Multi Hull Flow Visualization
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Multi-hull Flow Visualization
The trimaran is a hull form that has potential application for high-speed sealift vessels. This hull form has less drag, larger deck area, and greater stability than a monohull designed for the same mission. However, much is unknown about the hydrodynamic characteristics of multiple hulls. The objective of this study was to explore innovative techniques for qualitatively visualizing flow that could provide insight to aid designers. The areas of concentration were flow on the surface of the hulls and throughout the fluid in the vicinity of the hulls, pressures on the hulls, and wakes between the hulls. The requirements were that the techniques must be safe, affordable, compatible with the model basins at the Naval Surface Warfare Center Carderock Division, and not interfere with other testing. These techniques would also be used to validate predictions made by Computational Fluid Dynamics software. After an analysis of the effectiveness and comparative cost of several methods, it was concluded that the best technique for visualizing the flow on the surface of the hulls is boiled linseed oil mixed with artist's paint. Particle Image Velocimetry is the recommended method for visualizing flow around the hulls. For assessing the pressures on the hulls and the wakes between the hulls, shear and pressure sensitive films from Innovative Scientific Solutions, Inc. appeared the most promising, although more development is still required.
Multi-Hull Flow Visualization: An Investigation of Flow Visualization Techniques for Trimaran Hulls
The trimaran is a hull form that has potential application for high-speed sealift vessels. This hull form has less drag, larger deck area, and greater stability than a monohull designed for the same mission. However, much is unknown about the hydrodynamic characteristics of multiple hulls. The objective of this study was to explore innovative techniques for qualitatively visualizing flow that could provide insight to aid designers. The areas of concentration were flow on the surface of the hulls and throughout the fluid in the vicinity of the hulls, pressures on the hulls, and wakes between the hulls. The requirements were that the techniques must be safe, affordable, compatible with the model basins at the Naval Surface Warfare Center Carderock Division, and not interfere with other testing. These techniques would also be used to validate predictions made by Computational Fluid Dynamics software. After an analysis of the effectiveness and comparative cost of several methods, it was concluded that the best technique for visualizing the flow on the surface of the hulls is boiled linseed oil mixed with artist's paint. Particle Image Velocimetry is the recommended method for visualizing flow around the hulls. For assessing the pressures on the hulls and the wakes between the hulls, shear and pressure sensitive films from Innovative Scientific Solutions, Inc. appeared the most promising, although more development is still required.
Hydrodynamics VI: Theory and Applications
The International Conference on Hydrodynamics is an increasingly important event at which academics, researchers and practitioners can exchange new ideas and their research findings. This volume contains papers from the 2004 conference covering a wide range of subjects within hydrodynamics, including traditional engineering, architectural and mecha