fluid-solid coupling with interDynamicFoam
 

hello!
I meet a problem! I use interDynamicFoam for dam-reservoir analysis.
fluid-based on interDynamicFoam solid-finite element method
Look the picture that I insert. I use the staggered iteration method . That is dam give the fluid displacement and velocity by contact surface, and fluid give the dam dynamic pressure by contact surface .
When modulus of elasticity of concrete gravity dam is 2.55e8 Pa , It is divergent even though there is no eathquake(that means bedrock is static) . The displacement and the dynamic pressure of the contact surface become bigger and bigger ,at last openfoam can not bear the so big value ! when time step is smaller ,it is the same.
could you help me ?