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Title: Towards a Unified theory of Fractional and Nonlocal Vector Calculus

Journal Article · · Fractional Calculus and Applied Analysis
 [1];  [2];  [3];  [4]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
  3. Brown Univ., Providence, RI (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Nonlocal and fractional-order models capture effects that classical partial differential equations cannot describe; for this reason, they are suitable for a broad class of engineering and scientific applications that feature multiscale or anomalous behavior. This has driven a desire for a vector calculus that includes nonlocal and fractional gradient, divergence and Laplacian type operators, as well as tools such as Green’s identities, to model subsurface transport, turbulence, and conservation laws. In the literature, several independent definitions and theories of nonlocal and fractional vector calculus have been put forward. Some have been studied rigorously and in depth, while others have been introduced ad-hoc for specific applications. The goal of this work is to provide foundations for a unified vector calculus by (1) consolidating fractional vector calculus as a special case of nonlocal vector calculus, (2) relating unweighted and weighted Laplacian operators by introducing an equivalence kernel, and (3) proving a form of Green’s identity to unify the corresponding variational frameworks for the resulting nonlocal volume-constrained problems. Here, the proposed framework goes beyond the analysis of nonlocal equations by supporting new model discovery, establishing theory and interpretation for a broad class of operators, and providing useful analogues of standard tools from the classical vector calculus.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Brown Univ., Providence, RI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE National Nuclear Security Administration (NNSA); US Army Research Office (ARO)
Grant/Contract Number:
AC05-76RL01830; NA0003525; W911NF-15-1-0562; SC0019453
OSTI ID:
1897197
Alternate ID(s):
OSTI ID: 2282020
Report Number(s):
PNNL-SA-178937
Journal Information:
Fractional Calculus and Applied Analysis, Vol. 24, Issue 5; ISSN 1311-0454
Publisher:
de GruyterCopyright Statement
Country of Publication:
United States
Language:
English

References (64)

Fractional vector calculus for fractional advection–dispersion journal July 2006
On a new class of fractional partial differential equations II journal July 2018
Convergence studies in meshfree peridynamic simulations journal June 2016
How to Approximate the Heat Equation with Neumann Boundary Conditions by Nonlocal Diffusion Problems journal November 2007
Multiscaling fractional advection-dispersion equations and their solutions: MULTISCALING FRACTIONAL ADES journal January 2003
An energy-based coupling approach to nonlocal interface problems journal July 2020
A conservative nonlocal convection–diffusion model and asymptotically compatible finite difference discretization journal June 2017
Two-point stress–strain-rate correlation structure and non-local eddy viscosity in turbulent flows journal March 2021
The restaurant at the end of the random walk: recent developments in the description of anomalous transport by fractional dynamics journal July 2004
Nonlocal gradient operators with a nonspherical interaction neighborhood and their applications journal January 2020
Aspects of an adaptive finite element method for the fractional Laplacian: a priori and a posteriori error estimates, efficient implementation and multigrid solver text January 2017
Fractional vector calculus and fractional Maxwell’s equations journal November 2008
Numerical methods for nonlocal and fractional models journal May 2020
Fractional Diffusion on Bounded Domains journal January 2015
Kinetics of phase transformations in the peridynamic formulation of continuum mechanics journal September 2006
Fractional calculus and continuous-time finance journal September 2000
Identification of the Diffusion Parameter in Nonlocal Steady Diffusion Problems journal May 2015
A Nonlocal Vector Calculus with Application to Nonlocal Boundary Value Problems journal January 2010
Characterization of function spaces of vector fields and an application in nonlinear peridynamics journal July 2016
Image Recovery via Nonlocal Operators journal August 2009
Peridynamics and Material Interfaces journal January 2015
Boundary Problems for the Fractional and Tempered Fractional Operators journal January 2018
nPINNs: Nonlocal physics-informed neural networks for a parametrized nonlocal universal Laplacian operator. Algorithms and applications journal December 2020
Data-driven learning of nonlocal physics from high-fidelity synthetic data journal February 2021
Aspects of an adaptive finite element method for the fractional Laplacian: A priori and a posteriori error estimates, efficient implementation and multigrid solver journal December 2017
fPINNs: Fractional Physics-Informed Neural Networks journal January 2019
Mathematics of Smoothed Particle Hydrodynamics: A Study via Nonlocal Stokes Equations journal August 2019
What is the fractional Laplacian? A comparative review with new results journal March 2020
Fractional div-curl quantities and applications to nonlocal geometric equations journal July 2018
Towards an Efficient Finite Element Method for the Integral Fractional Laplacian on Polygonal Domains book January 2018
A Riesz Basis Galerkin Method for the Tempered Fractional Laplacian journal January 2018
Application of a fractional advection-dispersion equation journal February 2000
Image Denoising Methods. A New Nonlocal Principle journal January 2010
Analysis of the Volume-Constrained Peridynamic Navier Equation of Linear Elasticity journal November 2012
A Nonlocal Vector Calculus, Nonlocal Volume-Constrained Problems, and Nonlocal Balance laws journal January 2013
Helmholtz-Hodge Decompositions in the Nonlocal Framework journal July 2020
Fractional vector analysis based on invariance requirements (critique of coordinate approaches) journal June 2019
A generalized nonlocal vector calculus journal March 2015
Nonlocal Constrained Value Problems for a Linear Peridynamic Navier Equation journal August 2013
Stability of peridynamic correspondence material models and their particle discretizations journal August 2017
Discovering variable fractional orders of advection–dispersion equations from field data using multi-fidelity Bayesian optimization journal November 2017
Analysis of a nonlocal-in-time parabolic equation journal January 2017
Stability of Nonlocal Dirichlet Integrals and Implications for Peridynamic Correspondence Material Modeling journal January 2018
On Riesz Derivative journal April 2019
On some composition formulas journal January 1959
A peridynamic formulation of pressure driven convective fluid transport in porous media journal March 2014
The exit-time problem for a Markov jump process journal December 2014
Multiscale Dynamics of Heterogeneous Media in the Peridynamic Formulation journal December 2010
Nonlocal problems with Neumann boundary conditions journal January 2017
Fractional curl operator in electromagnetics journal February 1998
The random walk's guide to anomalous diffusion: a fractional dynamics approach journal December 2000
The Dirichlet problem for nonlocal operators journal November 2014
Tempered fractional calculus journal July 2015
The fractional Laplacian operator on bounded domains as a special case of the nonlocal diffusion operator journal October 2013
Nonlocal Operators with Applications to Image Processing journal January 2009
How to approximate the heat equation with Neumann boundary conditions by nonlocal diffusion problems preprint January 2006
A meshfree method based on the peridynamic model of solid mechanics journal June 2005
A direct O(Nlog2N) finite difference method for fractional diffusion equations journal October 2010
The fractional Laplacian operator on bounded domains as a special case of the nonlocal diffusion operator preprint January 2013
Nonlocal Linear Image Regularization and Supervised Segmentation journal January 2007
Eulerian derivation of the fractional advection–dispersion equation journal March 2001
Analysis and Approximation of Nonlocal Diffusion Problems with Volume Constraints journal January 2012
Calculus On Manifolds book January 1965
On a new class of fractional partial differential equations journal May 2014