Visit us at the Monaco Yacht Show (September 22-25) to further discuss how CFD can help to optimize your yacht design process. Stand QS75
Courtesy René van der Velden Yacht Design
Several applications Streamlines around the bow tunnel can be used to judge
the necessity and orientation of a scallop, grid or spoiler. The flow lines around the bilge can be rather speed- dependent, especially when sailing at high Froude numbers. The streamlines‘ speed dependency are to be taken into account when placing the bilge keels and determining the neutral angle of fin stabilisers. The speed-dependent neutral orientation of fin stabilisers may be taken account in the control system on the bridge. In certain cases it is relevant to determine the interactions between the bilge keels and fin stabilisers or other appendages with a full viscous CFD analysis in order to avoid degradation of roll damping and/or noise and vibrations sources for instance.
Shaft brackets give an undesired wake peak in the propeller plane. This may lead to undesired noise and erosion if the alignment is not perfect, especially when sailing at higher speeds and propeller loading. The mini- mum drag orientation or twist of the streamlined brackets can be determined when taking the contribution of the propeller action into account. On the other hand, the so-called nominal wake field can be derived and this is an input for propeller design. A coupling of MARIN’s PROCAL and Excalibur software gives our specialists the functionality to custom-design a propeller while control- ling cavitation and pressure pulses.
3D model René van der Velden, streamlines in blue 2000
Model tests for ‘Queen Mary II’ with 20 MW pod
2001
Opening new Offshore Basin and Seakeeping & Manoeuvring Basin
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