The main purpose of the virtual grid is to convert a solid wall boundary condition into an interface condition while no fluid flow computations are conducted within the virtual grid.
虚拟网格为紧贴物面的面网格，它的作用是将物面边界条件传递给其它网格的边界面，而其本身不作流场计算。
The boundary condition of restriction and the natural condition of variation for the virtual principle of displacement are given too.
明确了虚位移原理的变分约束条件和变分自然条件。
The boundary condition of restriction and the natural condition of variation for the virtual principle of displacement are given too.
明确了虚位移原理的变分约束条件和变分自然条件。
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