Skip to content
master
Go to file
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
 
 
 
 
 
 
src
 
 
 
 
 
 
 
 
 
 
 
 

README.md

Octree-mg

The octree-mg library implements parallel geometric multigrid methods on quadtree/octree grids, which can be used to solve elliptic PDEs such as Poissons's equation. The provided solvers can be used in existing adaptive-mesh-refinement (AMR) frameworks that employ quadtree/octree grids.

Usage

Type make in the top folder, and run the programs in the tests folder.

Including the library in other projects

You can either include a full copy of octree-mg using e.g. git submodules of subtrees, or include it as a single Fortran module, see the folder single_module.

Features

  • MPI parallelization
  • The same code can be used in 2D/3D (compiled into two different libraries)
  • Support for adaptively refined grids, with a consistent discretization near refinement boundaries
  • Rectangular grids can easily be created (e.g. 512 x 256 x 256 cells).
  • Operators with sparse stencils (5/7-point in 2D/3D) are supported
  • Support for periodic, Dirichlet, Neumann, and continuous boundary conditions
  • Coarse grids are automatically created

Restrictions

  • One layer of ghost cells is used, and diagonal ghost cells are currently not set. This means stencils with diagonal elements are not possible.
  • Point-wise smoothers are employed, so currently a requirement is that dx, dy and dz are similar

Using the free-space solver in MPI-AMRVAC

The "single-module" version of this library is included in MPI-AMRVAC, but it does not include the free-space module. An example of how to do this can be found under tests/multigrid/free_space_3d in the MPI-AMRVAC folder, see in particular the file local.make.

About

MPI geometric multigrid solver for quadtree/octree grids

Resources

Releases

No releases published

Packages

No packages published
You can’t perform that action at this time.