摘要
采用求解RANS方程的方法,结合RNG k-ε湍流模型,对于某潜艇模型近海底和近水面绕流进行了数值模拟。计算了不同海底深度下潜艇模型的阻力、垂向力和俯仰力矩,也计算了同一海底深度下潜艇阻力随傅氏数的变化,研究表明当海底深度超过二分之一艇长时,海底对阻力的影响可忽略不计。自由液面捕捉采用VOF(Volume of Fluid)方法。计算了不同浸深下潜艇模型的阻力和自由液面波型,同时又研究了同一浸深下阻力和波型随傅氏数的变化趋势。研究表明,当浸深超过三分之一艇长时,自由液面波高迅速减小,自由液面对阻力的影响可忽略不计。计算结果与试验结果吻合较好。
The flow around submarine operating close to the bottom or near surface were numerically simulated by solving RANS equations with RNG k-ε turbulence model.The resistance,vertical force and pitching moment of a submarine model at different depths of bottom were computed.And the change of resistance with Froude number was studied.It indicates that the bottom has a neglectable effect on resistance as long as the depth of bottom more than 1/2 submarine length.Free surface was captured with VOF（Volume of Fluid） method.So the resistance and wave pattern of a submarine model at different depths of submergence were computed.And the change of resistance and wave pattern with Froude number were investigated.It indicates that the free surface has a neglectable effect on resistance and wave pattern as long as the depth of submergence more than 1/3 submarine length.The comparison between the prediction and the model test measurement shows fairly good agreement.
出处
《船舶力学》
EI
北大核心
2007年第4期498-507,共10页
Journal of Ship Mechanics
关键词
计算船舶流体力学
潜艇
近水面
近海底
VOF
computational ship hydrodynamics
submarine
close to the bottom
near surface
VOF
