摘要:
基于综合集成技术,利用iSIGHT优化设计平台集成流体力学数值仿真软件Fluent,探索了V型减阻肋条最优夹角设计方法。采用雷诺平均N-S方程+RNGk-ε湍流模型的方法对V型减阻肋条进行数值模拟研究,在数值模拟过程中,针对V型减阻肋条的流场特性,对其计算模型、计算网格及其边界条件进行了合理化的处理。基于最小阻力建立了减阻肋条夹角的优化设计模型,采取自适应模拟退火算法全局搜索和序列二次规划局部寻优的二阶段组合优化方案,对V型减阻肋条夹角进行优化设计。结果表明:优化设计后,V型减阻肋条表面阻力减小,相对减阻量达到5.5%,减阻效果相对初始值有了很大改善,为V型减阻肋条最优夹角设计提供了一个新的方法。
Abstract:
Based on comprehensive integration technology,the method for optimal design of V-riblets angle was explored using iSIGHT optimal design platform integrated with fluid dynamics simulation software Fluent.Using Reynolds Averaged N-S formula and RNGk-ε turbulence model,the riblets reduction characteristic was numerically simulated.According to the characteristics of the riblets,computational model,computational grid and boundary conditions were reasonably processed in the numerical simulation.Based on the least resistance,the optimal design model for reblets angle was established,and the reblets angle was optimally designed by adopting the two-stage combining optimal program of overall search based on adaptive simulated annealing algorithm and partial optimal search of sequential quadratic programming.The result shows that V-reblets drag decreases after the optimal design;the relative drag reduction reaches 5.5%;the drag-reducing effect of reblets are greatly improved compared with the initial value,which provides the optimal angle a new method for the optimal design of reblets.
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