Abstract

Computational fluid dynamics (CFD) has progressed to the point where flow problems can be solved in domains containing solid objects with complex, irregular geometry in relative motion along arbitrary paths through the fluid domain. The solvers incorporate moving mesh and mesh morphing techniques. With this new CFD capability the detailed stress distribution created by flow over the surface of a moving solid and the capability of computational structural mechanics (CSM) software to solve for both small and large displacements of solids from applied loads, it is now possible to solve a wide variety of fluid structure interaction (FSI) problems by coupling the two types of software. This paper presents development of procedures to couple STAR-CCM+® CFD software to LS-DYNA® CSM software to solve FSI problems. An initial application of the coupled software to FSI analysis of incipient motion of large riprap rocks is described. Two cases were used to test the coupling. The first has a rock layer in a channel with no bridge structures, and the second has an abutment corner that contracts the flow. Three representative rocks were included in the coupling and the approximate inlet flow velocity required to lift a rock and move it downstream was determined.

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