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How can I control leakage when simulating explosions with Fluid/Structure Coupling Method in LS-DYNA?

The multi-material ALE formulation is used to model the response of a plate subjected to close-range explosions in LS-DYNA. Both the explosive and the surrounding air was explicitly modelled.The coupling between the fluid and the structure was established based on a penalty coupling method. However,an obvious leakage of both the pressure and the explosion products was observed during my simulations. The penalty factor PFAC was increased to attempt to improve leakage. When the leakage is improved a little bit, however, another problem arises. The sliding energy reaches a very large negative value compared with the internal energy, and it means the result is incorrect. Do these problems need to be taken care of when simulating explosions? What should I do to get an accurate result through a numerical simulation in LS-DYNA?

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