LOAD AND MOTION TRANSFER ALGORITHMS FOR FLUID STRUCTURE INTERACTION PROBLEMS WITH NONMATCHING DISCRETE INTERFACES - MOMENTUM AND ENERGY-CONSERVATION, OPTIMAL DISCRETIZATION AND APPLICATION TO AEROELASTICITY/

The prediction of many fluid/structure interaction phenomena requires solving simultaneously the coupled fluid and structural equations of e quilibrium with an appropriate set of interface boundary conditions. I n this paper, we consider the realistic situation where the fluid and structure subproblems have different resolution requirements and their computational domains have non-matching discrete interfaces, and addr ess the proper discretization of the governing interface boundary cond itions. We present and overview new and common algorithms for converti ng the fluid pressure and stress fields at the fluid/structure interfa ce into a structural load, and for transferring the structural motion to the fluid system. We discuss the merits of these algorithms in term s of conservation properties and solution accuracy, and distinguish be tween theoretically important and practically significant issues. We v alidate our claims and illustrate our conclusions with several transie nt aeroelastic simulations. (C) 1998 Elsevier Science S.A.