https://github.com/zerothi/multigrid

Simple multigrid method
https://github.com/zerothi/multigrid

Last synced: 4 months ago
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Simple multigrid method

• Host: GitHub
• URL: https://github.com/zerothi/multigrid
• Owner: zerothi
• Created: 2015-03-24T13:26:36.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2016-11-07T14:39:56.000Z (over 9 years ago)
• Last Synced: 2025-04-14T17:16:50.973Z (about 1 year ago)
• Language: FORTRAN
• Size: 107 KB
• Stars: 3
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
## Multigrid method for Poisson equation

This simple code solves the Poisson equation for open boundary problems

often encountered in DFT+NEGF calculations.

In particular can it solve problems with periodic, Dirichlet and Neumann

boundary conditions individually selected on each boundary.

### Method

We employ an adaptive/customizable multi grid method where every level

can be controlled arbitrarily by the user.

### Usage

Compile the MG library using

    make

to compile the executable for solving input files, do

	make mg

which creates the executable `src/mg` which can read input files.

In the `test` folder several examples exists of input files for

complex MG setups.

#### Precision

The precision can be controlled to arbitrary value. However, it is not

stringently following conventional multi-grid methods as we simply want

a reasonable guess for the Poisson solution.