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Added pixel shifting in ICgen

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This commit is contained in:
Guilhem Lavaux 2014-06-04 09:13:34 +02:00
parent a82688b0b1
commit 7258dd20cb
4 changed files with 19 additions and 16 deletions
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3
python_sample/icgen/borgadaptor.py
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@ -6,9 +6,10 @@ def fourier_analysis(borg_vol):
return np.fft.rfftn(borg_vol.density)*(L/N)**3, L, N
def half_pixel_shift(borg):
def half_pixel_shift(borg, doshift=False):
dhat,L,N = fourier_analysis(borg)
if not doshift:
return dhat, L
ik = np.fft.fftfreq(N,d=L/N)*2*np.pi

10
python_sample/icgen/borgicgen.py
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@ -50,7 +50,7 @@ def compute_ref_power(L, N, cosmo, bins=10, range=(0,1), func='HU_WIGGLES'):
return bin_power(p.compute(k)*cosmo['h']**3, L, bins=bins, range=range)
def run_generation(input_borg, a_borg, a_ic, cosmo, supersample=1, do_lpt2=True):
def run_generation(input_borg, a_borg, a_ic, cosmo, supersample=1, do_lpt2=True, shiftPixel=False):
""" Generate particles and velocities from a BORG snapshot. Returns a tuple of
(positions,velocities,N,BoxSize,scale_factor)."""
@ -59,7 +59,7 @@ def run_generation(input_borg, a_borg, a_ic, cosmo, supersample=1, do_lpt2=True)
cgrowth = CosmoGrowth(**cosmo)
density_hat, L = ba.half_pixel_shift(borg_vol)
density_hat, L = ba.half_pixel_shift(borg_vol, doshift=shiftPixel)
lpt = LagrangianPerturbation(density_hat, L, fourier=True, supersample=supersample)
@ -89,16 +89,16 @@ def run_generation(input_borg, a_borg, a_ic, cosmo, supersample=1, do_lpt2=True)
print("velmul=%lg" % (cosmo['h']*velmul))
density = np.fft.irfftn(density_hat*D1_0)*(N/L)**3
density = np.fft.irfftn(lpt.dhat*D1_0)*(supersample*N/L)**3
return posx,vel,density,N,L,a_ic
return posx,vel,density,N*supersample,L,a_ic
def write_icfiles(*generated_ic, **cosmo):
"""Write the initial conditions from the tuple returned by run_generation"""
posx,vel,density,N,L,a_ic = generated_ic
ct.simpleWriteGadget("borg.gad", posx, velocities=vel, boxsize=L, Hubble=cosmo['h'], Omega_M=cosmo['omega_M_0'], time=a_ic)
for i,c in enumerate(['x','y','z']):
for i,c in enumerate(["x","y","z"]):
ct.writeGrafic("ic_velc%s" % c, vel[i].reshape((N,N,N)).transpose(), L, a_ic, **cosmo)
ct.writeGrafic("ic_deltab", density, L, a_ic, **cosmo)

6
python_sample/icgen/gen_ic_from_borg.py
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@ -8,9 +8,9 @@ cosmo['omega_k_0'] = 0
cosmo['omega_B_0']=0.049
cosmo['SIGMA8']=0.8344
zstart=200
zstart=50
astart=1/(1.+zstart)
snapid=1
halfPixelShift=True
if __name__=="__main__":
bic.write_icfiles(*bic.run_generation("initial_condition_borg.dat", 0.001, astart, cosmo, do_lpt2=False), **cosmo)
bic.write_icfiles(*bic.run_generation("initial_condition_borg.dat", 0.001, astart, cosmo, supersample=2, shiftPixel=halfPixelShift, do_lpt2=False), **cosmo)

14
python_sample/icgen/test_ic_from_borg.py
View File

@ -1,25 +1,27 @@
import numpy as np
import cosmotool as ct
import borgicgen as bic
import sys
cosmo={'omega_M_0':0.3175, 'h':0.6711}
cosmo['omega_lambda_0']=1-cosmo['omega_M_0']
cosmo['omega_k_0'] = 0
cosmo['omega_B_0']=0.049
cosmo['SIGMA8']=0.8344
N0=128
snap_id=11
snap_id=int(sys.argv[1])
s = ct.loadRamsesAll("/nethome/lavaux/remote2/borgsim/", snap_id, doublePrecision=True)
astart=s.getTime()
pos,_,density,N,L,_ = bic.run_generation("initial_condition_borg.dat", 0.001, astart, cosmo, supersample=1, do_lpt2=True)
pos,_,density,N,L,_ = bic.run_generation("initial_condition_borg.dat", 0.001, astart, cosmo, supersample=2, do_lpt2=True)
dcic = ct.cicParticles(pos, L, N)
dcic = ct.cicParticles(pos, L, N0)
dcic /= np.average(np.average(np.average(dcic, axis=0), axis=0), axis=0)
dcic -= 1
dsim = ct.cicParticles(s.getPositions(), L, N)
dsim = ct.cicParticles(s.getPositions(), L, N0)
dsim /= np.average(np.average(np.average(dsim, axis=0), axis=0), axis=0)
dsim -= 1
@ -27,8 +29,8 @@ dsim -= 1
dcic_hat = np.fft.rfftn(dcic)*(L/N)**3
dsim_hat = np.fft.rfftn(dsim)*(L/N)**3
Pcic, bcic = bic.bin_power(np.abs(dcic_hat)**2/L**3, L, bins=50)
Psim, bsim = bic.bin_power(np.abs(dsim_hat)**2/L**3, L, bins=50)
Pcic, bcic = bic.bin_power(np.abs(dcic_hat)**2/L**3, L, range=(0,1.), bins=150)
Psim, bsim = bic.bin_power(np.abs(dsim_hat)**2/L**3, L, range=(0,1.), bins=150)
borg_evolved = ct.read_borg_vol("final_density_1380.dat")