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Research on Bulbous Bow Optimization Based on the Improved PSO Algorithm

China Ocean Engineering 2017年第4期31卷 487-494页

作者： ZHANG Sheng-long ZHANG Bao-ji Tahsin TEZDOGAN XU Le-ping LAI Yu-yang Merchant Marine College Shanghai Maritime University Shanghai 201306 China College of Ocean Environment and Engineering Shanghai Maritime University Shanghai 201306 China Department of Naval Architecture & Ocean and Marine Engineering University of Strathclyde Glasgow G4 0LZ UK Beijing Soyotec Co. Ltd. Beijing 100062 China

In order to reduce the total resistance of a hull, an optimization framework for the bulbous bow optimization was presented. The total resistance in calm water was selected as the objective function, and the overset mesh technique was used for mesh generation. RANS method was used to calculate the total resistance of the hull. In order to improve the efficiency and smoothness of the geometric reconstruction, the arbitrary shape deformation （ASD） technique was introduced to change the shape of the bulbous bow. To improve the global search ability of the particle swarm optimization （PSO） algorithm, an improved particle swarm optimization （IPSO） algorithm was proposed to set up the optimization model. After a series of optimization analyses, the optimal hull form was found. It can be concluded that the simulation based design framework built in this paper is a promising method for bulbous bow optimization.

关键词： bulbous bow overset mesh RANS method ASD technique IPSO algorithm

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Effects of Heaving Motion on the Aerodynamic Performance of a Double-Element Wing in Ground Effect

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Fluid Dynamics & Materials Processing 2020年第6期16卷 31-52页

作者： Ioannis Oxyzoglou Zheng-Tong Xie Faculty of Engineering and Physical Sciences University of SouthamptonSouthamptonSO171BJUK

The broad implication of the paper is to elucidate the significance of the dynamic heaving motion in the aerodynamic performance of multi-element wings,currently considered as a promising aspect for the improvement of the aerodynamic correlation between CFD,wind tunnel and track testing in race car *** relationship between the varying aerodynamic forces,the vortex shedding,and the unsteady pressure field of a heaving double-element wing is investigated for a range of mean ride heights,frequencies,and amplitudes,using a two-dimensional(2D)unsteady Reynolds-averaged Navier-Stokes(URANS)approach and an overset mesh method for modelling the moving *** analysis of the results shows that at high frequencies,i.e.,k≥5.94 and amplitudes a/c≥0.05 the interaction of the shear vorticity between the two elements results in the generation of cohering leading and trailing edge vortices on the flap,associated to the rapid variation of thrust and downforce *** the occurrence and intensity of these vortices are dependent upon the frequency,amplitude,and mean ride height of the heaving *** addition of the flap significantly alters the frequency of the shed vortices in the wake and maintains the generation of downforce for longer time in ground *** comparison with the static wing provides evidence that the dynamic motion of a race car wing can be beneficial in terms of performance,or detrimental in terms of aerodynamic correlation.

关键词： CFD URANS aerodynamics heaving wing multi-element wing vortex shedding ground effect downforce overset mesh race car

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Numerical Modeling of an Advanced Semi-SWATH Hull in Calm Water and Regular Head Wave

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Journal of Marine Science and Application 2021年第4期20卷 646-659页

作者： Arman Zare Hassan Sayyadi Mohammad Hossein Karimi Department of Mechanical Engineering Sharif Universityof TechnologyTehran 11155-9567Iran Department of Mechanical and AerospaceEngineering Malek-Ashtar University of TechnologyEsfahan 1774-15875Iran

A small waterplane area twin hull(SWATH)has excellent seakeeping performance and low wave-making resistance,and it has been applied to small working craft,pleasure boats,and unmanned surface ***,with the increase in speed,the hydrodynamic resistance of SWATH will increase exponentially because of its large wet surface,followed by the uncomfortable situation of the hull underwater part relative to the water level and in terms of high trim by stern and high sinkage.A way to improve this situation is to reduce the depth of the draft at high speeds to ensure that all or a part of the volume of the submerged bodies is above the water *** on this idea,a new type of semi-SWATH hull form was analyzed in this *** two submerged bodies of the SWATH have a catamaran boat *** paper employed Sie-mens PLM Star-CCM+to study the hydrodynamic performance of an advanced semi-SWATH ***-hull resistance was estimated for both SWATH and CAT(CATAMARAN)modes in calm ***,the efect of fxed stabilizing fns with diferent angles on the vertical motions of the vessel in regular head waves was investigated with an overset mesh *** vertical motion responses were estimated at diferent wave encounter frequencies,and the present numerical method results have been verifed by already published experimental data.

关键词： Seakeeping performance Semi-SWATH Stabilizing fns Vertical motions overset mesh

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