2D Sound Wave

2D Sound Wave

Shows the propagation of a sound wave through the grid. The test consists of a linear wave of amplitude 1e-4 on a background density of 1.0 and pressure of 0.6. Gamma is set to 1.666666666666667. This test is performed with the default hydro build (cholla/builds/make.type.hydro) and Van Leer integrator. Full initial conditions can be found in cholla/src/grid/initial_conditions.cppunder Sound_Wave()

Parameter file: (cholla/examples/2D/sound_wave.txt)

#
# Parameter File for sound wave test
#

################################################
# number of grid cells in the x dimension
nx=128
# number of grid cells in the y dimension
ny=128
# number of grid cells in the z dimension
nz=1
# final output time
tout=0.05
# time interval for output
outstep=0.01
# name of initial conditions
init=Sound_Wave
# domain properties
xmin=0.0
ymin=0.0
zmin=0.0
xlen=1.0
ylen=1.0
zlen=1.0
# type of boundary conditions
xl_bcnd=1
xu_bcnd=1
yl_bcnd=1
yu_bcnd=1
# path to output directory
#outdir=outputs/
outdir=./

#################################################
# Parameters for linear wave problems
# initial density 
rho=1.0
# velocity in the x direction 
vx=0
# velocity in the y direction
vy=0
# velocity in the z direction
vz=0
# initial pressure 
P=0.6
# amplitude of perturbing oscillations
A=1e-4
# value of gamma
gamma=1.666666666666667

Upon completion, you should obtain 6 output files. Here, we see the evolution of the density at 10 fps.