轴对称山丘跨音速绕流的Morphing连续介质模拟
A Morphing Continuum Simulation of Transonic Flow over an Axisymmetric Hill
摘要：
采用变形连续统理论（MCT）对$Re_H$ = 6500的轴对称山丘湍流边界层流动进行了有限体积模拟，并与Castagna等人的DNS数据进行了比较。实验数据来自Simpson。通过输入Castagna et.使用来自MCT的新的回转变量输入均方根速度波动。MCT引入的附加项导致了Q准则的新表述，它允许包括发夹涡在内的三维湍流结构的可视化。分离气泡的流线图显示出比Castagna等人更封闭的气泡。例如，但在分离点和重连点上很一致。表面压力系数匹配辛普森比Castagna等更密切。MCT数据是在含有比Castagna et.粒子对较大结构的影响可以从新的回转变量的变化中推断出来。
英文摘要：
Finite volume simulations of turbulent boundary layer flow over an axisymmetric hill are performed for $Re_H$ = 6500 using Morphing Continuum Theory (MCT), and compared with DNS data from Castagna et. al. and experimental data obtained by Simpson. The inlet profile was specified by inputting values from the profile specified by Castagna et. al. Root- mean-square velocity fluctuations are inputted using the new variable of gyration from MCT. Additional terms introduced by MCT lead to a new formulation of the Q-criterion, which allows for the visualization of three-dimensional turbulent structures including a hairpin vortices. Streamline plots of the separation bubble show a more confined bubble than Castagna et. al., but agree well on the separation and reconnection points. The surface pressure coefficient matches Simpson much more closely than Castagna et. al. MCT data was obtained on a $6.72 \times 10^6$ cell mesh containing a smaller number of cells by an order of magnitude than that of the DNS mesh of $5.4 \times 10^7$ by Castagna et. al. The effects of the particle on the larger structures are inferred from the variation in the new variable of gyration.
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