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whiteheron

F2006M235
Modelling FSI Problems in FLUENT: a General Purpose Approach by Means of UDF Programming
Dr. Marco Evangelos Biancolini, Tor Vergata Uiversity, Italy
Dr. Riccardo Baudille, University of Rome, Italy
Fluid-structure interaction (FSI) is an important and interesting phenomenon, but it is a difficult challenge for numerical modelling. However there are several cases in which the interaction between the fluid and adjoining structure governs the physical behaviour of the system. Fluid-structure interaction plays an important role in automotive problems such as aerodynamic induced deformation, aero noise, tire hydroplaning, air bags deployment, pressure driven engine valves, ducts deformation in high pressure injection systems, engine intake ducts deformation and general flow-induced vibration.
An FSI model has been developed for FLUENT 6.2 using a dedicated structural solver, coded as a user-defined function (UDF). Arbitrary structures are handled by the model using a dedicated FEM solver or generating stiffness and mass matrices controlling the NASTRAN solver within FLUENT. A dedicated GUI has been developed in order to handle automatically the initialization stage in both cases. A special solution strategy that leaves the CFD simulation time virtually unaffected by the simultaneous working of the structural code, is applied. The result is a general-purpose model, capable of solving a variety of problems without the need for significant modifications to the software each time. Some test cases and application examples are presented in order to validate the code and to demonstrate its functionality.