Preprint 1996-003

Conservation Laws with a Random Source

Abstract: We study the scalar conservation law with a noisy non-linear source, viz., $u_t + f(u)_x = h(u,x,t) + g(u)W(t)$, where $W(t)$ is white noise in the time variable, and we analyse the Cauchy problem for this equation where the initial data are assumed to be deterministic. A method is proposed to construct approximate weak solutions, and we then show that this yields a convergent sequence. This sequence converges to a (pathwise) solution of the Cauchy problem. The equation can be considered as a model of deterministic driven phase transitions with a random perturbation in a system of two constituents. Finally we show some numerical results motivated by two-phase flow in porous media.

Paper:

Available as PostScript

Title:

Conservation Laws with a Random Source

Author(s):

Helge Holden, mailto:holden@math.ntnu.no

Nils Henrik Risebro, mailto:nilshr@math.uio.no

Publishing information:

To appear in Appl. Math. Optim.

Submitted by:

mailto:holden@math.ntnu.no June 12 1996.