Under a Lagrange coordinate system the trajectory of particles was tracked by the use of a random orbital method.
在拉格朗日坐标系下，用随机轨道法跟踪颗粒的轨迹。
Moving boundary problem can easily be solved with equations under the Lagrange Coordinate System for numerical computations of homogenous flow in interior ballistics.
对内弹道均相流数值计算，用拉格朗日坐标下的方程组，容易处理运动边界问题。
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