中低速船底部断阶对流场和阻力的影响  

Influence of Flow Field and Resistance on a Stepped Bottom for Medium or Low Speed Craft

作　　者：魏玮[1] 王家楣[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《船海工程》2011年第3期30-32,36,共4页Ship & Ocean Engineering

基　　金：国家自然科学基金(10972167)

摘　　要：为分析断阶对船舶流场及阻力性能的影响,针对一条中低速船舶在断阶位置、断阶高度不同,不计自由面影响且船舶无攻角条件下,采用有限体积法和SIMPLEC算法,耦合求解Navier-Stokes方程和连续性方程。采用SSTk-ω两方程模型,压力采用标准格式;动量方程、雷诺应力封闭方程均采用二阶迎风格式。计算结果与原型船模的对比性分析显示:与原型船模相比,断阶导致船模总粘性阻力均略有增加,断阶位置下游一定范围内的船体壁面切应力以及压力系数均有所增加;断阶高度为船舶吃水的0.037 5%与0.025%相比,断阶高度小阻力增幅小;与14站处断阶相比,位于13站处的断阶方案的船模总阻力系数较大。To analyze the influence of flow field and resistance characteristics by step,the finite volume method and SIMPLEC algorithm were used to solve the Navier-Stokes equation and the continuity equation coupling for a medium/low speed craft under the condition of no angle of attack,with different stepped position and stepped height,neglecting the influence of free-surface.The SST viscous model was chosen,adopting standard format for pressure,taking second order upwind format for momentum and Reynolds stress closed equations.The numerical results showed： compared with the original craft model,the total viscous resistance increases in the stepped craft,and the wall shear stress and pressure coefficient enlarge under a certain range of the downstream of stepped position.Compared the stepped height of ship draft off 0.0375% with 0.025%,the amplification of resistance is smaller while choose minor stepped height.Compared with the situation stepped at the 14 station,the total resistance coefficient is larger when stepped at the 13 station.

关 键 词：船舶 断阶 阻力 压力分布 数值模拟 

分 类 号：U661.1[交通运输工程—船舶及航道工程]