|Series||NMI report -- R151|
|Contributions||National Maritime Institute.|
Hull form optimization from a hydrodynamic performance point of view is an important aspect of ship design. This paper presents a computational method to estimate the ship resistance (viscous and. INTRODUCTION r ~7 ~~ ¢ ~ ~ In optimization of ship hull form, we often optimize in such a way that the wave resistance takes the minimum value, because the wave resistance theory based on potential theory doesn't require much computational cost. The hull form design and its optimization are based on the systematic variation of the longitudinal distribution of the hull volume, while the vertical volume distribu-tion is fixed or highly controlled. Such design process is underpinned with the respective data analysis of the obtained results, which are presented as the optimum distribution File Size: 1MB. To reduce the ship wave-making resistance, the lines of the bulbous bow of a hull are optimized by an automatic optimization platform at the ship design stage. Parametric modeling was applied to the hull by using non-uniform rational basis spline (NURBS). The Rankine-source panel method was used to calculate the wave-making resistance. A hybrid optimization strategy was Cited by: 2.
In this article the problem of ship hull shape improvement for reduced drag is described from the viewpoint of mathematical optimization. The approach concentrates on methods of shape variation and flow analysis by Computational Fluid Dynamics. This still evolving methodology will be illustrated by a few examples of hydrodynamic by: 2. As shown in Fig. 1, total hull resistance is divided into wave resistance and viscous resistance. The present study ignores the effect of wave resistance on optimization process. Download: Download high-res image (KB) Download: Download full-size image; Fig. 1. The components of total hull by: 1. Ralph Baker Optimization of the length of a Surf Ski Kayak MAR An example of a graph showing the total viscous resistance The viscous resistance (pink) and frictional resistance (blue) follow exactly the same path in this because the other factor in viscous resistance which comes from form factor is neglected. This book discusses the problem of optimizing ship’s hulls, highlighting the key technologies of ship optimization design and presenting a series of hull-form optimization platforms. It includes several improved approaches and novel ideas with significant potential in this field wave resistance mesh minimum numerical
Vast research is being done in hydrodynamics to reduce power by modifying the ship hull form and its optimization requires a lot of skill and knowledge about many aspects like the pressure distribution, components of resistance and sea state. Viscous resistance and wave making resistance mainly. Xie L, Feng BW, Liu ZY () Automatic optimization of high-speed hull forms using CFD. J Huazhong Univ Sci Tech (Ntl Sci Edition), 39(6): – Google Scholar Shape optimization is a very time-consuming and expensive task, especially if experimental tests need to be performed. To overcome the challenges of geometry optimization, the industry is increasingly relying on numerical simulations. These kinds of problems typically involve the interaction of three main applications: a solid modeler, a multi-physics solver, and an by: 3. Application to Michell’s wave resistance Conclusion About the optimization problem for ω ﬁxed 1st idea: ﬁnding a ship of minimal wave resistance among admissible functions f: ω → R+, for a constant speed U and a given volume V of the hull. f 7→R Michell(f) is a positive semi-deﬁnite quadratic functional, but.