| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve stability of a subgridding method of assessing wave propagation arising in a physical system by obtaining a numerical approximation. <P>SOLUTION: The method includes steps of: defining a computational domain comprising a first, second and intermediate grids; performing a first update procedure after a first-grid time step; performing a coupling procedure; and performing a second update procedure after a second-grid time step. The coupling procedure comprises performing temporal coupling by using values from the first grid; performing an intermediate update procedure after the second-grid time step of the second update procedure; and performing spatial coupling by using values from the intermediate grid. In defining the computational domain, the perimeter of the intermediate grid is defined to be wider than the perimeter of the second grid on at least one side of the second grid by a distance equal to at least two times the size of one of the first-grid cells in that dimension. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
