Marine

CFD simulations of ships in high waves

With a growing competition in the marine industry, it is of great importance to have efficient methods of assessing new products. Hull design has traditionally relied on extensive model testing, but recent decades have shown that computational fluid dynamics (CFD) is a useful tool to reduce project costs and lead times. Since CFD simulations of a new hull geometry can be set up and run in a few days, they can play an important role in finding the right balance between parameters such as calm water resistance, propeller-hull interaction and seakeeping ability.

Hydrodynamics of drilling riser buoyant joints

Offshore drilling is commonly performed with a top-tensioned drilling riser system. Operational uptime of the system is estimated through a global riser analysis, with input of hydrodynamic coefficients assumed by treating riser joints as circular cylinders. This is not accurate because the system consists mainly of buoyant riser joints with complex cross-sections. Buoyant joints have a generally circular shape but also have MUX recesses and stacking flats forming its outer profile. These surface features change its flow behaviour and hydrodynamic performance.

Validation and application for semi-planing crafts

In recent years, the Office of Naval Research of the United State Navy has initiated a specific task aiming to accurately predict dynamic ship response and impact loads through two-phase computational fluid dynamic (CFD) simulations for use in improving semi-planing ship design. As with proper CFD practices, validation must be shown before the computed pressure and impact loads can be used in the structural analysis of the ship.

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