基于密度分域的混合湍流模型的应用与评价

结合数值计算和实验结果评价了一种基于密度分域的混合湍流模型.实验采用高速录像和LDV测量技术观察了绕Clark-y型水翼云状空化随时间的流场结构变化和速度分布.数值模拟中,基于非定常空化的流动现象,建立了一种基于密度分域的混合湍流模型,并分别应用不同的湍流模型计算了绕水翼非定常云状空化流动.通过与实验结果的对比表明,分域湍流模型能够更好地调整流场内的湍流黏性,精确捕捉到空穴形态和空泡脱落的非定常细节,时均流场速度分布与实验值基本吻合.

Assessment of a Density Modify Based Turbulence Closure for Unsteady Cavitating Flows

To assess a density modify based turbulence model,the unsteady cloud cavitating flow around a Clark-y hydrofoil is investigated by coupled experimental and numerical methods.A high speed camera is used to visualize the flow structures,and laser Doppler velocity(LDV)is employed for velocity measurement.The numerical simulations are conducted on the two dimensional hydrofoil section,the different turbulence models including the density modify based turbulence model are used for computation.It is shown that th...