Simulating Highly Nonlinear Ship-Wave Interaction with EdgeCFD
Thomas Miras1; Fernando Rochinha1; Renato Elias1; José Alves2; Carlos Silva2; Alvaro Coutinho1
1 High Performance Computing Center & Mech. Engineering Dpt - Federal University of Rio de Janeiro; 2 Laboratory of Computational Methods in Engrg & Civil Engrg Dpt- Federal University of Rio de Janeiro
doi:10.20906/CPS/CILAMCE2015-0515
Resumo
Offshore engineering presents a wide range of complex Fluid-Structure Interaction problems such as highly non linear wave and structure interactions. Those problems still are of interest as consequences of the liquid movements can be dramatic. Thus, there exists a need for some industrial sectors to understand and estimate this interaction. Within the framework of ALE, the software EdgeCFD developed uses edge-based parallel finite elements for the Navier-Stokes equations and the VOF approach to describe the free surface evolution. Mesh updating is accomplished by a parallel edge-based solution of a non-homogeneous scalar diffusion problem in each spatial coordinate. We focus here on the Fluid-Structure coupling. Data exchange through boundary conditions allows the coupling between the fluid and structure equations. The results presented are in the continuity of previous works [1] where an implicit-explicit time integration scheme for the rigid body motion was used. We extend the existing simulation capabilities with the implementation of an implicit MidPoint time integration scheme for both translational and rotational motions. The performances of our staggered scheme are improved via a Predictor/Corrector method [3] for the force and moment of the equations of the rigid body motion. A particular attention is made for the non linear equation of rotation where a subiterative approach is considered. The capabilities of this formulation are tested on a test case: a vibrating plate in an incompressible liquid, inspired from [2] which allows the comparison with results from the literature. Finally, an industrial test case is studied considering a FPSO vessel interacting with waves. [1] J.L.D. Alves, C.E. Silva, N.O. Guevara, A.L.G.A. Coutinho, R.N. Elias, F.A. Rochinha, M.A.D. Martins, M.D.A.S. Ferreira, and D. F.C. Silva. Edgecfd-ALE: A stabilized finite element system for fluid-structure interaction in offshore engineering.31st Int. Conf. on Ocean, Offshore and Artic Engineering,2012 [2] C. Hesch, A.J. Gil, A.
Palavras-chave: Fluid-Structure Interaction (FSI); ALE; Rigid Body Motion; Time Integration