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Extending Discrete Exterior Calculus to a Fractional Derivative

Journal Article · · Computer Aided Design
 [1];  [2];  [2]
  1. Univ. of Arizona, Tucson, AZ (United States); Department of Computer Science, University of Arizona
  2. Univ. of Arizona, Tucson, AZ (United States)
Fractional partial differential equations (FDEs) are used to describe phenomena that involve a “non-local” or “long-range” interaction of some kind. Accurate and practical numerical approximation of their solutions is challenging due to the dense matrices arising from standard discretization procedures. In this paper, we begin to extend the well-established computational toolkit of Discrete Exterior Calculus (DEC) to the fractional setting, focusing on proper discretization of the fractional derivative. We define a Caputo-like fractional discrete derivative, in terms of the standard discrete exterior derivative operator from DEC, weighted by a measure of distance between $$p$$-simplices in a simplicial complex. We discuss key theoretical properties of the fractional discrete derivative and compare it to the continuous fractional derivative via a series of numerical experiments.
Research Organization:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Grant/Contract Number:
SC0019039
OSTI ID:
1544812
Journal Information:
Computer Aided Design, Journal Name: Computer Aided Design Journal Issue: C Vol. 114; ISSN 0010-4485
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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