The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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Session: Fluid structural inter-actions I
Room: Room 4
Session start: 10:30 Mon 19 Sep 2016

Sietse Jongsma
Affifliation: MARIN Academy

Edwin van der Weide
Affifliation: University of Twente

Jaap Windt
Affifliation: MARIN

Topics: - Fluid-structural interactions and hydroelasticity


The present research has been focussed on developing fluid-structure interaction simulation capabilities for a finite-volume flow solution method. The viscous-flow solution method considered, simulates flows modelled by the Navier-Stokes equations for incompressible flow. The structure is modelled by means of a finite-element model, for which linear elastic material properties have been assumed. For the coupling, a partitioned approach is adopted, in which the equations for the flow and structural degrees of freedom are solved in a sequential manner. Time-integration for both the flow and the structure is done by means of a second-order accurate implicit time-integration method. The partitioned approach has certain implications for the coupling of the structure and the fluid. To ensure stable time-integration, strong coupling is used. This means that the flow and the structure are updated iteratively until an equilibrium situation is reached. To realize an efficient coupling method, a quasi-Newton method is employed to update the interface position. The interface between the fluid and structural domain can be matching or non-matching. For the non-matching case nearest neighbour or radial basis function interpolation is used. For deforming the fluid domain — to accommodate the deformation of the structure — either a radial basis function interpolation method or an inverse distance weighting method can be used. The consequences of the various implementation details, like time-integration and coupling method, have been demonstrated by means of solving a 2D benchmark problem. A verification study — using a series of grids — has been performed, showing the efficiency of the coupling method and the accuracy of the interface interpolation. Results of the present implementation are compared with results from the literature and results from calculations performed with the open-source CFD method SU2. Finally, the method is demonstrated for practical maritime applications.