求教：怎么用nastran做双层壳壳间充液流固耦合问题
各位大虾：最近在利用nastran做流固耦合问题，具体描述如下：双层圆柱壳壳间充液问题，我用acmodl卡片时，f06计算文件总会出现如下提示警告信息：
*** USER WARNING MESSAGE 6151 (GP5B)
ACOUSTIC COUPLING
MATRIX WILL NOT BE CREATED FOR FACE = 9730 9878 9879 9731 0 0 0 0
OF ELEMENT ID = 13033 ,BECAUSE ITS FLUID GRID POINTS DO NOT HAVE CORRESPONDING STRUCTURAL GRID
POINTS.
USER ACTION: IF COUPLING IS DESIRED, THEN CHECK GRID POINT DATA.
*** USER WARNING MESSAGE 6151 (GP5B)
ACOUSTIC COUPLING
MATRIX WILL NOT BE CREATED FOR FACE = 9731 9732 9769 9768 0 0 0 0
OF ELEMENT ID = 13034 ,BECAUSE ITS FLUID GRID POINTS DO NOT HAVE CORRESPONDING STRUCTURAL GRID
POINTS.
USER ACTION: IF COUPLING IS DESIRED, THEN CHECK GRID POINT DATA.
*** USER WARNING MESSAGE 6151 (GP5B)
ACOUSTIC COUPLING
MATRIX WILL NOT BE CREATED FOR FACE = 9732 9733 9770 9769 0 0 0 0
OF ELEMENT ID = 13035 ,BECAUSE ITS FLUID GRID POINTS DO NOT HAVE CORRESPONDING STRUCTURAL GRID
POINTS.
USER ACTION: IF COUPLING IS DESIRED, THEN CHECK GRID POINT DATA.
………………………………………………………………
请指教！这到底是什么原因，能具体解释一下吗？该怎么处理
或者能教一教怎样处理双层壳壳间充液问题
大侠们，求救啊
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