Self-excited sloshing due to the fluid discharge over a flexible plate weir

This paper presents an analytical model for the self-excited sloshing due t o the fluid discharge over a flexible weir, as observed in the cooling circ uit of the French fast breeder reactor, Super-Phenix-1. To clarify the inst ability mechanism, we analyzed the case in which a rectangular reservoir wa s divided into an upstream and a downstream plenum by a flexible plate weir . The kinematic and dynamic effects of the discharged fluid on downstream p lenum sloshing are discussed in details. Calculations are presented for the rectangular fluid-structure model with successively increasing fluid level difference between the upstream and downstream plenums, and the instabilit y mechanism is examined. [S0094-9930(00)00302-4].