Author(s)

M.S. Ingber, A.K. Mitra & R.R. Chakravarty

Abstract

Invited Paper A two-step grid optimization method for the direct boundary element method M.S. Ingber", A.K. Mitra*, R.R. Chakravarty' "Department of Mechanical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA Department of Aerospace Engineering and Engineering Mechanics, Iowa State University, Ames, Iowa 50011, USA * Computer Sciences Corporation, Warren, Michigan 48090 ABSTRACT Most grid optimization methods for the boundary element method are based on a postieri error indicators and error estimators. The error indicators are a local estimate of error within each boundary element. The error estima- tor provides a global bound on the error and is calculated from the error indicators. Typically, a problem is run on a coarse grid and the local error indicators are calculated within each element. Based on the error indica- tors, a threshold value for the error indicators is selected. In an adaptive grid optimization method, those elements whose error ind

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