中国舰船研究2023，Vol.18Issue(6)：49-59,11.DOI:10.19693/j.issn.1673-3185.03103
船模阻力CFD/EFD预报的不确定度抑制方法
Uncertainty suppression methods for CFD/EFD resistance prediction of ship model
摘要
Abstract
[Objectives]This paper aims to study the influencing factors and mechanisms of ship model res-istance prediction uncertainty,as well as proposing corresponding suppression methods.[Methods]Resist-ance tests and local flow measurements on the flow around KCS models of 1.725 m and 3.450 m are carried out in a circulating water channel.The effects of the model scale on the resistance predictions are obtained by comparing the results of the two tests.Numerical simulations of the flow around the 3.450 m model in an un-bounded water area and circulating water channel are achieved.The results under the two conditions are com-pared to analyze the blockage effect and validate the simplified Tamura correction formula.Numerical simula-tions of the flow around the 3.450 m model under different turbulence intensities in a circulating water chan-nel are then carried out to analyze the effects of turbulence intensities on resistance predictions.[Results]The results show that the resistance prediction uncertainty of small ship models due to statistics collections and inflow uniformity can be amplified if the inflow velocity is too low.This demonstrates that the blockage effect of the large model could increase hull sinkage,pressure gradients on the hull and wave amplitudes,leading to an increase in ship resistance.The average difference between the resistances predicted in the unbounded wa-ter area and circulating water channel is 4.56%without correcting for the blockage effect.The difference is re-duced to 2.25%with the correction of the simplified Tamura formula.The total resistance increases by an av-erage of 3.75%as the turbulence intensity increases from 1%to 2%.It is observed that the decay of turbu-lence intensity along the flow direction is linear from the entrance to the bow.[Conclusions]This study shows that reasonably large models should be used wherever possible and the turbulence intensity should be strictly controlled to reduce the uncertainty of ship resistance tests in circulating water channels.In addition,the simplified Tamura formula should be used to correct the blockage effect,and the appropriate inflow turbu-lence intensity should be used in numerical prediction according to the dissipation of the turbulence intensity.关键词
循环水槽/不确定度/阻塞效应/湍流强度/阻力预报Key words
circulating water channel/uncertainty/blockage effect/turbulence intensity/resistance pre-diction分类
交通工程引用本文复制引用
丁子秦,代燚,陈作钢,冯榆坤..船模阻力CFD/EFD预报的不确定度抑制方法[J].中国舰船研究,2023,18(6):49-59,11.基金项目
海洋工程国家重点实验室基金资助项目(GKZD010080) （GKZD010080）
