کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
521241 867759 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Random walk particle tracking simulations of non-Fickian transport in heterogeneous media
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Random walk particle tracking simulations of non-Fickian transport in heterogeneous media
چکیده انگلیسی

Derivations of continuum nonlocal models of non-Fickian (anomalous) transport require assumptions that might limit their applicability. We present a particle-based algorithm, which obviates the need for many of these assumptions by allowing stochastic processes that represent spatial and temporal random increments to be correlated in space and time, be stationary or non-stationary, and to have arbitrary distributions. The approach treats a particle trajectory as a subordinated stochastic process that is described by a set of Langevin equations, which represent a continuous time random walk (CTRW). Convolution-based particle tracking (CBPT) is used to increase the computational efficiency and accuracy of these particle-based simulations. The combined CTRW–CBPT approach enables one to convert any particle tracking legacy code into a simulator capable of handling non-Fickian transport.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 229, Issue 11, 1 June 2010, Pages 4304–4314
نویسندگان
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