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92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
# #Part two: the revenge of the shifts
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import numpy as np
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Lbox = 100.0
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# #This is Adrian's solution, which we want to achieve as well
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h_adrian = 0.6777
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centre_adrian = np.array(
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[56.51984186, 49.40215384, 49.64235143]
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) # NOTE: as determined from his snapshot at z=0!
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adrian_origin_in_parent_sim = (
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np.array([4.367988, 1.307087, 7.743252]) / h_adrian
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) # equal to his shift, so this should give the original parent sim coordinates:
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parent_sim_coords_of_zoom_halo_adrian = centre_adrian - adrian_origin_in_parent_sim
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print(
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f"zoom halo end coordinates in parent sim according to adrian: {parent_sim_coords_of_zoom_halo_adrian}"
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)
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# #This is, step by step, Music's way of dealing with the shift:
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# necessary for Music's calculation
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shift_unit = 2
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ncoarse = 1 << 7 # == 2 ** 7 (x << y == x * 2 ** y)
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desired_box_centre = np.array([0.5, 0.5, 0.5])
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# aka x0ref in music code:
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left_corner_highres_boundary = np.array([0.530964, 0.476099, 0.579666])
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# aka x1ref in music code:
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right_corner_highres_boundary = np.array([0.601410, 0.558650, 0.645789])
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# this seems to be the extent of the highres region in units such that it lies in [0...1[
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lxref = right_corner_highres_boundary - left_corner_highres_boundary
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# the centre of the highres region in Music:
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xc = (left_corner_highres_boundary + 0.5 * lxref) % 1.0
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# quick sanity check here
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# Adrian's shift should make the centre of the zoom region the centre of the box, so by adding his inverse shift to desired_box_centre, we might get an idea of the IC coordinates of his zoom region in the parent sim
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print(
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f"our calculated centre (at a=0.02): {xc * 100} | zoom halo IC coordinates in parent sim according to adrian: {desired_box_centre * 100 + adrian_origin_in_parent_sim}"
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)
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music_centre = np.array([58.29183329, 51.33582822, 51.69411051])
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print(f"Music centre at a=1: {music_centre} | Adrian (at a=1): {centre_adrian}")
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# back to Music
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xshift = (desired_box_centre - xc) * ncoarse / shift_unit + desired_box_centre
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xshift_without_int_conversion = xshift * shift_unit
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xshift = xshift.astype(int) * shift_unit
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print(
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f"Shift as stated by Music: {xshift} | Shift as desired by Music (without int conversion): {xshift_without_int_conversion}"
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)
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# convert xshifts
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coarse_cell_size = Lbox / ncoarse
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xshift_in_mpc = xshift * coarse_cell_size
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xshift_without_int_conversion_in_mpc = xshift_without_int_conversion * coarse_cell_size
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print(
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f"Shift as stated by Music [Mpc]: {xshift_in_mpc} | Shift as desired by Music (without int conversion) [Mpc]: {xshift_without_int_conversion_in_mpc}"
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)
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# apply shifts to centre
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parent_sim_coords_of_zoom_halo_music = xc * 100 + xshift_in_mpc
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parent_sim_coords_of_zoom_halo_music_without_int_conversion = (
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xc * 100 + xshift_without_int_conversion_in_mpc
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)
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print(
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f"zoom halo IC coordinates in zoom sim according to Music: {parent_sim_coords_of_zoom_halo_music}"
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)
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print(
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f"zoom halo IC coordinates in zoom sim according to Music without int conversion: {parent_sim_coords_of_zoom_halo_music_without_int_conversion}"
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)
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print(
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f"zoom halo end coordinates in parent sim according to Music: {music_centre + xshift_in_mpc}"
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)
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print(
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f"zoom halo end coordinates in parent sim according to Music without int conversion: {music_centre + xshift_without_int_conversion_in_mpc}"
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)
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print("--------------")
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print(xshift_in_mpc + adrian_origin_in_parent_sim)
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print(xshift_without_int_conversion_in_mpc + adrian_origin_in_parent_sim)
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print(music_centre - centre_adrian)
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print(music_centre + xshift_in_mpc - parent_sim_coords_of_zoom_halo_adrian)
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print(
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music_centre
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+ xshift_without_int_conversion_in_mpc
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- parent_sim_coords_of_zoom_halo_adrian
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)
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