Numerical simulation of compressible mixing layers

• Published in: International journal of heat and fluid flow 2006-10, Vol.27 (5), p.895-901
• Main Authors: Fu, Song, Li, Qibing
• Format: Article
• Language: English
• Subjects: Budget of transport equation; Compressibility; Compressible flows; shock and detonation phenomena; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); General subsonic flows; Numerical simulation; Physics; Shocklets; Spatially developing mixing layer; Turbulence simulation and modeling; Turbulent flows, convection, and heat transfer
• ISSN: 0142-727X; 1879-2278
• DOI: 10.1016/j.ijheatfluidflow.2006.03.028

Three-dimensional spatially developing compressible planar mixing layers are studied numerically for convective Mach number M c = 0.4, 0.8 and 1.2. The present results for the flow-field structures, the mean velocity profiles, the mixing-layer growth rate and Reynolds stresses agree well with those of experiments and other numerical studies. The normalized growth rate decreases with increasing M c. Shocklets are found to exist in the mixing layer at M c = 1.2 and their formation mechanism shows good agreement with the scenario of flow around a bluff body. The effect of compressibility on the large-scale structures is stronger than that on the small-scale ones. The budget of the Reynolds-stress transport equations agree well with that from the temporal developing results. The magnitudes of most of the contributing terms in the budget reduce with increased compressibility effect except for the pressure-dilatation term which is very small.