Coordinate System and Fractional Step Method to the Calculation of 2-D Flow Field in River Course

采用正交曲线拟合坐标和物理分步法，建立了一种天然河道二维流场的数学模型。通过计算实例说明，该数学模型对数值求解具有复杂边界河道的流速场很有效，可应用于工程实践。

The orthogonal boundary-fitting coordinate system and physical fractional stepmethod are used to establish a mathematical model for 2-D flow field in natural river course.Theresults from some calculated examples indicate that this mathematical model is very effective forthe numerical solution to flow fields in river course with the complicated boundaries and that thismathematical model can be used in engineering practice.