The motion of individual particles is obtained by solving Newtons second law of motion and gas flow by the Navier Stokes equation based on the concept of local average.
颗粒的运动满足牛顿第二定律，流体相的运动规律由局部平均的纳维斯托克斯方程求解，两相间的耦合由牛顿第三定律决定。
In order to take into account the distributed mass along the stories of structure, equation of motion is given in the local coordinates of the story.
考虑层间结构分布质量及楼层处集中质量，在层局部坐标中建立运动微分方程。
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