Least-squares finite-element lattice Boltzmann method

Authors

Yusong Li, University of Nebraska - LincolnFollow
Eugene J. LeBoeuf, Vanderbilt University, Nashville, Tennessee
P. K. Basu, Vanderbilt University, Nashville, Tennessee

Document Type

Article

Date of this Version

6-2004

Comments

Published in PHYSICAL REVIEW E 69, 065701(R) (2004). Copyright ©2004 The American Physical Society. Used by permission.

Abstract

A new numerical model of the lattice Boltzmann method utilizing least-squares finite element in space and Crank-Nicolson method in time is presented. The new method is able to solve problem domains that contain complex or irregular geometric boundaries by using finite-element method’s geometric flexibility and numerical stability, while employing efficient and accurate least-squares optimization. For the pure advection equation on a uniform mesh, the proposed method provides for fourth-order accuracy in space and second-order accuracy in time, with unconditional stability in the time domain. Accurate numerical results are presented through two-dimensional incompressible Poiseuille flow and Couette flow.