A modified nonlinear Galerkin method for the viscoelastic fluid motion equations

In this article we first provide a priori estimates of the solution for the nonstationary two-dimensional viscoelastic fluid motion equations with per iodic boundary condition. We then present an modified nonlinear Galerkin me thod for solving such equations. By comparing the convergence rates of the proposed method with the standard Galerkin method, we conclude that the mod ified nonlinear Galerkin method is better than the standard Galerkin method because the former can save a large amount of computational work and maint ain the convergence rate of the latter. (C) 1999 Elsevier Science Ltd. All rights reserved.