A fluid-structure coupling method to obtain parameter distributions in a combustion chamber with moving boundaries

A fluid-structure coupling method was put forward to obtain parameter distributions in a fluid field induced by the combustion of energetic materials. A one-dimensional two-fluid model was utilized to govern the transient combustion. The nonlinear mechanical behaviors were predicted basing on the engineering software ABAQUS. Different from most of the existed studies, we coupled the fluids and the structures through moving boundaries by using a user subroutine interface VUAMP in ABAQUS and realized the application of an irregularly distributed pressure by using a user subroutine interface VDLOAD. The coupling approach was validated by comparing the predicted results with analytical solutions and experiments. Based on the validated approach, parameter distributions in the combustion chamber of a large caliber gun were obtained and the influences of the irregularly distributed pressure were further discussed. The results indicated that the coupling approach is capable of obtaining parameter distributions of the fluid field in an expanding combustion chamber. The approach can be applied to provide accurate parameter distributions in determining boundary conditions for the study of transient heat transfer in the chambers.