Spontaneous symmetry breaking in 1D shock front

[inducer]

@anderson2981 reports a 1D shock tube case meshed with structured tensor products that should obey $u(x,y)=U(x)$ for the life of the simulation, but it does not.

• ideal gas
• compressible
• with limiting
• $Q^5$

[anderson2981]

comparing pressure and temperature on 2 neighboring rows of cells. note the magnitude difference when moving to p5

p4 after 1000 steps

p5 after 1000 steps