We use our DG
to do some computation which aim is to predict the acoustic noise
and the recoil force of cannons with muzzle breaks. Here are some examples that I can
We have here an adaptive 2D computation
of a cannon blast.
That was our first attempt using isotropic mesh refinement.
We already have some anisotropic axisymmetric results (thanks
) with a small aspect ratio of 5. Those results, which show not so badly resolved shocks (we think ;-),
were computed on one pentium III machine in less that 2 hours, including 100 mesh refinements. The same
computation was taking 8 hours with the isotropic technique (and the results were not as good).
Pressure contours (left) and adapted meshes in the axi case
We are starting some non adaptive 3D cases. Here is a closup of the
cannon next to the muzzle break. The image shows velocity vectors
at an early stage of the computation.
Pressure contours (left) and velocity vectors (right) near the muzzle
of a 3D blast coming out
of a cannon,
taking ito account the ground.
This is a non-adaptive computation, I'm going to provide adaptive aniso images