History & overview

Initially, this project started as a rewrite in Fortran 90 of the CLAWPACK (Randy LeVeque) and AMRCLAW (Randy LeVeque and Marsha Berger) codes. BEARCLAW still exhibits a strong resemblance to CLAWPACK in some respects, especially in the definition of user modules. The internals are quite different though. The basic framework is to apply some action on grids organized hierarchically as a forest of trees. Highlights of the code include:

• Distributed memory parallelization
• Multigrid implementation to solve linear and nonlinear systems arising from parabolic and elliptic terms
• Multiphysics - the code can solve multiple physical laws simultaneously
• Multinumerics - different numerical schemes can be applied simultaneously
• Adaptive physics and numerics - different physical laws, numerical schemes can be activated at different resolution levels
• Data output in CLAWPACK, HDF4, HDF5, Tecplot formats

• Visualization scripts for Matlab (from CLAWPACK), OpenDX, MayaVi

The package includes a large number of examples and applications. Here are some of the PDEs solved:

• advection
• linear and nonlinear acoustics
• Burgers equation
• shallow water equations
• Euler equations
• Navier-Stokes equations (incompressible, stratified, compressible)
• Stokes equations
• elasticity
• viscoelasticity
• MHD

Using BEARCLAW

What you should already know

• Prerequisites: Fortran 95/2003, Un*x (try openSUSE and Xubuntu)

• Good to know: Python, Wiki culture (MoinMoin)

• If you want to see results: OpenDX, Matlab, Mayavi, HDF

• If you want to solve big problems: MPI

Documentation

Showcase

Examples

A large number of examples are available. Browse the svn repository at http://coanda.amath.unc.edu/trac_projects/bearclaw/browser/examples