ICY: An interface between COMSOL multiphysics and discrete element code YADE for the modelling of porous media

Pirnia, Pouyan; Duhaime, François; Ethier, Yannic; Dubé, Jean-Sébastien

doi:10.1016/j.cageo.2018.11.002

Cited by 18 publications

(7 citation statements)

References 26 publications

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“…The survey area is in the sponge city. In order to absorb the rainfall of different confluence rates, the two sponge cities provide basis for research and experiment based on the original foundation, existing buildings, laboratories, and surrounding environment, to study whether concentrated infiltration will affect groundwater (Pirnia et al 2019). The confluence rate, impermeability and impermeability countermeasures, the thickness of the water-carrying layer, and the location, number, and depth of the groundwater observation wells in the two sponge cities are all designed and monitored according to regional conditions (Potyondy 2012).…”

Section: Overview Of the Study Areamentioning

confidence: 99%

RETRACTED ARTICLE: Analysis of sponge city water pollution characteristics and urban music emotional expression based on GIS system

Zhang

2021

Arab J Geosci

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During the construction of the sponge city, the impact of rainwater facilities on the underground is very important, so it has received great attention. These rainwater facilities can affect groundwater quality and water level and are currently the focus of international personnel. This thesis focuses on the impact of concentrated rainwater infiltration on groundwater level and water quality and focuses on two methods of on-site monitoring and simulation prediction of rainwater infiltration wells in sponge cities. This study collected meteorological, hydrological, and geological conditions. From May to October 2018 and June to December 2020, the deep burying of some underground wells in sponge city was monitored, and groundwater samples were collected to determine the content of TN, NO 3 -N, NH 4 + -N, and TP. Then, the existing monitoring wells were used in sponge city to establish a conceptual model of groundwater, conduct sensitivity analysis on the generalization of hydrogeological parameters, and predict the depth of burial in the future water level. As the process of urbanization in China continues to accelerate, the exogenous indicators represented by the urban population are no longer sufficient to reflect the deep connotation of the process of urbanization in China. Therefore, as an endogenous motivation, the audience's sense of belonging to the city and the identification of the city's identity have increasingly become an important topic for scholars when discussing the process of urbanization in China. Urban music is just one of the cultural microcosms of the process of urbanization in China. It not only gives the city a field of expression outside the physical space and effectively connects the two subjects of the city and the audience but also enables the audience to listen to and interpret urban music, to continuously enhance the sense of belonging to the city and construct the identity of the city.

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Section: Overview Of the Study Areamentioning

confidence: 99%

RETRACTED ARTICLE: Analysis of sponge city water pollution characteristics and urban music emotional expression based on GIS system

Zhang

2021

Arab J Geosci

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“…Richards' equation is usually used to simulate the unsaturated fluid flow in porous media. Its analytical expressions by Van Genuchten, Brooks, and Corey can be used for seepage simulation, in which the hydraulic characteristics vary as the fluid traverses the porous medium (Pirnia et al, 2019). The Navier–Stokes equation describes the groundwater flow under the effects of gravity, viscous resistance, and pressure gradient.…”

Section: Numerical Analysis Of Spewing In the Screw Conveyormentioning

confidence: 99%

Numerical investigation on the spewing mechanism of earth pressure balance shield in a high‐pressure water‐rich sand stratum

Yang

Ding

et al. 2023

Deep Underground Science and Engineering

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The spewing of a screw conveyor easily occurs from the earth pressure balance (called EPB) shield in a water-rich sand stratum. This may lead to the collapse of the tunnel face and even serious subsidence of the ground surface. To understand the spewing mechanism of the shield screw conveyor and explore the critical hydraulic condition of soil spewing in a shield-soil chamber, a simplified theoretical model for the spewing of the screw conveyor was developed based on the equation of groundwater flow in the screw conveyor under turbulent state. Thus, coupling Darcy's law with Brinkman's equation, this model was implemented within the COMSOL Multiphysics framework. The underground water flow in the shield screw conveyor was simulated so as to obtain its velocity and flow rate. Numerical simulations show that the water pressure distribution is concentrated in the lower part of the soil chamber after the groundwater enters the soil chamber. When the groundwater enters the screw conveyor, its pressure gradually decreases along the direction of the screw conveyor. When the water flow reaches the stratum-shield interface, the flow velocity changes markedly: first increases and concentrates at the entrance of the lower soil chamber, plummets and stabilizes gradually, and increases again at the exit. The soil chamber and screw conveyor are significantly depressurized. It is also found that the soil permeability coefficient can be reduced to k < 2.6 × 10 −4 cm/s through appropriate soil improvement, which can effectively prevent the occurrence of spewing disasters.

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“…The list was obtained by considering all possible weight percentage combinations with 5 % increments for 5 sieves (106, 150, 250, 425 and 710 µm). COMSOL's Java interface was used to read the data and control YADE's python interface to generate the DE specimen [30]. The particles were created in a transparent virtual box.…”

Section: Synthetic Granular Image Datasetmentioning

confidence: 99%

Predicting the Particle Size Distributions of Spherical Particle Sets from Synthetic Images: A Comparison of 9 Classic Image Features

Manashti¹,

Duhaime²,

Toews³

et al. 2022

Preprint

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The two objectives of this paper were to demonstrate use the of the discrete element method for generating synthetic images of spherical particle configurations, and to compare the performance of 9 classic feature extraction methods for predicting the particle size distributions (PSD) from these images. The discrete element code YADE was used to generate synthetic images of granular materials to build the dataset. Nine feature extraction methods were compared: Haralick features, Histograms of Oriented Gradients, Entropy, Local Binary Patterns, Local Configuration Pattern, Complete Local Binary Patterns, the Fast Fourier transform, Gabor filters, and Discrete Haar Wavelets. The feature extraction methods were used to generate the inputs of neural networks to predict the PSD. The results show that feature extraction methods can predict the percentage passing with a root-mean-square error (RMSE) on the percentage passing as low as 1.7%. CLBP showed the best result for all particle sizes with a RMSE of 3.8 %. Better RMSE were obtained for the finest sieve (2.1%) compared to coarsest sieve (5.2%).

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ICY: An interface between COMSOL multiphysics and discrete element code YADE for the modelling of porous media

Cited by 18 publications

References 26 publications

RETRACTED ARTICLE: Analysis of sponge city water pollution characteristics and urban music emotional expression based on GIS system

RETRACTED ARTICLE: Analysis of sponge city water pollution characteristics and urban music emotional expression based on GIS system

Numerical investigation on the spewing mechanism of earth pressure balance shield in a high‐pressure water‐rich sand stratum

Predicting the Particle Size Distributions of Spherical Particle Sets from Synthetic Images: A Comparison of 9 Classic Image Features

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