Mollification in Strongly Lipschitz Domains with Application to Continuous and Discrete De Rham Complexes

Author:

Ern Alexandre1,Guermond Jean-Luc2

Affiliation:

1. Université Paris-Est, CERMICS (ENPC), 77455 Marne-la-Vallée cedex 2, France

2. Department of Mathematics, Texas A&M University, 3368 TAMU, College Station, TX 77843, USA

Abstract

Abstract We construct mollification operators in strongly Lipschitz domains that do not invoke non-trivial extensions, are Lp stable for any real number p [ 1 , ] ${p\in [1,\infty ]}$ , and commute with the differential operators ∇, × ${\nabla {\times }}$ , and · ${\nabla {\cdot }}$ . We also construct mollification operators satisfying boundary conditions and use them to characterize the kernel of traces related to the tangential and normal trace of vector fields. We use the mollification operators to build projection operators onto general H 1-, H ( curl ) ${{H}(\mathrm {curl})}$ - and H ( div ) ${{H}(\mathrm {div})}$ -conforming finite element spaces, with and without homogeneous boundary conditions. These operators commute with the differential operators ∇, × ${\nabla {\times }}$ , and · ${\nabla {\cdot }}$ , are Lp -stable, and have optimal approximation properties on smooth functions.

Funder

National Science Foundation

Air Force Office of Scientific Research, USAF

Publisher

Walter de Gruyter GmbH

Subject

Applied Mathematics,Computational Mathematics,Numerical Analysis

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