import sys
import numpy
from pyro.mesh import patch
from pyro.util import msg
[docs]
def init_data(my_data, rp):
""" initialize the Gresho vortex problem """
msg.bold("initializing the Gresho vortex problem...")
# make sure that we are passed a valid patch object
if not isinstance(my_data, patch.CellCenterData2d):
print("ErrrrOrr: patch invalid in bubble.py")
print(my_data.__class__)
sys.exit()
# get the density and velocities
dens = my_data.get_var("density")
xmom = my_data.get_var("x-momentum")
ymom = my_data.get_var("y-momentum")
ener = my_data.get_var("energy")
# grav = rp.get_param("compressible.grav")
gamma = rp.get_param("eos.gamma")
# scale_height = rp.get_param("gresho.scale_height")
dens_base = rp.get_param("gresho.dens_base")
dens_cutoff = rp.get_param("gresho.dens_cutoff")
rr = rp.get_param("gresho.r")
u0 = rp.get_param("gresho.u0")
p0 = rp.get_param("gresho.p0")
# initialize the components -- we'll get a psure too
# but that is used only to initialize the base state
xmom[:, :] = 0.0
ymom[:, :] = 0.0
dens[:, :] = dens_cutoff
# set the density to be stratified in the y-direction
myg = my_data.grid
pres = myg.scratch_array()
dens[:, :] = dens_base
pres[:, :] = p0
x_centre = 0.5 * (myg.x[0] + myg.x[-1])
y_centre = 0.5 * (myg.y[0] + myg.y[-1])
rad = numpy.sqrt((myg.x2d - x_centre)**2 + (myg.y2d - y_centre)**2)
pres[rad <= rr] += 0.5 * (u0 * rad[rad <= rr]/rr)**2
pres[(rad > rr) & (rad <= 2*rr)] += \
u0**2 * (0.5 * (rad[(rad > rr) & (rad <= 2*rr)] / rr)**2 +
4 * (1 - rad[(rad > rr) & (rad <= 2*rr)]/rr +
numpy.log(rad[(rad > rr) & (rad <= 2*rr)]/rr)))
pres[rad > 2*rr] += u0**2 * (4 * numpy.log(2) - 2)
#
uphi = numpy.zeros_like(pres)
uphi[rad <= rr] = u0 * rad[rad <= rr]/rr
uphi[(rad > rr) & (rad <= 2*rr)] = u0 * (2 - rad[(rad > rr) & (rad <= 2*rr)]/rr)
xmom[:, :] = -dens[:, :] * uphi[:, :] * (myg.y2d - y_centre) / rad[:, :]
ymom[:, :] = dens[:, :] * uphi[:, :] * (myg.x2d - x_centre) / rad[:, :]
ener[:, :] = pres[:, :]/(gamma - 1.0) + \
0.5*(xmom[:, :]**2 + ymom[:, :]**2)/dens[:, :]
eint = pres[:, :]/(gamma - 1.0)
dens[:, :] = pres[:, :]/(eint[:, :]*(gamma - 1.0))
[docs]
def finalize():
""" print out any information to the userad at the end of the run """