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Temporal evolution of the mixing layer momentum thickness for DG at Mc = 0.1/1.1/2.2.

Temporal evolution of the mixing layer momentum thickness for DG at Mc = 0.1/1.1/2.2.

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The present article investigates the effects of a BZT (Bethe-Zel'dovich-Thompson) dense gas (FC-70) on the development of turbulent compressible mixing layers at three different convective Mach numbers Mc = 0,1; 1,1 and 2,2. This study extends previous analysis conducted at Mc = 1,1 (Vadrot et al. 2020). Several 3D direct numerical simulation (DNS)...

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Context 1
... previously done for the perfect gas mixing layer, it is required to precisely define the self-similar range for the dense gas flow. This is done through both figures 6 and 7. Figure 6 of initial turbulent structures does not influence the growth rate during self-similarity. This choice was motivated by the will to shorten the simulation. ...
Context 2
... the size of initial turbulent structures accelerates the unstable growth phase. As a consequence, in figure 6, M c = 1.1 and M c = 2.2 curves overlap after τ ≈ 2500. Slopes and standard deviation computed over the self-similar range are given in figure 6. ...
Context 3
... a consequence, in figure 6, M c = 1.1 and M c = 2.2 curves overlap after τ ≈ 2500. Slopes and standard deviation computed over the self-similar range are given in figure 6. At M c = 0.1, because of the suppression of compressibility effects, growth rate is very close to that of PG flow: the difference is about 1.5% and is below the standard deviation range. ...
Context 4
... M c = 1.1, comparison between DG and PG flows is detailed in Vadrot et al. (2020) during unstable growth and self-similar phases. Figure 6 shows that the momentum thickness growth rates are very close between M c = 2.2 and M c = 1.1 unlike the perfect gas case. The well-known decrease of the growth rate with the convective Mach number is modified by dense gas effects. ...
Context 5
... provided in figure 6 are determined using the same methodology used for PG in section 3.1. For each convective Mach number, the non-dimensional integrated turbulent production term P * int is plotted over time. ...

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