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params.txt
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params.txt
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%-------------------------------------------------------------------------
%---- This file contains the input parameters needed at run-time for
% simulations. It is based on and closely resembles the GADGET-3
% parameterfile (format of which and parsing routines written by
% Volker Springel [[email protected]]). It has been updated
% with new naming conventions and additional variables as needed by
% Phil Hopkins [[email protected]] for GIZMO.
%-------------------------------------------------------------------------
%---- Relevant files (filenames and directories)
InitCondFile NAME
OutputDir OUTFOLDER
%---- File formats (input and output)
ICFormat 3 % 1=unformatted (gadget) binary, 3=hdf5, 4=cluster
SnapFormat 3 % 1=unformatted (gadget) binary, 3=hdf5
%---- Output parameters
RestartFile restart
SnapshotFileBase snapshot
OutputListOn 0 % =1 to use list in "OutputListFilename"
OutputListFilename output_times.txt % list of times (in code units) for snaps
NumFilesPerSnapshot 1
NumFilesWrittenInParallel 1 % must be < N_processors & power of 2
%---- Output frequency
TimeOfFirstSnapshot 0. % time (code units) of first snapshot
TimeBetSnapshot DTSNAP % time between (if OutputListOn=0), code units
TimeBetStatistics DTSNAP % time between additional statistics (e.g. energy)
%---- CPU run-time and checkpointing time-limits
TimeLimitCPU 172800 % in seconds
CpuTimeBetRestartFile 7200 % in seconds
ResubmitOn 0
ResubmitCommand my-scriptfile
%---- Desired simulation beginning and end times (in code units) for run
TimeBegin 0.0 % Beginning of the simulation
TimeMax TMAX % End of the simulation
%---- Maximum and minimum timesteps allowed
MaxSizeTimestep MAXTIMESTEP % in code units, set for your problem
MinSizeTimestep 1.0e-15 % set this very low, or get the wrong answer
%---- System of units
UnitLength_in_cm UNIT_L % should be 1 pc
UnitMass_in_g UNIT_M % should be 1 solar mass
UnitVelocity_in_cm_per_s UNIT_V % should be 1 m/sec
UnitMagneticField_in_gauss UNIT_B % should be 1 Tesla
GravityConstantInternal 0 % calculated by code if =0
%---- Cosmological parameters
ComovingIntegrationOn 0 % is it cosmological? (yes=1, no=0)
BoxSize BOXSIZE % in code units
Omega0 0. % =0 for non-cosmological
OmegaLambda 0. % =0 for non-cosmological
OmegaBaryon 0. % =0 for non-cosmological
HubbleParam 1. % little 'h'; =1 for non-cosmological runs
%----- Memory allocation
%MaxMemSize 5000 % sets maximum MPI process memory use in MByte
PartAllocFactor 5.0 % memory load allowed for better cpu balance
BufferSize 500 % in MByte
%---- Rebuild domains when >this fraction of particles active
TreeDomainUpdateFrequency 0.005 % 0.0005-0.05, dept on core+particle number
%---- (Optional) Initial hydro temperature & temperature floor (in Kelvin)
InitGasTemp 20 % set by IC file if =0
MinGasTemp 2.73 % don't trust cooling function below ~5K, whether dust, molecular lines, or photoelectric heating
%---- Hydro reconstruction (kernel) parameters
DesNumNgb 32 % domain-reconstruction kernel number: 32 standard, 60-114 for quintic
MaxHsml 1.0e10 % minimum gas kernel length (some very large value to prevent errors)
MinGasHsmlFractional 0 % minimum kernel length relative to gas force softening (<= 1)
%---- Gravitational softening lengths
%----- Softening lengths per particle type. If ADAPTIVE_GRAVSOFT is set, these
%-------- are the minimum softening allowed for each type -------
%-------- (units are co-moving for cosmological integrations)
SofteningGas 1e-10 % gas (particle type=0) (in co-moving code units)
SofteningHalo 0.020 % dark matter/collisionless particles (type=1)
SofteningDisk 0.150 % collisionless particles (type=2)
SofteningBulge 0.500 % collisionless particles (type=3)
SofteningStars SOFTENING % stars spawned from gas (type=4)
SofteningBndry SOFTENING % black holes (if active), or collisionless (type=5)
%---- if these are set in cosmo runs, SofteningX switches from comoving to physical
%------- units when the comoving value exceeds the choice here
%------- (these are ignored, and *only* the above are used, for non-cosmo runs)
SofteningGasMaxPhys 0.0005 % e.g. switch to 0.5pc physical below z=1
SofteningHaloMaxPhys 0.010
SofteningDiskMaxPhys 0.075
SofteningBulgeMaxPhys 0.250
SofteningStarsMaxPhys 0.0005
SofteningBndryMaxPhys 0.0005
%----- parameters for adaptive gravitational softening
AGS_DesNumNgb 32 % neighbor number for calculating adaptive gravsoft
%-------------------------------------------------------------------------
%-------------------------------------------------------------------------
%---------- Physics Modules ----------------------------------------------
%-------------------------------------------------------------------------
%-------------------------------------------------------------------------
%------------------------------------------------------------
%------------------ Additional Fluid Physics ----------------
%------------------------------------------------------------
%---- Magneto-Hydrodynamics Parameters (MAGNETIC on)
%----- Initial B-Field Strengths (if MHD_B_SET_IN_PARAMS on, otherwise read from IC file)
BiniX 1.0e-8 % initial B_x, in code units
BiniY 1.0e-8 % initial B_y, in code units
BiniZ 1.0e-8 % initial B_z, in code units
%---- Thermal Conduction (CONDUCTION on)
%----- set coefficient kappa [code units] or, if CONDUCTION_SPITZER on, multiplies value
ConductionCoeff 1.0 % set/multiply conduction coefficient
%---- Navier-Stokes Viscosity (VISCOSITY on)
%--- set coefficients eta,zeta [code units] or, if VISCOSITY_BRAGINSKII on, multiplies value
ShearViscosityCoeff 1.0 % set/multiply shear viscosity coefficient
BulkViscosityCoeff 1.0 % set/multiply bulk viscosity coefficient
%---- Turbulent Diffusion Master Switch (TURB_DIFFUSION on)
TurbDiffusionCoefficient 1.0 % Normalizes diffusion rates relative to Smagorinsky-Lilly theory [best calibration] (~0.5-2)
%---- Cosmic Ray + Gas Fluids (COSMIC_RAYS on)
CosmicRayDiffusionCoeff 1.0 % multiplies anisotropic diffusion/streaming coefficients
%---- Dust-Gas Mixtures (GRAIN_FLUID on)
Grain_Internal_Density 1.0 % internal/material density of grains in g/cm^3
Grain_Size_Min 1.e-6 % minimum grain size in cm
Grain_Size_Max 1.e-4 % maximum grain size in cm
Grain_Size_Spectrum_Powerlaw 0.5 % power-law distribution of grain sizes (dm/dlnr~r^x)
%-------------------------------------------------------------------------
%------------------ Star, Black Hole, and Galaxy Formation ---------------
%-------------------------------------------------------------------------
%---- Star Formation parameters (GALSF on)
CritPhysDensity RHOMAX % critical physical density for star formation (cm^(-3))
SfEffPerFreeFall 1.0 % SFR/(Mgas/tfreefall) for gas which meets SF criteria
%---- sub-grid (Springel+Hernquist/GADGET/AREPO) "effective equation of state"
%------- star formation+feedback model (GALSF_EFFECTIVE_EQS on)
MaxSfrTimescale 4.0 % code units (SF timescale at 2-phase threshold)
TempSupernova 3.0e8 % in Kelvin (temp of hot gas in 2-phase model)
TempClouds 1000.0 % in Kelvin (temp of cold gas in 2-phase model)
FactorSN 0.1 % SNe coupling frac (frac of egy retained in hot)
FactorEVP 3000.0 % controls Kennicutt normalization
FactorForSofterEQS 1.0 % interpolate between 'stiff' and isothermal EOS
%------- the sub-grid "decoupled winds" model (GALSF_SUBGRID_WINDS on)
WindEfficiency 2.0 % mass-loading (Mdot_wind = SFR * WindEfficiency)
WindEnergyFraction 0.06 % fraction of SNe energy in winds (sets velocity)
WindFreeTravelMaxTime 0.1 % 'free-stream time' in units of t_Hubble(z)
WindFreeTravelDensFac 0.1 % 'free-stream' until density < this * CritPhysDensity
%------- alternative winds (set GALSF_SUBGRID_WIND_SCALING == 1 or 2)
%------- (scaling with local dark matter properties, as Dave/Oppenheimer/Mannucci/Illustris)
VariableWindVelFactor 1.0 % wind velocity relative to estimated halo v_escape
VariableWindSpecMomentum 5000. % wind momentum per unit stellar mass (code velocity units)
%-------------- FIRE (PFH) explicit star formation & feedback model (FIRE on)
%--- initial metallicity of gas & stars in simulation
InitMetallicity ZINIT % initial gas+stellar metallicity (in solar)
InitStellarAge 0.0 % initial mean age (in Gyr; for stars in sim ICs)
%--- local radiation-pressure driven winds (GALSF_FB_FIRE_RT_LOCALRP)
WindMomentumLoading 1.0 % fraction of photon momentum to couple
%--- SneII Heating Model (GALSF_FB_MECHANICAL)
SNeIIEnergyFrac 1.0 % fraction of mechanical energy to couple
%--- HII region photo-heating model (GALSF_FB_FIRE_RT_HIIHEATING)
HIIRegion_fLum_Coupled 1.0 % fraction of ionizing photons allowed to see gas
%--- long-range radiation pressure acceleration (GALSF_FB_FIRE_RT_LONGRANGE)
PhotonMomentum_Coupled_Fraction 1.0 % fraction of L to allow incident
PhotonMomentum_fUV 0.0 % incident SED f(L) in UV (minimum scattering)
PhotonMomentum_fOPT 0.0 % incident SED f(L) in optical/near-IR
%--- gas return/recycling
GasReturnFraction 1.0 % fraction of gas mass returned (relative to ssp)
GasReturnEnergy 1.0 % fraction of returned gas energy+momentum (relative to ssp)
%--- cosmic rays (COSMIC_RAYS)
CosmicRay_SNeFraction 0.1 % fraction of SNe ejecta kinetic energy into cosmic rays (~10%)
InterstellarRadiationFieldStrength ISRF % interstellar radiation field intensity relative to values measured in Solar neighborhood
%-------------- Black Hole accretion & formation (BLACK_HOLES on)
%--- formation/seeding
SeedBlackHoleMass BH_SEED_MASS % initial mass (on-the-fly or single galaxy)
SeedAlphaDiskMass 0.0 % initial mass in the alpha disk (BH_ALPHADISK_ACCRETION)
SeedBlackHoleMinRedshift 2.0 % minimum redshift where new BH particles are seeded (lower-z ceases seeding)
SeedBlackHoleMassSigma 0.5 % lognormal standard deviation (in dex) in initial BH seed masses
%----- (specific options for on-the-fly friends-of-friends based BH seeding: FOF on)
MinFoFMassForNewSeed 10. % minimum mass of FOF group (stars or DM) to get seed, in code units
TimeBetOnTheFlyFoF 1.01 % time (in code units, e.g. scale-factor) between on-the-fly FOF searches
%--- accretion
BlackHoleAccretionFactor 1.0 % multiplier for mdot (relative to model)
BlackHoleEddingtonFactor 1e100 % fraction of eddington to cap (can be >1)
BlackHoleNgbFactor 1.0 % multiplier for kernel neighbors for BH
BlackHoleMaxAccretionRadius BOXSIZE % max radius for BH neighbor search/accretion (code units)
BlackHoleRadiativeEfficiency 5e-7 % radiative efficiency (for accretion and feedback)
%--- feedback
BlackHoleFeedbackFactor 1.0 % generic feedback strength multiplier
BH_FluxMomentumFactor 0.0 % multiply radiation pressure (BH_PHOTONMOMENTUM), set it to zero to avoid launching gas from rad. pressure
BAL_f_accretion 0.7 % fraction of gas swallowed by BH (BH_WIND options)
BAL_v_outflow 100. % velocity (km/s) of BAL outflow (BH_WIND options)
BAL_internal_temperature 1.0e3 % internal temperature (K) of BAL outflow (BH_WIND_SPAWN)
BAL_wind_particle_mass JET_PART_MASS % mass of 'virtual wind particles' in code units (BH_WIND_SPAWN)
BAL_wind_particle_mass_MS MS_WIND_PART_MASS % mass of 'virtual wind particles' in MS stellar winds, if 0 then BAL_wind_particle_mass is used, in code units (SINGLE_STAR_FB_WINDS)
%-------------------------------------------------------------------------
%------------------ Grackle cooling module -----------------
%-------------------------------------------------------------------------
%-------------- Grackle UVB file (COOL_GRACKLE on)
GrackleDataFile CloudyData_UVB=HM2012.h5
%-------------------------------------------------------------------------
%------------------ Driven Turbulence (Large-Eddy boxes) -----------------
%-------------------------------------------------------------------------
%-------------- Legacy Turbulent stirring parameters (TURB_DRIVING on)
%ST_decay TURBDECAY % decay time for driving-mode phase correlations
%ST_energy TURBENERGY % energy of driving-scale modes: sets norm of turb
%ST_DtFreq TURBFREQ % time interval for driving updates (set by hand)
%ST_Kmin TURB_KMIN % minimum driving-k: should be >=2.*M_PI/All.BoxSize
%ST_Kmax TURB_KMAX % maximum driving-k: set to couple times Kmin or more if cascade desired
%ST_SolWeight 1.0 % fractional wt of solenoidal modes (wt*curl + (1-wt)*div)
%ST_AmplFac 1.0 % multiplies turb amplitudes
%ST_SpectForm 3 % driving pwr-spec: 0=Ek~const; 1=sharp-peak at kc; 2=Ek~k^(-5/3); 3=Ek~k^-2
%ST_Seed 42 % random number seed for modes (so you can reproduce it)
%IsoSoundSpeed 200. % initializes gas sound speed in box to this value
%TimeBetTurbSpectrum DTSNAP % time (code units) between evaluations of turb pwrspec
%-------------- Turbulent stirring parameters (TURB_DRIVING on)
TurbDrive_ApproxRMSVturb TURB_SIGMA
TurbDrive_MinWavelength TURB_MINLAMBDA
TurbDrive_MaxWavelength TURB_MAXLAMBDA
TurbDrive_SolenoidalFraction 1
TurbDrive_CoherenceTime TURB_COHERENCE_TIME
TurbDrive_DrivingSpectrum 1
TurbDrive_RandomNumberSeed 42
TurbDrive_TimeBetweenTurbUpdates DTSNAP
TurbDrive_TimeBetTurbSpectrum DTSNAP
%-------------------------------------------------------------------------------------------------
%------------------ Non-Standard Dark Matter, Dark Energy, Gravity, or Expansion -----------------
%-------------------------------------------------------------------------------------------------
%-------------- Parameters for non-standard or time-dependent Gravity/Dark Energy/Expansion (GR_TABULATED_COSMOLOGY on)
DarkEnergyConstantW -1 % time-independent DE parameter w, used only if no table
TabulatedCosmologyFile CosmoTbl % table with cosmological parameters
%-------------------------------------------------------------
%------------------ Solid bodies and Impacts -----------------
%-------------------------------------------------------------
%-------------- Parameters for custom Tillotson equation-of-state (EOS_TILLOTSON on)
%--- In ICs, set "CompositionType": 0=custom,1=granite,2=basalt,3=iron,4=ice,5=olivine/dunite,6=water;
%--- their EOS parameters will be set accordingly. If CompositionType=0, the custom parameters below
%--- are used, matched to the definitions in Table A1 of Reinhardt+Stadel 2017,MNRAS,467,4252 (below is iron)
Tillotson_EOS_params_a 0.5 % a parameter [dimensionless]
Tillotson_EOS_params_b 1.5 % b parameter [dimensionless]
Tillotson_EOS_params_u_0 9.5e10 % u_0 parameter in [erg/g]
Tillotson_EOS_params_rho_0 7.86 % rho_0 parameter in [g/cm^3]
Tillotson_EOS_params_A 1.28e12 % A parameter in [erg/cm^3]
Tillotson_EOS_params_B 1.05e12 % B parameter in [erg/cm^3]
Tillotson_EOS_params_u_s 1.42e10 % u_s parameter in [erg/g]
Tillotson_EOS_params_u_s_prime 8.45e10 % u_s^prime parameter in [erg/g]
Tillotson_EOS_params_alpha 5.0 % alpha parameter [dimensionless]
Tillotson_EOS_params_beta 5.0 % beta parameter [dimensionless]
Tillotson_EOS_params_mu 7.75e11 % elastic shear modulus in [erg/cm^3] (used if EOS_ELASTIC is on)
Tillotson_EOS_params_Y0 8.5e10 % hugoniot elastic limit in [erg/cm^3] (used if EOS_ELASTIC is on)
%--- Developer-Mode Parameters (usually hard-coded, but set manually if DEVELOPER_MODE is on) --------
ErrTolTheta 0.5 % 0.7=standard
ErrTolForceAcc 0.0025 % 0.0025=standard
ErrTolIntAccuracy 0.01 % <0.02
CourantFac 0.2 % <0.20
MaxRMSDisplacementFac 0.125 % <0.25
MaxNumNgbDeviation 0.05 % <<DesNumNgb (values<1 are fine)
AGS_MaxNumNgbDeviation 0.10 % tolerance in Nngb (make larger than gas)
%---- Magneto-Hydrodynamics Developer-Mode Parameters (MAGNETIC on)
%--- Dedner 2002 div-cleaning parameters
DivBcleaningParabolicSigma 1.0 % (3D~0.7-1.0,2D~0.2-0.3)
DivBcleaningHyperbolicSigma 1.0 % (~1)