Journal
APPLIED MATHEMATICS AND COMPUTATION
Volume 391, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.amc.2020.125627
Keywords
Memory-dependent derivative (MDD); Fractional derivative (FD); Memory effect; Heat conduction equation; Maxwell-Cattaneo model; Time-space diffusion
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MDD, as a new substitute for FD, better reflects memory effects and is more reasonable in modeling heat diffusion processes. It offers flexibility in choosing memory times and weighted functions for different media, making it suitable for exploring various diffusion problems.
The memory-dependent derivative (MDD) is a new substitution for the fractional derivative (FD). It reflects the memory effect in a more distinct way. As an application, the represen-tative heat diffusion process is remodeled with it. In fact, due to the existence of heat conduction paradox, the time-space evolution mechanisms of this process are challenges to the modelers. The paradox cann't be ascribed to the classical Fourier law, and the results show that the newly-constructed temporal MDD model is more reasonable than the Maxwell-Cattaneo, the temporal FD, the spatial FD and the common ones. Moreover, different mediums may accord with different memory times and weighted functions. This freedom of choice reflects the flexibility of MDD in modelling. It can be borrowed for exploring other diffusion problems. (c) 2020 Published by Elsevier Inc.
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