AstroFV

AstroFV is a Finite Volume Solver for Astrophysical applications written in Python

Current Features

• Solver
  • 1-D solver
  • Time integration using Explicit Euler and Implicit Euler techniques
  • Finite Volume Method with first-order upwind discretization
  • Structured mesh
• Equations
  • (Nonlinear) Advection Equation in conservative form with space dependent velocity
• Available Astrophysical applications
  • 1-D RSTP (Relativistic Shock Tube Problem)
• General characteristics
  • Aimed at simple to use for user and easily extensible for developer
  • Object oriented, well modular design
  • no GPU support

High level view

The AstoFV is divided into two modules:

• Solver: This is further divided into two submodules:
  • One submodule defines the set of equations which are supported by the solver
  • Another submodule implements the actual numerical techniques

  Abstract interfaces are used to allow equations to use any numerical methods in a generic manner

• Astrophysical applications: This implements the respective application whose solution is needed by solving a system of equations

  Abstract interfaces are used to allow applications to easily define and use the Solver equations

Example usage

Code to solve RSTP with Explicit Euler technique

eparams = RSTPExplicitParams(1000,4/3,0.25) 
eparams.set_fig_path('./figs/')
eparams.fv_boundary_strategy = FVTransverse #Default 
eiv = RSTPIV(Vx=[0,0],Mx=[0,0],D=[1,10**-2],Rho=[1,10**-2])
ebv = RSTPBV()
test_explicit = RSTPTest(1,eparams,eiv,ebv,ode_strategy=ODEExplicit)
test_explicit.solve()

Code to solve RSTP with Implicit Euler technique

iparams = RSTPImplicitParams(1000,1.0,4/3,2,0.7)
iparams.set_fig_path('./figs/')
iparams.fv_boundary_strategy = FVTransverse #Default 
iiv = RSTPIV(Vx=[0,0],Mx=[0,0],D=[1,10**-2],Rho=[1,10**-2])
ibv = RSTPBV()
test_implicit = RSTPTest(2,iparams,iiv,ibv,ode_strategy=ODEImplicit)
test_implicit.solve()

See more at User manual and Developer manual