混合湍流模型的参数优化与分析

发布时间：2018-02-04 05:39

本文关键词： 混合湍流模型代理模型整体敏感度参数优化　出处：《船舶力学》2016年07期 　论文类型：期刊论文

【摘要】：在以全流场N-S方程为研究对象的空化流动数值计算中,湍流模型在很大程度上影响了对空化流动的精确预测。为了进一步完善针对非定常空化流动数值计算构建的基于密度分域的混合湍流模型(FBDCM),利用代理模型方法对FBDCM模型参数的整体敏感度进行了分析,评价了相关经验系数的扰动对空化流场及水动力特性预测精确度的影响,建议了针对非定常空化流动计算的模型参数的具体取值。结果表明,经验系数C2通过调节FBDCM中FBM模型和DCM模型的影响比重,成为对模型预测精度影响程度最大的因素;通过代理模型优化分析确定经验系数的混合湍流模型,能更好地调整流场内的湍流粘性,精确计算了反向射流区域大尺度涡团的流动,与实验结果更为接近。
[Abstract]:In the calculation of cavitation flow numerical research object in the whole flow field of N-S equation, turbulence model of accurate prediction for cavitation flow to a great extent. In order to further improve the unsteady cavitating flow numerical calculation of mixed density turbulence model based on domain construction (FBDCM), using the method of whole agent model on the FBDCM model the parameter sensitivity analysis, evaluation of the accuracy of disturbance experience coefficient of cavitation flow and hydrodynamic performance prediction, the specific values of model parameters for the unsteady calculation of cavitating flow is proposed. The results show that the empirical coefficient of C2 by influencing the regulation of FBDCM in FBM model and DCM model as the proportion of factors the influence degree of accuracy prediction of the model; through the agent model optimization analysis to determine the hybrid turbulence model empirical coefficient, can better adjust the turbulent viscous flow in The flow of large scale vortices in the reverse jet region is calculated accurately, which is closer to the experimental results.

【作者单位】：北京理工大学机械与车辆工程学院;
【基金】：国家自然科学基金项目资助(50979004) 国家重点自然科学基金项目资助(51239005)
【分类号】：O357.5
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