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Stern Form Optimization Aimed at Wake Uniformity
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FU Huiping，CHEN Zuogang
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(School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University,Shanghai 200240, China)
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Abstract Method of stern form optimization aimed at improvement of wake nonuniformity was researched. A 3 100 TEU container ship was taken as initial hull in the optimization process. Based on the module of Framework imbedded in the CFD code Friendship, the two modified afterbodies were created. The preprocessed code of FLUENT, GAMBIT, was used to produce the mesh. Based on the uniform mesh form, the flow fields around three hull forms were numerically simulated. Hydrostatic parameters, resistance coefficients and wakes were analyzed. Through the numerical feature of section shape, x-i, the degree of U, V shape of hull form was also analyzed. The results show that the larger the section number where the value of max(x-i) arise, the better the wake uniformity. From stern to bow, the section number increases. The value of x-i should be lower as it gets closer to the stern. By adapting the after body of hull to extreme U shape section, not only wake peak, wake gradient but also wake nonuniformity is improved apparently, while its resistance increases only 0.61%.
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Received: 30 December 2009
Published: 31 October 2010
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