spaceMARINE

Solves 2D/3D hydrodynamic problems in Eulerian framework on a Cartesian grid with Adaptive Mesh Refinement via the BoxLib library. The name is an acronym for Space Mesh Adaptive RefINEment to signify that it is an AMR code for astrophysical use; it also happens to be the name of a fighting force from the game Warhammer 40,000.

Modifications

Users only need to modify

• init_phi.f90 This should be done by writing your own routine using the included init_template.f90 file and calling it a new name (e.g., sedov.f90) and then linking it via ln -s sedov.f90 init_phi.f90
• Adiabatic index gamma found in physics_declarations.f90; currently it is set at 5/3.
• Scaling parameters; it is up to the user to ensure the units are consistent (e.g., pscale = rscale*velscale**2)
• Change parameters in main.f90 related to maximum AMR levels, dimensionality, end time (assumes start time == 0), number of cells per dimension, high & low lengths (in code units)
  • This will be later done via a Fortran namelist file

I cannot recommend using this right now because it's not actually working. Hopefully in the near future it will work.

Source Terms

Currently the cooling function is the only source term in place (and is currently untested). Gravity will be added in the future (in x-direction, though it could be modified to be in any direction). The cooling function is stored in a defined-type Table (see source_module.f90 for its definition); it expects the file to be in the format

npoints
lower upper dT bc_lo bc_hi
value_1
value_2
...
value_npoints

where the boundary conditions specify the result at temperatures above the upper and below the lower limits. It is suggested that the lower boundary be ZERO while the upper boundary be EXTRAPOLATED.

Usage

The folder containing these source files should also be in the same directory as BoxLib, e.g.

code/
    BoxLib/
    spaceMARINE/

Then it is a matter of typing

make

to make the code. It is currently not parallelized and while there are some OpenMP commands that are present, they are not tested. Thus, running it should be

./spacemarine

Collaboration

I currently am working alone on this side project. If you are interested in working on this, please let me know via email or comment.