Abstract
Several algorithms for the loose coupling of fluid and structural dynamics codes are described. The first class of algorithms treats the displacement of the surface of structure that is in contact with the fluid. It is shown that a straightforward treatment of the displacements for arbitrary choice of timesteps can lead to instabilities. For optimal stability, at each timestep the ending time of the fluid should be just beyond the ending time of the structure. The second class of algorithms treats the movement of the flow mesh in an ALE setting. The use of a projective prediction of mesh velocities, as well as linelet preconditioning for the resulting PCG system, can significantly reduce the effort required. Examples are included that show the effectiveness of the proposed procedures.
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