Eulerian algorithm for analyzing fluid-structure interaction in the fast reactor containment

The Eulerian algorithm described is capable of analyzing two-dimensionally the fluid-structure interaction in a typical LMFBR containment consisting of various structure components. The algorithm has several special features. First, it employs the Eulerian coordinates in the formulation and enables the technique to be applicable to excursions involving large material distortions. Second, it provides rigorous hydrodynamic analyses at the fluid-structure interface and at the geometrical discontinuities, which is very important in the study of wave-transmission and -diffraction problems. Third, the algorithm incorporates a well-developed finite-element structural program that can account for both material and geometrical nonlinearities. The application of this Eulerian algorithm is not limited to fast reactor containment. It can also be applied to the major piping components, such as valve and IHX, where internal baffle plates may play an important role in the wave propagation. Moreover, the treatment of the time-dependent irregular cell can be integrated with the IMF/sup 2/ Method and structural dynamics program for investigating the coupled fluid-structure problems involving two-phase flows