Interaction of Motor Exhaust with Mobile Underwater Structure Using RADIOSS ALE
Jean-François Badreau, MBDA
MBDA is an industry leader in designing and producing missiles and missile system.
During the major part of their lifecycle, munitions are stored in hermetic containers so that they remain in an inert atmosphere. Short time after their ignition, a removable part must be ejected in order to enable the munitions to get out the containers and also to open a leak for the motor exhaust. One common solution is to reuse the energy resulting from the motor jet to open the container.
Until now, simulations of these phenomena were performed by separated CFD and mechanical simulations. With the CFD simulation, the pressure, resulting from the motor jet, was calculated and then applied to a mechanical model which calculated kinematics and forces on the removable structures. The purpose of this study is to perform this in only one and the same simulation.
We show, in this presentation, an example of a rocket ignited from an underwater platform. A coupled fluid structure model has been used with RADIOSS ALE to perform the simulation of the motor exhaust jet and its interaction with the structure of the container. Such a simulation required the use of a multiphase material law and the Fluid-Structure Interface.
The management, in the same model, of the fluid part and the structure, with independent meshes, has decreased the elapsed time for tuning and performing the whole simulation. Moreover, the number of validation tests has been reduced, thanks to good accuracy of the simulation.