Abstract: A computational procedure is proposed to solve the interaction problem of elastic structure and fluid. Little simplification of fluid is carried out. The coupling algorithm solves the equations for the fluid and solid domains independently of each other. It transfers fluid forces and solid displacements and velocities across the fluid-solid interface. The algorithm continues to loop through the solid and fluid analyses until convergence is reached. Convergence in the stagger loop is based on the quantities being transferred at the fluid-solid interface. Ar-bitrary Lagrangian-Eulerian formulation is adopted to treat the moving interface between the fluid and the structure. The cou-pling algorithm is programmed based on ANSY5.6 with APDL. Two numerical examples are given. The results show the effec-tiveness of the procedure.

Key words: Fluid-structure interaction, Arbitrary Lagrangian-Eulerian, Vibration analysis, Viscous fluid