Riemann Solver Repository

This repository is a centralized location for all Clawpack-compatible Riemann solvers. If you have developed a Riemann solver that is not already here, please send it to us or issue a pull request. The format for Riemann solvers has changed significantly since Clawpack 4.3, but if you have a 4.3-style solver, send it along and we will update it.

Adding a Riemann solver

When adding a new Riemann solver, in addition to adding the normal and (optionally) transverse solver code files in src/, you should do the following in order to ensure the new solver is importable in PyClaw. To make things concrete, suppose you are committing a 2D elasticity solver, so your Fortran files are named rpn2_elasticity.f90 and rpt2_elasticity.f90. Then you should:

1. Add the following to clawpack/riemann/riemann/__init__.py:

import vc_elasticity_2D

2. Add vc_elasticity to two_d_riemann in clawpack/riemann/riemann/setup.py.
3. Add appropriate entries for num_eqn and num_waves in clawpack/riemann/riemann/static.py.

If you are adding a Python solver, then you should have a vc_elasticity_2D_py.py file in clawpack/riemann/riemann. Assuming it contains a function vc_elasticity_2D, then you should do:

1. Add the following to clawpack/riemann/riemann/__init__.py:

from vc_elasticity_2D_py import vc_elasticity_2D

2. Add appropriate entries for num_eqn and num_waves in clawpack/riemann/riemann/static.py.