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@Tian 初始化一定高度的颗粒堆积在流化床底部试试?现在这个设置,侧面全是周期边界,入口固定速度,假设是单相流情形,因为没有壁面剪切力,速度场会是完全均匀的。针对多相流情形,因为你入口设定的固相体积分率也是固定值,所以这个流动里面一切都是那么均匀,没有任何会引起不均匀的因素,所以算出来是均匀的也可以理解。