Loading…

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...

Full description

Saved in:
Bibliographic Details
Published in:Computers & fluids 2018-03, Vol.165, p.160-172
Main Authors: Gurugubelli, P.S., Ghoshal, R., Joshi, V., Jaiman, R.K.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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.
ISSN:0045-7930
1879-0747
DOI:10.1016/j.compfluid.2018.01.016