流固耦合怎么解决负体积问题！

我用流固耦合方法建立了单个柱状药包气爆模型，运行后出现了
*** Error negative volume in brick element # 266 cycle 2
*** Error negative volume in brick element # 2175 cycle 2
*** Error negative volume in brick element # 2176 cycle 2
*** Error negative volume in brick element # 2185 cycle 2
*** Error negative volume in brick element # 2186 cycle 2
*** Error negative volume in brick element # 2215 cycle 2
这个问题怎么解决！