摘要
为评价一种基于滤波函数湍流模型在非定常空化流动计算中的应用,分别采用基于标准RNGk-ε的滤波器模型(Filter based model,FBM)、修正RNGk-ε模型、基于修正RNGk-ε的FBM模型对绕Clark-y翼型云状空化流动进行模拟,研究云状空化流动现象,获得了随时间变化的空化形态、压力场和升、阻力等流场和动力特性。通过与试验结果的对比发现,不同湍流模型的选取对计算所得的空穴长度、压力场和升阻力均有影响,而对流场动力特性的主要频谱分布影响不明显。采用基于修正RNGk-ε的FBM模型可更准确的模拟出云状空化形态与空化区尾部涡团交替脱落的非定常细节。
To evaluate the application of the filter based model（FBM） in the simulation of cavitating flows,the cloud flow around the hydronautics foil is numerically simulated by using the filter based modified RNG k-ε、the standard RNG k-ε and the modified RNG k-ε models respectively.The time evolutions of the scales of cloud cavities,the lift and drag force of the hydrofoil are obtained and compared with experimental results.It is shown that the selection of different turbulence models has influence on the calculated cavity length,pressure field,lift and drag force significantly,but has no obvious influence on the main frequency distribution of flow field dynamic characteristic.Adopting FBM model based on modified RNG k-ε can more accurately simulate the cloud cavitation form and the details of cavitation shedding.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第8期147-153,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50979004)
关键词
滤波器模型
湍流模型
云状空化
脱落频率
Filter based model Turbulence model Cloud cavitation Shedding frequency
