摘要
湍流阻力在流体运输、航空和航海等领域广泛存在,是管道、常规运输机、水上船只、潜艇和机翼等与粘性流体接触的工作部件的主要能耗来源。文章利用有限体积法对26种三角形仿生非光滑沟槽表面流场进行了数值计算。近壁面区采用B-L两层模型,外区采用雷诺应力模型。通过与油槽实验数据定性对比,验证了数值模拟沟槽非光滑表面减阻的精度及可靠性,为软件模拟非光滑壁面流场提供依据。同时还对7种压力梯度下沟槽表面流场进行模拟,研究了压力梯度对减阻效果的影响。
Turbulent drag exists in the flow transport, aviation and navigation fields and is the most energy consumation. Twenty-six flow field over triangle riblet with α=60°, s=0. 1mm and h=8.66×10^-2mm are computed with finite volume method in single computational domain.B-L model in near wall and RSM （Reynolds stress model） are applied. Reliability and precision of simulation can be proved because the simulation result is in good agreement with existing experimental data and with theory computation rcsult, which provides feasibility for simulating flow field over biomimetic non-smooth surface with software.In addition,numerical simulations of turbulent flow over riblet surface are carried out in 7 kinds of pressure gradients.The effect of pressure gradient is analyzed.
出处
《船舶力学》
EI
北大核心
2006年第5期11-16,共6页
Journal of Ship Mechanics
基金
国家科技合作重点项目计划(2005DFA00850)
国家教委博士基金(20040183048)
吉林省科技发展计划重点项目(高技术)(20040331)
关键词
减阻
沟槽
仿生非光滑
数值分析
流场
drag reduction
riblets
bionic non-smooth
numerical simulation
flow field
