沙波纹表面风场结构研究

he studay of the changes of flow field on the surface of sand ripples has vary important significance to the research of development of sand ripples. Though the simulation of symmeprical sand ripples of flow filed, this thesis takes the change of structure of sand ripples of flow filed in different spacing as fundamental research object and get the development and change of the contour line of speed in different Reynolds number and different distance. What more, the author obtain the changing trends of flow filed on the top of the sand ripples,as well as the trend of the separation and reflow on the back of the sand ripples.