平板上有叶片绕流的源项模型

将源项模型应用于叶片涡流发生器的数值模拟中,以叶片在当地流场中产生的升力作为源项一个分量原型,并引入了法向力作为源项另一个分量原型.该源项由叶片的形状、大小、位置以及来流条件等参数决定.在数值模拟中,叶片位于平板上,其高度约为当地边界层厚度的1/5.在相同计算条件下,对"升力-法向力"源项模型计算结果和全网格计算结果及实验数据进行比较.源项模型可以得到与全网格数值模拟基本一致的诱导速度场和涡量场,而网格量减少了65%.

Source term model of vane flow on a flat plate

A source term model was applied to numerical simulation of a vane vortex generator,where the lift force created by a vane vortex generator was used as one part of the prototype of source term model,and a normal force was introduced as the other one.The source term depends on the shape,size and location of the vane and the freestream conditions.During numerical simulation,the vane was located on a flat plate,with its height about one fifth of the thickness of local boundary layer.The calculated results of "lift & normal force" source term model were compared under the same conditions with the calculated results and experimental data for a full gridded vane vortex generator.This source term model helps to predict the velocity and vortex fields in consistent with a full gridded vane vortex,but the grid number reduces by 65%.