Partitioned iterative and dynamic subgrid-scale methods for vibrating offshore structures

Abstract eng:
Fully-implicit combined field scheme proposed in [1, 2] has been extended to model flow-induced vibration of 3D offshore structure in a turbulent flow. We employ a partitioned iterative and dynamic subgrid-scale (SGS) schemes for solving coupled fluid-rigid body interaction using unstructured grid. The iterative scheme relies on the so-called non-linear interface force correction formulation to stabilize the variational coupled system based on the filtered Navier-Stokes equations. The interface corrections provide the force equilibrium with arbitrary accuracy while maintaining the velocity continuity condition along the fluid-structure interface. We show that our secondorder scheme is stable for both VIV and galloping instabilities found in a freely vibrating square cylinder with strong added-mass effects. We demonstrate the SGS-based large-eddy simulation solver for 3D multicolumn semi-submersible floater subjected to flow-induced motions at Reynolds number Re = 20000. The transverse amplitude and the Strouhal number of the offshore floater are validated against the experimental data.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket