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etude - Hierarchical N-body/SPH code
etude [parameter=value]
etude is an SPH code whereby the gas is (in 2D or 3D) non-selfgravitating
in an analytic static background potential. Particles are stored in a tree
structure (see treecode1(1NEMO)
in order to efficiently find the nearest
neighbors required by the SPH algorithm.
The following parameters
are recognized in any order if the keyword is also given:
- in=
- Input file
with initial conditions []
- out=
- Output file of N-body frames []
- param=
- Parameter file of calculation []
- freq=
- Fundamental integration frequency
[32.0]
- eps=
- Density smoothing length [0.025]
- selfgrav=
- Compute self-gravity
[false]
- theta=
- Force accuracy parameter [1.0]
- usequad=
- If true,
use quad moments [false]
- options=
- Various control options []
- tstop=
- Time to stop integration [3.0]
- freqout=
- Data output frequency [30.0]
- nbody=
- Number of bodies for test run [5000]
- seed=
- Random number seed
for test run [123]
- save=
- Write state file as code runs []
- restore=
- Continue
run from state file []
- mode=
- Mode of spiral pattern [2.0]
- pitch=
- Pitch
angle of spirals [deg] [10.0]
- rinit=
- Radius of initial disk [kpc] [3.0]
- rcore=
- Core radius [kpc] [1.0]
- vmax=
- Maximum disk rotation [km/s]
[220.0]
- omgb=
- Bar pattern speed [km/s/kpc] [26.1]
- fgas=
- Mass fraction
of gas in unit radius [0.05]
- fbar=
- Strength of bar potential [0.1]
- rcorebh=
- Core radius of central black hole [kpc] [0.01]
- fbh=
- Mass ratio of central
BH to the galaxy
- alpha=
- Coefficient of viscosity [1.0]
- beta=
- Coefficient
of viscosity [2.0]
- nnbr=
- Requested number of neighbors [32]
- nmax=
- Maximum number of neighbors [42]
- nmin=
- Minimum number of neighbors [22]
Jin Koda
23-Oct-07 V1.8 man page created for NEMO version PJT
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