Interaction of a Mach 1.2 Shock with Two SF6 Cylinders
Vikram Dwarkadas, Greg Weirs and Tomek Plewa
This page shows simulations from the interaction of a shock with a
cylinder of gas. The cylinders are composed of Sulphur Hexafluoride
(SF6). The rest of the shocktube is filled with air. A shock of Mach
number 1.2 is introduced into the shock tube and allowed to impact the
cylinder. The experiment was carried out at Los Alamos National
Lab. Experimental setup is shown here (PDF
File) . Simulations were carried out with the FLASH code, Version
2.3, at the ASCI FLASH Center. The PPM method, without steeping, was
used. Refinement was done on the first rather than second derivatives
(which is the default for FLASH). The calculations included 2 fluids,
air and SF6.
Questions to be answered
Do the simulations converge with increasing level of resolution?
Is this convergence reflected in both external appearance as well as
diagnostics such as velocity, concentration etc?
The results below show density snapshots of the evolution of the
cylinder cross-section. Clicking on the images or the "density" and
other links will bring up animated 'gif' movies.
Case 1
The initial conditions (volume concentration through a
cross-section of the cylinder) are shown here
(GIF image)
Case 2
The initial conditions (volume concentration through a
cross-section of the cylinder) are shown here
(GIF image)
Case 3
The initial conditions (volume concentration through a
cross-section of the cylinder) are shown here
(GIF image)
vikram@flash.uchicago.edu
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
Density 
