沙漠地貌演化过程的湍流大涡模拟研究

Large-eddy simulation of the evolution of land form of desert

采用大涡模拟和混合粒径群体沙粒运动算法结合内置边界方法来模拟沙波纹与沙丘的演化和发展,在平坦沙区形成沙波纹的同时,在沙丘上同样也出现了沙波纹的结构,即沙波纹的发展出现了多尺度现象。此外,还分析了粒径对沙波纹与沙丘自身形态演化和发展的影响,以及沙丘对平坦沙区沙波纹形成发展的作用。

The methods of large-eddy simulation, the motion of sand particles with mixed sand sizes and immersed boundary are used to simulate the formation and evolution of sand ripples and sand dunes. When sand ripples appear in the flat ground, at the same time, they also shown up on the sand dunes, which means that the evolution of sand ripples has multiscale nature. Besides, the effects of sand sizes to the formation and evolution of sand ripples and sand dunes, and the effects of sand dunes to the formation and evolution of sand ripples on the flat ground, are analyzed.