Exact(2)
High root mean square fluctuating particle velocities are observed at the solids jet boundaries.
Generally, the primary mixing was observed to occur after the location of the Mach disk and particularly close to the jet boundaries where large-scale turbulence played a dominant role.
Similar(58)
As to the contact discontinuity at the 2D jet boundary, the situation is not that trivial.
The white contour shows the jet boundary, located using the passive scalar.
The plots in Figure 3 also reveal a thin layer of decreased entropy stretching along the jet boundary.
It reaches the axis at (zapprox400), gets reflected and then returns to the jet boundary at (zapprox700) (see Figure 6).
As the jet boundary jumps from one cell to another, a low level noise is introduced to this integral variable.
After the reset, the 1D jet boundary is no longer a contact but a more general discontinuity.
In the very beginning, the decrease of external pressure makes the jet under-expanded and a rarefaction wave is launched from the jet boundary towards the jet axis.
Assuming particular flow profiles in the shocked layer, one can also determine the location of the jet boundary (e.g. Bromberg and Levinson 2007).
For 2D supersonic flows we need to fix all flow parameters at the jet inlet and impose some conditions at the jet boundary, consistent with it being a stationary contact wave.
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