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Development of Fluid-Structure Interaction Program for the Mercury Target

JAERI is developing the liquid mercury target as a neutron scattering experiment facility. The liquid mercury target is planned to receive MW class proton pulse beam and high intensity spallation reactions occur in the target generating neutrons. Under such condition, high density heat is released and consequently strong pressure wave is generated. It is considered that the pressure wave propagates through mercury and reflects on the container of target made of hard stainless steel, and the erosion of the wall might be caused by the cavitation. In fact, some experiments show that pit type scratch is created on the wall when strong pressure wave reflects on it. If the phenomenon happens in mercury target, it makes the life span of container shorter. Since the pressure wave propagation and the wall deformation have influence with each other in this phenomenon, a coupled simulation study is needed in order to reveal the process of the scratch generation. In this report, a simulation of the interaction between the pressure wave propagation of the liquid mercury and the wall deformation is carried out in order to investigate the possibility of the cavitation in the mercury target. In particular, we propose a method in which the bubble dynamics model is linked with the so-called weakly coupled method between the fluid model and the solid model. In particular, we propose a method in which the bubble dynamics model is linked with the so-called weakly coupled method between the fluid model and the solid model. In our project of the year 2004, the fluid-structure interaction program was developed for the fine meshes of the mercury target, for example, 10 million grid points. The large scale model was applied to simulate the interaction between the pressure wave propagation and the wall deformation.