Accession Number:

ADA214102

Title:

Numerical Methods for Parabolic Equations and Inequalities in Very High Dimensions

Descriptive Note:

Final rept. May 1986-May 1989

Corporate Author:

HOUSTON UNIV TX DEPT OF MATHEMATICS

Personal Author(s):

Report Date:

1989-10-05

Pagination or Media Count:

21.0

Abstract:

The main goal of this projects was to investigate the numerical solution of parabolic equations in very high dimension, the principal motivation being the solution of the so-called Zakai equation from nonlinear filtering. As it will be seen in Section 2, below, this equation is of the advection-diffusion type and therefore is closely related to other equations of this type such as the Navier-Stokes equations from Fluid Dynamics since these equations are also of interest for the Department of Defense some aspects o their numerical solution, byproducts of the present investigation will be considered in the present document. The content of this report is the following In section 2, we describe the Zakai and its origin. In Section 3, we consider the solution of time dependent problems by operator splitting methods, and show in Sections 4, 5, 6, how these methods apply to the Zakai equation, to parabolic inequalities of obstacle type and to Navier-Stokes equations. In Section 7 we comment on the solution of advection-diffusion problems by up winding, particle and characteristics methods. In Section 8 we go back to the Zakai equation and its stochastic dynamical system origin and comment about the feasibility of the Zakai equation approach for the analysis of such systems.

Subject Categories:

  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE