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Numerical Framework for Marine/Offshore Applications

Our group has developed high-fidelity computational framework for multiphase fluid dynamics and fluid-structure interaction (FSI) simulations in marine and offshore engineering applications. Additional techniques implemented include interface-capturing level-set method for free-surface motion, that may include wave breaking and other topological changes, homogeneous mixture model for turbulent cavitating flows, efficient and robust coupling strategies and scalable HPC implementation. The stabilized and multi-scale formulation is used for the fluid mechanics and level-set equations. The underlying numerical formulation globally conserves mass and preserves a sharp air–water interface for the entire length of the simulation.

Computational fluid dynamics simulation of multiple full-scaled vertical-axis hydrokinetic turbines.

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Computational fluid dynamics simulation of INSEAN E779A Propeller. Left to right: 

For FSI problems, an advanced structural modeling techniques based on Isogeometric Analysis (IGA) is employed. The bending-stabilized cable formulation is used to model mooring cables. 

The framework is suitable for accurate prediction of wave loading on a structures (submarine, ships, floating platforms, etc), prediction of the onset and development of cavitation on hydrofoils and propellers, simulation of turbine arrays (layout optimization and wake-structure interaction), stability analysis under different sea conditions, parametric optimization, air-wave-structure interaction.

Hydrodynamic simulation of Mirage Drive propulsion system based on two oscilating flexible foils (Collaboration with Hobie Cat).

Free-surface hydrodynamic simulation of tidal stream turbine in Airy waves.