Source code for yt.frontends.flash.fields

from yt.fields.field_info_container import FieldInfoContainer

# Common fields in FLASH: (Thanks to John ZuHone for this list)
#
# dens gas mass density (g/cc) --
# eint internal energy (ergs/g) --
# ener total energy (ergs/g), with 0.5*v^2 --
# gamc gamma defined as ratio of specific heats, no units
# game gamma defined as in , no units
# gpol gravitational potential from the last timestep (ergs/g)
# gpot gravitational potential from the current timestep (ergs/g)
# grac gravitational acceleration from the current timestep (cm s^-2)
# pden particle mass density (usually dark matter) (g/cc)
# pres pressure (erg/cc)
# temp temperature (K) --
# velx velocity x (cm/s) --
# vely velocity y (cm/s) --
# velz velocity z (cm/s) --

b_units = "code_magnetic"
pres_units = "code_mass/(code_length*code_time**2)"
en_units = "code_mass * (code_length/code_time)**2"
rho_units = "code_mass / code_length**3"


[docs]class FLASHFieldInfo(FieldInfoContainer): known_other_fields = ( ("velx", ("code_length/code_time", ["velocity_x"], None)), ("vely", ("code_length/code_time", ["velocity_y"], None)), ("velz", ("code_length/code_time", ["velocity_z"], None)), ("dens", ("code_mass/code_length**3", ["density"], None)), ("temp", ("code_temperature", ["temperature"], None)), ("pres", (pres_units, ["pressure"], None)), ("gpot", ("code_length**2/code_time**2", ["gravitational_potential"], None)), ("gpol", ("code_length**2/code_time**2", [], None)), ("tion", ("code_temperature", [], None)), ("tele", ("code_temperature", [], None)), ("trad", ("code_temperature", [], None)), ("pion", (pres_units, [], None)), ("pele", (pres_units, [], "Electron Pressure, P_e")), ("prad", (pres_units, [], "Radiation Pressure")), ("eion", (en_units, [], "Ion Internal Specific Energy")), ("eele", (en_units, [], "Electron Internal Specific Energy")), ("erad", (en_units, [], "Radiation Internal Specific Energy")), ("pden", (rho_units, [], "Particle Mass Density")), ("depo", ("code_length**2/code_time**2", [], None)), ("ye", ("", [], "Y_e")), ("magp", (pres_units, [], None)), ("divb", ("code_magnetic/code_length", [], None)), ("game", ("", [], r"\gamma_e\ \rm{(ratio\ of\ specific\ heats)}")), ("gamc", ("", [], r"\gamma_c\ \rm{(ratio\ of\ specific\ heats)}")), ("flam", ("", [], None)), ("absr", ("", [], "Absorption Coefficient")), ("emis", ("", [], "Emissivity")), ("cond", ("", [], "Conductivity")), ("dfcf", ("", [], "Diffusion Equation Scalar")), ("fllm", ("", [], "Flux Limit")), ("pipe", ("", [], "P_i/P_e")), ("tite", ("", [], "T_i/T_e")), ("dbgs", ("", [], "Debug for Shocks")), ("cham", ("", [], "Chamber Material Fraction")), ("targ", ("", [], "Target Material Fraction")), ("sumy", ("", [], None)), ("mgdc", ("", [], "Emission Minus Absorption Diffusion Terms")), ("magx", (b_units, [], "B_x")), ("magy", (b_units, [], "B_y")), ("magz", (b_units, [], "B_z")), ) known_particle_fields = ( ("particle_posx", ("code_length", ["particle_position_x"], None)), ("particle_posy", ("code_length", ["particle_position_y"], None)), ("particle_posz", ("code_length", ["particle_position_z"], None)), ("particle_velx", ("code_length/code_time", ["particle_velocity_x"], None)), ("particle_vely", ("code_length/code_time", ["particle_velocity_y"], None)), ("particle_velz", ("code_length/code_time", ["particle_velocity_z"], None)), ("particle_tag", ("", ["particle_index"], None)), ("particle_mass", ("code_mass", ["particle_mass"], None)), ( "particle_gpot", ("code_length**2/code_time**2", ["particle_gravitational_potential"], None), ), )
[docs] def setup_fluid_fields(self): from yt.fields.magnetic_field import setup_magnetic_field_aliases unit_system = self.ds.unit_system # Adopt FLASH 4.6 value for Na Na = self.ds.quan(6.022140857e23, "g**-1") for i in range(1, 1000): self.add_output_field( ("flash", f"r{i:03}"), sampling_type="cell", units="", display_name=f"Energy Group {i}", ) # Add energy fields def ekin(data): ek = data["flash", "velx"] ** 2 if data.ds.dimensionality >= 2: ek += data["flash", "vely"] ** 2 if data.ds.dimensionality == 3: ek += data["flash", "velz"] ** 2 return 0.5 * ek if ("flash", "ener") in self.field_list: self.add_output_field( ("flash", "ener"), sampling_type="cell", units="code_length**2/code_time**2", ) self.alias( ("gas", "specific_total_energy"), ("flash", "ener"), units=unit_system["specific_energy"], ) else: def _ener(field, data): ener = data["flash", "eint"] + ekin(data) try: ener += data["flash", "magp"] / data["flash", "dens"] except Exception: pass return ener self.add_field( ("gas", "specific_total_energy"), sampling_type="cell", function=_ener, units=unit_system["specific_energy"], ) if ("flash", "eint") in self.field_list: self.add_output_field( ("flash", "eint"), sampling_type="cell", units="code_length**2/code_time**2", ) self.alias( ("gas", "specific_thermal_energy"), ("flash", "eint"), units=unit_system["specific_energy"], ) else: def _eint(field, data): eint = data["flash", "ener"] - ekin(data) try: eint -= data["flash", "magp"] / data["flash", "dens"] except Exception: pass return eint self.add_field( ("gas", "specific_thermal_energy"), sampling_type="cell", function=_eint, units=unit_system["specific_energy"], ) ## Derived FLASH Fields if ("flash", "abar") in self.field_list: self.alias(("gas", "mean_molecular_weight"), ("flash", "abar")) elif ("flash", "sumy") in self.field_list: def _abar(field, data): return 1.0 / data["flash", "sumy"] self.add_field( ("gas", "mean_molecular_weight"), sampling_type="cell", function=_abar, units="", ) elif "eos_singlespeciesa" in self.ds.parameters: def _abar(field, data): return data.ds.parameters["eos_singlespeciesa"] * data["index", "ones"] self.add_field( ("gas", "mean_molecular_weight"), sampling_type="cell", function=_abar, units="", ) if ("flash", "sumy") in self.field_list: def _nele(field, data): return data["flash", "dens"] * data["flash", "ye"] * Na self.add_field( ("gas", "El_number_density"), sampling_type="cell", function=_nele, units=unit_system["number_density"], ) def _nion(field, data): return data["flash", "dens"] * data["flash", "sumy"] * Na self.add_field( ("gas", "ion_number_density"), sampling_type="cell", function=_nion, units=unit_system["number_density"], ) def _number_density(field, data): return ( data["gas", "El_number_density"] + data["gas", "ion_number_density"] ) else: def _number_density(field, data): return data["flash", "dens"] * Na / data["gas", "mean_molecular_weight"] self.add_field( ("gas", "number_density"), sampling_type="cell", function=_number_density, units=unit_system["number_density"], ) setup_magnetic_field_aliases(self, "flash", [f"mag{ax}" for ax in "xyz"])