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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

Stream functions for divergence-free vector fields


Author: James P. Kelliher
Journal: Quart. Appl. Math. 79 (2021), 163-174
MSC (2010): Primary 35F15, 35Q35; Secondary 26B12
DOI: https://doi.org/10.1090/qam/1575
Published electronically: June 18, 2020
MathSciNet review: 4188627
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Abstract: In 1990, von Wahl and, independently, Borchers and Sohr showed that a divergence-free vector field $u$ in a 3D bounded domain that is tangential to the boundary can be written as the curl of a vector field vanishing on the boundary of the domain. We extend this result to higher dimension and to Lipschitz boundaries in a form suitable for integration in flat space, showing that $u$ can be written as the divergence of an antisymmetric matrix field. We also demonstrate how obtaining a kernel for such a matrix field is dual to obtaining a Biot-Savart kernel for the domain.


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Additional Information

James P. Kelliher
Affiliation: Department of Mathematics, University of California, Riverside, 900 University Avenue, Riverside, California 92521
MR Author ID: 744311
Email: kelliher@math.ucr.edu

Received by editor(s): May 22, 2020
Published electronically: June 18, 2020
Article copyright: © Copyright 2020 Brown University