A method for quantifying multiscale features of solute transport in complex media
A multi-scale feature, solute transport technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as inability to describe multi-scale features, large amount of calculation, complexity, etc., and achieve a wide range of engineering application prospects, Ease of use in engineering
Active Publication Date: 2021-04-06
HOHAI UNIV
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Problems solved by technology
[0005] The above-mentioned existing patented technology methods can only describe the single-scale characteristics of non-Fickian migration in complex media, and cannot describe multi-scale characteristics
At present, some methods can describe the multi-scale characteristics of solute non-Fick transport in complex media, such as variable order fractal derivative model, variable order fractional derivative model, random order fractional derivative model, distribution order fractional derivative model etc., but these methods are more complex and require a large amount of calculation, which is not convenient for engineering application
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[0047] 1. In this embodiment, saturated Euclidean porous media and fractal porous media are selected as the research objects. The internal pore diameter of Euclidean porous media is uniformly distributed, and that of fractal porous media is non-uniformly distributed. The relationship between inhomogeneity and porosity in Euclidean porous media and fractal porous media see figure 2 . By examining the migration trajectory of 100 solute particles in the medium, the migration time is 1000 incremental steps, the size of the medium is 1000x1000 unit cells, and the smallest unit cell is 10 -6 , the porosity is 0.5, the mean square displacement R of the solute particles in the two porous media is obtained, see respectively image 3 .
[0048] 2. Use the multi-scale mobility 2 (t)>=-Ddilog(t) / c describes the mean square displacement of solute migration in Euclidean porous media, and combined with the mean square displacement data calculated in step (2), investigate Euclidean porous ...
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The invention discloses a method for quantifying the multi-scale characteristics of solute migration in a complex medium, which includes selecting a specific solute migration process in a complex medium as a research object, determining test conditions, observing the trajectory of solute particles, and obtaining the mean square of solute particles The experimental data R of the displacement, R is the set of the average distances between the positions x of all particles at time t and their respective initial points when the movement time is t; the solute transport is deduced according to the distribution order fractal derivative model or its equivalent form The multi-scale migration rate of the solute; combined with the experimental data R of the mean square displacement of solute particles, the value c of the parameter in the multi-scale migration rate is calculated; according to the value of the parameter c, the multi-scale characteristics of solute migration in complex media are obtained. Classification of migration processes. The invention has wide engineering application prospects and can be used for prediction, evaluation and treatment of pollutant migration and the like. Easier to use in engineering than existing models or techniques.
Description
technical field [0001] The invention relates to a calculation method for mesoscale characteristics of environmental fluids, in particular to a method for quantifying multiscale characteristics of solute migration in complex media. Background technique [0002] The migration process of pollutants in complex media such as soil, fractured rock mass, and concrete is an important engineering problem in the field of environmental fluids, such as deep geological storage of nuclear waste, infiltration of sewage in landfills, and aging of oil pipelines. Seepage, seawater intrusion, etc. lead to serious pollution of groundwater. Clarifying the law of solute migration in complex media can provide effective methods for the control of pollutant migration process, the restoration and treatment of polluted water and soil, and the rational development and sustainable utilization of natural resources. [0003] Usually, the complex medium is heterogeneous and anisotropic, and the movement of...
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IPC IPC(8): G06F30/25G06K9/62
CPCG06F30/20G06F18/24
Inventor 梁英杰徐伟董天驰孔洲李驿聪梁国督
Owner HOHAI UNIV