About input parameters documentation

[pedro-ricardo]

It seems that the documentation about Run-time Inputs does not contain all parameters that can be set for AMReX. Is this documented somewhere? Like a list with the parameters and what they are for.

For example regrid_on_restart is a parameter from amr group that isn't on that documentation I linked.

Also, is there and example of how to use the initial_grid_file parameter? I imagine that this one will help me control the initial mesh topology.

[asalmgren]

Could you submit a PR to add that? And any others you’ve noticed as well?

Sent from my iPhone

On Nov 7, 2020, at 8:05 PM, Pedro Ricardo C Souza notifications@github.com wrote:



It seems that the documentation about Run-time Inputs https://amrex-codes.github.io/amrex/docs_html/Inputs_Chapter.html does not contain all parameters that can be set for AMReX. Is this documented somewhere? Like a list with the parameters and what they are for.

For example regrid_on_restart is a parameter from amr group that isn't on that documentation I linked.

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[maxpkatz]

I was thinking about this when I recently added an option without documenting it. We could, if we wanted, take this as an opportunity to implement the runtime inputs system that AMReX-Astro uses (see https://github.com/AMReX-Astro/Castro/blob/main/Source/driver/parse_castro_params.py and https://github.com/AMReX-Astro/Castro/blob/main/Source/driver/_cpp_parameters for an example). This is not a substitute for prose that describes the meaning of the various options, but at the very least it makes all of the runtime options discoverable in the same place.

[pedro-ricardo]

@asalmgren Unfortunately I don't know what parameters are missing from the documentation, so i don't have anything to add as a Pull Request.

I would liked to have a list of all parameters that can be set ... and a brief description on them.

But for now, if anyone can give me the format for the file set in parameter initial_grid_file, It's good enough ... I can't seem to find this in the examples.

[asalmgren]

The code that reads it is in Src/Amr/AMReX_Amr.cpp:

   is >> in_finest;
    STRIP;
    initial_ba.resize(in_finest);

    use_fixed_upto_level = in_finest;
    if (in_finest > max_level)
       amrex::Error("You have fewer levels in your inputs file then in

your grids file!");

    for (int lev = 1; lev <= in_finest; lev++)
    {
        BoxList bl;
        is >> ngrid;
        STRIP;
        for (int i = 0; i < ngrid; i++)
        {
            Box bx;
            is >> bx;
            STRIP;
            bx.refine(ref_ratio[lev-1]);
            bl.push_back(bx);
        }
        initial_ba[lev-1].define(bl);
    }
    is.close();
    if (verbose > 0) {
        amrex::Print() << "Read initial_ba. Size is " <<

initial_ba.size() << "\n"; }

so the first line is total number of levels > 0 (finest_level), then for each level you first put the number of grids/boxes at that level, then you write each box.

So for example, a level 0-1-2 calculation (max_level = 2) with 2 grids at level 1 and 1 grid at level 2 might look like (in 2D):

2 2 ((0,0) (15,15)(0,0)) ((16,16) (15,23)(0,0)) 1 ((8,8) (15,15)(0,0))

On Sun, Nov 8, 2020 at 11:29 AM Pedro Ricardo C Souza < notifications@github.com> wrote:

@asalmgren https://github.com/asalmgren Unfortunately I don't know what parameters are missing from the documentation, so i don't have anything to add as a Pull Request.

I would liked to have a list of all parameters that can be set ... and a brief description on them.

But for now, if anyone can give me the format for the file set in parameter initial_grid_file, It's good enough ... I can't seem to find this in the examples.

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-- Ann Almgren Senior Scientist; CCSE Group Lead