Hammurabi Code Files

Garfields installation instructions
-----------------------------------

Garfields was developed by F.S. Kitaura (see Kitaura&Ensslin 2007 astroph-0705.0429). 
It can generate Gaussian random fields which are divergenceless and contain helicity. 
It runs independently of hammurabi. Installation and interfacing with hammurabi are 
described here.

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Installation:
- install fftw3 (if you have not done so already) according to the instructions 
  in (http://www.fftw.org/)
- unpack the tar file (tar -xvf Garfields.tar.gz) in the wanted directory.
- edit garFields.make, and change 

LFLAGS = -L$(HOME)/lib/fftw-3.1.2/lib

and 

CFLAGS = -I$(HOME)/lib/fftw-3.1.2/include

to your respective fftw directories.

- do "make -f garFields.make"
- run the code with "garFields.x" , the parameter file is "garFields_par" .

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Interfacing with hammurabi:
The parameters which specify the size of the magnetic field box need to be identical 
in both codes (if you don't need computation speed, we recommend you keep the box cubic).

e.g.:

In Garfields:

#Field simulation box size
Nx = 64		        
Ny = 64		        
Nz = 64		        

#Output file name
out_file = magField.dat

In hammurabi:

#Input file name
B_field_random_inp=magField.dat

#Field simulation box size
B_field_nx = 64
B_field_ny = 64
B_field_nz = 64