burgers_time_inviscid

burgers_time_inviscid, an Octave code which solves the time-dependent inviscid Burgers equation with one of six solution methods selected by the user, by Mikal Landajuela.

The function u(x,t) is to be solved for in the equation:

du/dt + u * du/dx = 0

u(x,tmin) = uinit(x);

u(a,t) = alpha, u(b,t) = beta

Problem data includes the spatial endpoints a and b, the Dirichlet boundary values u(a,t) = alpha, u(b,t) = beta, and the final time t_max.

The conservative form of the equation is

du/dt + 1/2 * d(u^2)/dx = 0

There are six solution methods provided in this package:

1. Upwind nonconservative;
2. Upwind conservative;
3. Lax Friedrichs;
4. Lax Wendroff;
5. MacCormack;
6. Godunov.

The problem specification requires an initial condition, to be determined by a function. Five such functions are provided, and the user is free to write a new one:

1. ic_expansion.m, an expansion wave;
2. ic_gaussian.m, a gaussian;
3. ic_shock.m, a shock wave;
4. ic_spike.m, a spike;
5. ic_spline.m, a spline through data points.

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Languages:

burgers_time_inviscid is available in a MATLAB version and an Octave version.

Related Data and Programs:

burgers_time_inviscid_test

burgers, a dataset directory which contains some solutions to the viscous Burgers equation.

burgers_solution, an Octave code which evaluates an exact solution of the time-dependent 1D viscous Burgers equation.

burgers_steady_viscous, an Octave code which solves the steady (time-independent) viscous Burgers equation using a finite difference discretization of the conservative form of the equation, and then applying Newton's method to solve the resulting nonlinear system.

burgers_time_viscous, an Octave code which solves the time-dependent viscous Burgers equation using a finite difference discretization of the conservative form of the equation.

fd1d_burgers_lax, an Octave code which applies the finite difference method and the Lax-Wendroff method to solve the non-viscous Burgers equation in one spatial dimension and time.

fd1d_burgers_leap, an Octave code which applies the finite difference method and the leapfrog approach to solve the non-viscous time-dependent Burgers equation in one spatial dimension.

Reference:

1. Daniel Zwillinger,
   Handbook of Differential Equations,
   Academic Press, 1997,
   ISBN: 0127843965,
   LC: QA371.Z88.

Source Code:

• burgers_time_inviscid.m, integrates a discretized form of the time dependent inviscid Burgers equation.
• ic_expansion.m, an initial condition function for an expansion wave.
• ic_gaussian.m, an initial condition function for a Gaussian.
• ic_shock.m, an initial condition function for a shock wave.
• ic_spike.m, an initial condition function for a spike.
• ic_spline.m, an initial condition function for a spline through data.