import sys
import numpy
from pyro.mesh import patch
from pyro.util import msg
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def init_data(my_data, base, rp):
""" initialize the bubble problem """
msg.bold("initializing the bubble problem...")
# make sure that we are passed a valid patch object
if not isinstance(my_data, patch.CellCenterData2d):
print("ERROR: patch invalid in bubble.py")
print(my_data.__class__)
sys.exit()
# get the density and velocities
dens = my_data.get_var("density")
xvel = my_data.get_var("x-velocity")
yvel = my_data.get_var("y-velocity")
eint = my_data.get_var("eint")
grav = rp.get_param("lm-atmosphere.grav")
gamma = rp.get_param("eos.gamma")
scale_height = rp.get_param("bubble.scale_height")
dens_base = rp.get_param("bubble.dens_base")
dens_cutoff = rp.get_param("bubble.dens_cutoff")
x_pert = rp.get_param("bubble.x_pert")
y_pert = rp.get_param("bubble.y_pert")
r_pert = rp.get_param("bubble.r_pert")
pert_amplitude_factor = rp.get_param("bubble.pert_amplitude_factor")
# initialize the components -- we'll get a pressure too
# but that is used only to initialize the base state
xvel[:, :] = 0.0
yvel[:, :] = 0.0
dens[:, :] = dens_cutoff
# set the density to be stratified in the y-direction
myg = my_data.grid
pres = myg.scratch_array()
j = myg.jlo
for j in range(myg.jlo, myg.jhi+1):
dens[:, j] = max(dens_base*numpy.exp(-myg.y[j]/scale_height),
dens_cutoff)
cs2 = scale_height*abs(grav)
# set the pressure (P = cs2*dens)
pres = cs2*dens
eint[:, :] = pres/(gamma - 1.0)/dens
# boost the specific internal energy, keeping the pressure
# constant, by dropping the density
r = numpy.sqrt((myg.x2d - x_pert)**2 + (myg.y2d - y_pert)**2)
idx = r <= r_pert
eint[idx] = eint[idx]*pert_amplitude_factor
dens[idx] = pres[idx]/(eint[idx]*(gamma - 1.0))
# do the base state
base["rho0"].d[:] = numpy.mean(dens, axis=0)
base["p0"].d[:] = numpy.mean(pres, axis=0)
# redo the pressure via HSE
for j in range(myg.jlo+1, myg.jhi):
base["p0"].d[j] = base["p0"].d[j-1] + 0.5*myg.dy*(base["rho0"].d[j] + base["rho0"].d[j-1])*grav
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def finalize():
""" print out any information to the user at the end of the run """