Report
Here are the snapshots at different times for the 2 curtain problem.
The parameters are :
Mach number = 2.0
Resolution 800*160 ( Number of grids in y direction determine the resolution as always)
The distance between the two curtains is is twice the width of the curtains.
The curtains are light curtains with density ratio 0.14
It is fixed frame case

Density at t=0.3
Vorticity at t= 0.3

Density at t=0.5
Vorticity at t= 0.5

Colormap for vorticity
Colormap for density

Density at t=0.75
Vorticity at t=0.75

Density at t=1.0
Vorticity at t= 1.0

Density at t=1.5
Vorticity at t= 1.5

Density at t=2.0
Vorticity at t= 2.0
I have tried to keep the background same. But in the first two time steps it is a
bit different because of the magnitude of the vorticity is very much different. The case
looks fine with the vortex layer from the inclined surface of the second curtain not interacting
with the mushroom structure from first curtain very early on. We can see this at time t=0.75, the mushroom structure from the
first curtain is not affected by the vortex layer from the second curtain. I guess this case is
good but if yoou say , I can increase the separation between them.
The images can be saved by rigt clicking and saving the picture.