Powered by OpenAIRE graph
Found an issue? Give us feedback
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ South Ural State Uni...arrow_drop_down
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
addClaim

This Research product is the result of merged Research products in OpenAIRE.

You have already added 0 works in your ORCID record related to the merged Research product.

Двухсеточные параллельные алгоритмы для решения дробно-дифференциальных уравнений аномальной диффузии

Authors: Lukashchuk, S. Yu.;

Двухсеточные параллельные алгоритмы для решения дробно-дифференциальных уравнений аномальной диффузии

Abstract

Приводятся описание и анализ параллельных алгоритмов решения начально- краевых задач для уравнений аномальной диффузии, содержащих производные дробного порядка типа Римана-Лиувилля по пространственным и/или временной переменным. Параллельные алгоритмы построены на основе двухсеточного подхода. При этом грубая сетка используется для расчета эффектов пространственного и временного дальнодействия с использованием сплайн-аппроксимации, а мелкая сетка служит для конечно-разностной дискретизации решаемых уравнений. Рассматриваются алгоритмы с декомпозицией как по пространству, так и по времени. Для распараллеливания по времени используется подход, предложенный в известном алгоритме PARAREAL. Приводятся теоретические оценки параллельной эффективности предложенных алгоритмов. Показано, что алгоритмы имеют сверхлинейное ускорение по сравнению с классическим последовательным конечно-разностным алгоритмом и обеспечивают тот же порядок точности вычислений при условии согласованного выбора шагов точной и грубой сеток. Также приводятся некоторые результаты вычислительных экспериментов, подтверждающие эффективность предложенных алгоритмов. New parallel algorithms are proposed for solving the initial-boundary value problems for anomalous diffusion equations with the Riemann-Liouville spatial- and/or timefractional derivatives. A two-grid technique is employed to construct these algorithms. Spline-approximation on a coarse grid is used to compute the spatial and time long-range effects, and a fine grid is used for finite-difference discretization of the fractional diffusion equations. The parallel algorithms with a spatial and a time domain decomposition are discussed separately. The approach originally developed for the Parareal algorithm is used for time domain decomposition. The theoretical estimates of the speed-up and efficiency of the proposed algorithms are given. It has been shown that the algorithms have a superlinear speed-up in comparison with a classical sequential finite-difference algorithm, and have the same accuracy if the size of a fine grid is agreed with the size of a coarse grid. Some computational results are also presented to verify the efficiency of the proposed algorithms Станислав Юрьевич Лукашук - кандидат физ.-мат. наук, доцент, кафедра "Высокопроизводительные вычислительные технологии и системы", Уфимский государственный технически университет, lsu@mail.rb.ru. S.Yu. Lukashchuk, Ufa State Aviation Technical University (Ufa, Russian Federation)

Keywords

parallel two-grid algorithm, УДК 519.642.2, двухсеточный параллельный алгоритм, anomalous diffusion, fractional differential equation, УДК 004.021, дифференциальное уравнение дробного порядка, аномальная диффузия

  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green