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Support for cosmic ray fields in GAMER #4739

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merged 6 commits into from
Dec 11, 2023
Merged

Support for cosmic ray fields in GAMER #4739

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788241b
First definitions of cosmic ray fields
jzuhone Nov 13, 2023
3f96629
Fix problems with EOS detection
jzuhone Nov 15, 2023
01bc2ca
Bugfix
jzuhone Nov 15, 2023
a8f60b6
Bugfix
jzuhone Nov 21, 2023
43cb801
Simple test for cosmic rays
jzuhone Nov 21, 2023
95b434a
Catch Lorentz factor and velocity fields that end up in the file if t…
jzuhone Nov 30, 2023
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1 change: 1 addition & 0 deletions yt/frontends/gamer/data_structures.py
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Original file line number Diff line number Diff line change
Expand Up @@ -356,6 +356,7 @@ def _parse_parameter_file(self):
# make aliases to some frequently used variables
if parameters["Model"] == "Hydro":
self.gamma = parameters["Gamma"]
self.gamma_cr = self.parameters.get("CR_Gamma", None)
self.eos = parameters.get("EoS", 1) # Assume gamma-law by default
# default to 0.6 for old data format
self.mu = parameters.get(
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18 changes: 18 additions & 0 deletions yt/frontends/gamer/fields.py
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Expand Up @@ -23,6 +23,7 @@ class GAMERFieldInfo(FieldInfoContainer):
("MomY", (mom_units, ["momentum_density_y"], None)),
("MomZ", (mom_units, ["momentum_density_z"], None)),
("Engy", (erg_units, ["total_energy_density"], None)),
("CRay", (erg_units, ["cosmic_ray_energy_density"], None)),
("Pote", (pot_units, ["gravitational_potential"], None)),
# MHD fields on disk (CC=cell-centered)
("CCMagX", (b_units, [], "B_x")),
Expand Down Expand Up @@ -289,6 +290,9 @@ def et(data):
if self.ds.mhd:
# magnetic_energy is a yt internal field
Et -= data["gas", "magnetic_energy_density"]
if self.ds.gamma_cr is not None:
# cosmic rays are included in this dataset
Et -= data["gas", "cosmic_ray_energy_density"]
return Et

# thermal energy per mass (i.e., specific)
Expand Down Expand Up @@ -334,6 +338,20 @@ def _thermal_energy_density(field, data):
units=unit_system["pressure"],
)

if self.ds.gamma_cr is not None:

def _cr_pressure(field, data):
return (data.ds.gamma_cr - 1.0) * data[
"gas", "cosmic_ray_energy_density"
]

self.add_field(
("gas", "cosmic_ray_pressure"),
_cr_pressure,
sampling_type="cell",
units=self.ds.unit_system["pressure"],
)

# mean molecular weight
if hasattr(self.ds, "mu"):

Expand Down