Direct numerical simulation of compressible free shear flows
Direct numerical simulation of compressible free shear flows
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发表时间：
2003
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通讯作者：
S. K. Lele
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作者：
S. K. Lele
对开域内可压缩自由剪切层进行了直接数值模拟。数值模拟采用了具有类谱精度的紧致有限差分格式。对时间增长混合层和空间增长混合层进行了研究。研究了固有可压缩性对涡旋演化的影响。验证了对流马赫数的使用。对旋涡卷起和配对的细节进行了研究。对可压缩性的稳定作用作了简单的解释。研究和量化了涡旋卷起、涡对和形状振荡的声辐射。
Direct numerical simulations of compressible free shear layers in open domains are conducted. Compact finite-difference schemes of spectral-like accuracy are used for the simulations. Both temporally-growing and spatially-growing mixing layers are studied. The effect of intrinsic compressibility on the evolution of vortices is studied. The use of convective Mach number is validated. Details of vortex roll up and pairing are studied. A simple explanation of the stabilizing effect of compressibility is offered. Acoustic radiation from vortex roll up, pairing and shape oscillations is studied and quantified