FBM湍流模型在非定常通气超空化流动计算中的评价与应用  

Evaluation of the filter-based turbulence model(FBM) for computation of unsteady ventilated-supercavitating flows

作　　者：时素果[1] 王国玉[1] 余志毅[1] 张敏弟[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《船舶力学》2012年第10期1099-1106,共8页Journal of Ship Mechanics

基　　金：国家自然科学基金项目资助(50979004);高校博士点基金(20080070027)

摘　　要：为了建立通气超空化流动计算的流动模型,应用二次开发技术将FBM湍流模型嵌入商业软件,分别采用FBM湍流模型以及商业软件中的标准k-ε湍流模型模拟了绕圆盘空化器的通气空化流场,并从空泡形态、流动结构和阻力特性等方面与试验结果进行了对比。结果表明,标准k-ε湍流模型过高预测了流场的湍流粘性,预测的空泡形态和实验观测结果有较大的差距;采用滤波器湍流模型计算,可以明显地减小通气空泡尾端流场的湍流黏性,精确地捕捉通气空化区域空泡脱落的非定常细节,更加准确地描述通气空化的过程,与试验结果更加接近。In order to investigate the flow model for the ventilated-supercavitating flows, the filter-based turbulent model （FBM） is introduced to a commercial software. The ventilated-cavitation flows around a disc cavitator are numerically simulated by using the software with FBM and the standard k-e turbulent model respectively. Comparison with experimental results shows that there is obvious effects on the numer- ical results for the turbulent models. The high eddy viscosity predicted by the standard k-6 turbulent model dampens the vortex shedding motion and excessively attenuates the cavitation instabilities. FBM turbulent model can capture the unsteady bubble shedding structure, since the model simulates the eddy viscosity more accurately.

关 键 词：通气空化 湍流模型 FBM 湍流粘性 

分 类 号：TV131.3[水利工程—水力学及河流动力学]