Mollification in Strongly Lipschitz Domains with Application to Continuous and Discrete De Rham Complexes
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 ∇, ∇ × ${ abla {\times }}$ , and ∇ · ${ abla {\cdot }}$ . 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 ∇, ∇ × ${ abla {\times }}$ , and ∇ · ${ abla {\cdot }}$ , are Lp -stable, and have optimal approximation properties on smooth functions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 15, 2015
- Source ID
- 10.1515/cmam-2015-0034
Entities
People
- Alexandre Ern
- Jean-luc Guermond
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Texas A&M University
- UniverSud Paris