CHOLLA_PM Test: Hydro Nyx Comparison
Updated DM-ONLY power spectrum:
The gravitational constant was different from the one in Nyx at the 5th digit, here are the new results, max differences are 0.25%
Gas Temperature:
Cholla gravWork : The energy update is \(\Delta E = dt \rho( v \cdot g)\)
Cholla deltaEk : The energy update is equal to the change in kinetic energy after the gravity update on the momentum.
Cholla uniform : Evolution of a uniform gas under adiabatic cosmological expansion, it follows the \((1+z)^2\) scaling expected for a \(\gamma = 5/3\) gas.
Density - Temperature Slices:
Panel 1: Evolution with Nyx.
Panel 2: Evolution with Cholla using same initial conditions as Nyx using the change in kinetic energy for the energy update.
Panel 3: Evolution with Cholla using same initial conditions as Nyx using \(\Delta E = dt \rho( v \cdot g)\) for the energy update.
Panel 4: Evolution with Enzo.
Panel 5: Evolution with Cholla using same initial conditions as Enzo using \(\Delta E = dt \rho( v \cdot g)\) for the energy update.