Parent Simulation

Initial Conditions

First we constructed a parent simulation of sufficient size to include thousands of Milky Way sized systems but also of sufficient resolution to construct good Lagrangian volumes. We decided on ~10,000 particles per Milky Way-sized host and a 100 Mpc/h volume. Our level_max=10 , which means our parent simulation’s effective resolution is (2^10)^3 = 1024^3, i.e. a parent particle mass,
mp=8.72×107Mm_p = 8.72 \times 10^7 M_\odot
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# parentics.conf
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[setup]
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boxlength = 100
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zstart = 127
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levelmin = 10
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levelmin_TF = 10
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levelmax = 10
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padding = 8
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overlap = 4
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ref_center = 0.5, 0.5, 0.5
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ref_extent = 0.2, 0.2, 0.2
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align_top = yes
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baryons = no
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use_2LPT = no
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use_LLA = no
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periodic_TF = yes
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[cosmology]
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Omega_m = 0.3175
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Omega_L = 0.6825
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Omega_b = 0.049
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H0 = 67.11
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sigma_8 = 0.8344
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nspec = 0.9624
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transfer = eisenstein
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[random]
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seed[10] = 34567
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[output]
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format = gadget2
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filename = ./ics
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gadget_num_files = 128
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[poisson]
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fft_fine = yes
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accuracy = 1e-5
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pre_smooth = 3
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post_smooth = 3
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smoother = gs
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laplace_order = 6
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grad_order = 6
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