利用大涡模拟方法和Lagrangian方法研究了腐蚀产物(颗粒)在核反应堆冷却回路管道中的沉积现象(Reynolds数2.5×105).利用Lagrangian方法跟踪颗粒轨迹,颗粒运动方程中包含牵引力、升力、浮力和重力.流体和颗粒是单相耦合,计算中忽略颗粒-颗粒间碰撞.流场计算结果与实验数据以及直接数值模拟计算结果吻合良好.计算结果显示,小颗粒趋于沉积在管道中心处,而大颗粒趋于沉积在管道边缘,这种趋势随颗粒粒径增大而加强.在近管道底部区域,颗粒沉积分布密度随颗粒粒径的增大而提高,小颗粒在底部分布均匀,而大颗粒在流向速度低速区聚集.
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