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A variational projection scheme for nonmatching surface-to-line coupling between 3D flexible multibody system and incompressible turbulent flow
•New variational surface-to-line projection for 3D flow and flexible multibody interaction.•Coupling of the variational projection scheme with NIFC scheme.•Development of hybrid RANS/LES modeling for high Reynolds number.•Validation of coupled framework for a long flexible marine riser.•Application...
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Published in: | Computers & fluids 2018-03, Vol.165, p.160-172 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •New variational surface-to-line projection for 3D flow and flexible multibody interaction.•Coupling of the variational projection scheme with NIFC scheme.•Development of hybrid RANS/LES modeling for high Reynolds number.•Validation of coupled framework for a long flexible marine riser.•Application of the method for coupled problems in offshore/ocean engineering.
This paper is concerned with the partitioned iterative formulation to simulate the fluid-structure interaction of a nonlinear multibody system in an incompressible turbulent flow. The proposed formulation relies on a three-dimensional (3D) incompressible turbulent flow solver, a nonlinear monolithic elastic structural solver for constrained flexible multibody system and the nonlinear iterative force correction scheme for coupling of the turbulent fluid-flexible multibody system with nonmatching interface meshes. While the fluid equations are discretized using a stabilized Petrov–Galerkin formulation in space and the generalized-α updates in time, the multibody system utilizes a discontinuous space-time Galerkin finite element method. We address two key challenges in the present formulation. Firstly, the coupling of the incompressible turbulent flow with a system of nonlinear elastic bodies described in a co-rotated frame. Secondly, the projection of the tractions and displacements across the nonmatching 3D fluid surface elements and the one-dimensional line elements for the flexible multibody system in a conservative manner. Through the nonlinear iterative correction and the conservative projection, the developed fluid-flexible multibody interaction solver is stable for problems involving strong inertial effects between the fluid-flexible multibody system and the coupled interactions among each multibody component. The accuracy of the proposed coupled finite element framework is validated against the available experimental data for a long flexible cylinder undergoing vortex-induced vibration in a uniform current flow condition. Finally, a practical application of the proposed framework is demonstrated by simulating the flow-induced vibration of a realistic offshore floating platform connected to a long riser and an elastic mooring system. |
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ISSN: | 0045-7930 1879-0747 |
DOI: | 10.1016/j.compfluid.2018.01.016 |