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# Test consistency between galpy and NEMO
import os
import subprocess
import numpy
from galpy import potential
from galpy.orbit import Orbit
from galpy.util import conversion
def test_nemo_MN3ExponentialDiskPotential():
mn = potential.MN3ExponentialDiskPotential(normalize=1.0, hr=0.5, hz=0.1)
tmax = 3.0
vo, ro = 215.0, 8.75
o = Orbit([1.0, 0.1, 1.1, 0.3, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, mn, tmax, vo, ro)
return None
def test_nemo_MiyamotoNagaiPotential():
mp = potential.MiyamotoNagaiPotential(normalize=1.0, a=0.5, b=0.1)
tmax = 4.0
vo, ro = 220.0, 8.0
o = Orbit([1.0, 0.1, 1.1, 0.3, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, mp, tmax, vo, ro)
return None
def test_nemo_NFWPotential():
np = potential.NFWPotential(normalize=1.0, a=3.0)
tmax = 3.0
vo, ro = 200.0, 7.0
o = Orbit([1.0, 0.5, 1.3, 0.3, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, np, tmax, vo, ro)
return None
def test_nemo_HernquistPotential():
hp = potential.HernquistPotential(normalize=1.0, a=3.0)
tmax = 3.0
vo, ro = 210.0, 7.5
o = Orbit([1.0, 0.25, 1.4, 0.3, -0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, hp, tmax, vo, ro)
return None
def test_nemo_PowerSphericalPotentialwCutoffPotential():
pp = potential.PowerSphericalPotentialwCutoff(normalize=1.0, alpha=1.0, rc=0.4)
tmax = 2.0
vo, ro = 180.0, 9.0
o = Orbit([1.0, 0.03, 1.03, 0.2, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, pp, tmax, vo, ro)
return None
def test_nemo_LogarithmicHaloPotential():
lp = potential.LogarithmicHaloPotential(normalize=1.0)
tmax = 2.0
vo, ro = 210.0, 8.5
o = Orbit([1.0, 0.1, 1.1, 0.3, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, lp, tmax, vo, ro, tol=0.03)
return None
def test_nemo_PlummerPotential():
pp = potential.PlummerPotential(normalize=1.0, b=2.0)
tmax = 3.0
vo, ro = 213.0, 8.23
o = Orbit([1.0, 0.1, 1.1, 0.3, 0.1, 0.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, pp, tmax, vo, ro, tol=0.03)
return None
def test_nemo_MWPotential2014():
mp = potential.MWPotential2014
tmax = 3.5
vo, ro = 220.0, 8.0
o = Orbit([1.0, 0.1, 1.1, 0.2, 0.1, 1.4], ro=ro, vo=vo)
run_orbitIntegration_comparison(o, mp, tmax, vo, ro, isList=True)
return None
def run_orbitIntegration_comparison(orb, pot, tmax, vo, ro, isList=False, tol=0.01):
# Integrate in galpy
ts = numpy.linspace(0.0, tmax / conversion.time_in_Gyr(vo, ro), 1001)
orb.integrate(ts, pot)
# Now setup a NEMO snapshot in the correct units ([x] = kpc, [v] = kpc/Gyr)
numpy.savetxt(
"orb.dat",
numpy.array(
[
[
10.0**-6.0,
orb.x(),
orb.y(),
orb.z(),
orb.vx(use_physical=False) * conversion.velocity_in_kpcGyr(vo, ro),
orb.vy(use_physical=False) * conversion.velocity_in_kpcGyr(vo, ro),
orb.vz(use_physical=False) * conversion.velocity_in_kpcGyr(vo, ro),
]
]
),
)
# Now convert to NEMO format
try:
convert_to_nemo("orb.dat", "orb.nemo")
finally:
os.remove("orb.dat")
# Integrate with gyrfalcON
try:
if isList:
integrate_gyrfalcon(
"orb.nemo",
"orb_evol.nemo",
tmax,
potential.nemo_accname(pot),
potential.nemo_accpars(pot, vo, ro),
)
else:
integrate_gyrfalcon(
"orb.nemo",
"orb_evol.nemo",
tmax,
pot.nemo_accname(),
pot.nemo_accpars(vo, ro),
)
finally:
os.remove("orb.nemo")
os.remove("gyrfalcON.log")
# Convert back to ascii
try:
convert_from_nemo("orb_evol.nemo", "orb_evol.dat")
finally:
os.remove("orb_evol.nemo")
# Read and compare
try:
nemodata = numpy.loadtxt("orb_evol.dat", comments="#")
xdiff = numpy.fabs((nemodata[-1, 1] - orb.x(ts[-1])) / nemodata[-1, 1])
ydiff = numpy.fabs((nemodata[-1, 2] - orb.y(ts[-1])) / nemodata[-1, 2])
zdiff = numpy.fabs((nemodata[-1, 3] - orb.z(ts[-1])) / nemodata[-1, 3])
vxdiff = numpy.fabs(
(
nemodata[-1, 4]
- orb.vx(ts[-1], use_physical=False)
* conversion.velocity_in_kpcGyr(vo, ro)
)
/ nemodata[-1, 4]
)
vydiff = numpy.fabs(
(
nemodata[-1, 5]
- orb.vy(ts[-1], use_physical=False)
* conversion.velocity_in_kpcGyr(vo, ro)
)
/ nemodata[-1, 5]
)
vzdiff = numpy.fabs(
(
nemodata[-1, 6]
- orb.vz(ts[-1], use_physical=False)
* conversion.velocity_in_kpcGyr(vo, ro)
)
/ nemodata[-1, 6]
)
assert xdiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for x by %g"
% xdiff
)
assert ydiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for y by %g"
% ydiff
)
assert zdiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for z by %g"
% zdiff
)
assert vxdiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for vx by %g"
% vxdiff
)
assert vydiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for vy by %g"
% vydiff
)
assert vzdiff < tol, (
"galpy and NEMO gyrfalcON orbit integration inconsistent for vz by %g"
% vzdiff
)
finally:
os.remove("orb_evol.dat")
return None
def convert_to_nemo(infile, outfile):
subprocess.check_call(
["a2s", "in=%s" % infile, "out=%s" % outfile, "N=1", "read=mxv"]
)
def convert_from_nemo(infile, outfile):
subprocess.check_call(["s2a", "in=%s" % infile, "out=%s" % outfile])
def integrate_gyrfalcon(infile, outfile, tmax, nemo_accname, nemo_accpars):
"""Integrate a snapshot in infile until tmax in Gyr, save to outfile"""
with open("gyrfalcON.log", "w") as f:
subprocess.check_call(
[
"gyrfalcON",
"in=%s" % infile,
"out=%s" % outfile,
"tstop=%g" % tmax,
"eps=0.0015",
"step=0.01",
"kmax=10",
"Nlev=8",
"fac=0.01",
"accname=%s" % nemo_accname,
"accpars=%s" % nemo_accpars,
],
stdout=f,
)
return None
|
