scholarly journals Grout diffusion model in porous media considering the variation in viscosity with time

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881989 ◽  
Author(s):  
Fujin Hou ◽  
Keguo Sun ◽  
Qingdong Wu ◽  
Weiping Xu ◽  
Sijia Ren
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Diffusion Model ◽  
Design Process ◽  
Simulation Method ◽  
Flow Equation ◽  
Diffusion Mode ◽  
Research Results ◽  
Perforated Pipe ◽  
Over Time

Grouting engineering is widely used in water plugging for geotechnical engineering. However, grout is usually treated as a Newton fluid and the viscosity is considered unchangeable over time during the grouting design process. This study proposes a grout diffusion model for porous media that considers the variation in viscosity with time. The flow equation is derived for a single smooth tubule. Then, the microequation of Bingham grout flowing in porous media is obtained. Finally, an assembled diffusion model of spheres and cylinders for grouting using a perforated pipe is proposed. A numerical simulation method is used to verify the grout diffusion mode. The research results can guide grouting design and practical grouting engineering in water plugging and reinforcement.

The Effect Analysis of Fin Arrangement on Thermal Hydraulic Performance of a Vehicular Cooler

2013 ◽  
Vol 712-715 ◽  
pp. 1600-1604
Author(s):  
Jing Zhao ◽  
Bao Lan Xiao ◽  
Wei Ming Wu ◽  
Xiao Li Yu ◽  
Guo Dong Lu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluid Flow ◽  
Design Process ◽  
Simulation Method ◽  
Effect Analysis ◽  
Performance Requirements ◽  
Flow And Heat Transfer ◽  
Stability Structure ◽  
Safety And Stability

The excellent thermal hydraulic performances of coolers are the foundations of vehicular safety and stability. Structure, material, fin type and arrangement all have important effects on the thermal hydraulic performances. Numerical simulation method was adopted in this paper to investigate the effect of fin arrangement. The fluid flow and heat transfer performances were contrasted and analyzed under two different fin arrangements. It was found that fin arrangement effected thermal hydraulic performances severely and during the design process of a cooler, the performance requirements could be met through adjusting fin arrangements.

scholarly journals SPH Simulation of Interior and Exterior Flow Field Characteristics of Porous Media

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 918 ◽  
Author(s):  
Shijie Wu ◽  
Matteo Rubinato ◽  
Qinqin Gui
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Flow Field ◽  
Boundary Conditions ◽  
Water Waves ◽  
Flow Behavior ◽  
Simulation Method ◽  
Interface Problem ◽  
Ocean Engineering ◽  
Flow Field Characteristics

At the present time, one of the most relevant challenges in marine and ocean engineering and practice is the development of a mathematical modeling that can accurately replicate the interaction of water waves with porous coastal structures. Over the last 60 years, multiple techniques and solutions have been identified, from linearized solutions based on wave theories and constant friction coefficients to very sophisticated Eulerian or Lagrangian solvers of the Navier-Stokes (NS) equations. In order to explore the flow field interior and exterior of the porous media under different working conditions, the Smooth Particle Hydrodynamics (SPH) numerical simulation method was used to simulate the flow distribution inside and outside a porous media applied to interact with the wave propagation. The flow behavior is described avoiding Euler’s description of the interface problem between the Euler mesh and the material selected. Considering the velocity boundary conditions and the cyclical circulation boundary conditions at the junction of the porous media and the water flow, the SPH numerical simulation is used to analyze the flow field characteristics, as well as the longitudinal and vertical velocity distribution of the back vortex flow field and the law of eddy current motion. This study provides innovative insights on the mathematical modelling of the interaction between porous structures and flow propagation. Furthermore, there is a good agreement (within 10%) between the numerical results and the experimental ones collected for scenarios with porosity of 0.349 and 0.475, demonstrating that SPH can simulate the flow patterns of the porous media, the flow through the inner and outer areas of the porous media, and the flow field of the back vortex region. Results obtained and the new mathematical approach used can help to effectively simulate with high-precision the changes along the water depth, for a better design of marine and ocean engineering solutions adopted to protect coastal areas.

Numerical simulation of Nusselt-Rayleigh correlation in Bénard cells. A solution based on the network simulation method

2015 ◽  
Vol 25 (5) ◽  
pp. 986-997 ◽  
Author(s):  
Manuel Cánovas ◽  
Iván Alhama ◽  
Emilio Trigueros ◽  
Francisco Alhama
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Porous Media ◽  
Design Methodology ◽  
Network Simulation ◽  
Simulation Method ◽  
Extensive Study ◽  
Dimensionless Number ◽  
Content Type ◽  
Network Simulation Method

Purpose – Natural convection with heat transfer in porous media has been subject of extensive study in engineering due to its numerous applications. A case of particular interest is the Bénard-type flow.The paper aims to discuss this issue. Design/methodology/approach – Based on the network simulation method in order to solve this problem, a numerical model is proposed. Findings – Nusselt-Rayleigh correlation is determined for a broad range of Rayleigh, the dimensionless number that influences the solution, above and below the threshold which separates the conduction and convection pure mechanisms. Originality/value – Based on the network simulation method.

Design and Aerodynamic Characteristics Study of a Spherical Aircraft

2013 ◽  
Vol 662 ◽  
pp. 612-615
Author(s):  
Peng Li ◽  
Yan Heng Zhang ◽  
Han Xu Sun ◽  
Hao Pan
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Aerodynamic Characteristics ◽  
Aircraft Structure ◽  
Research Results ◽  
Aerodynamic Model ◽  
Numerical Simulation Method ◽  
Cfd Numerical Simulation

In order to achieve the goals of small aircraft’s taking off and landing in any posture and the protection of propeller, a new single-propeller spherical aircraft structure was proposed, which had the capacity of flying in the air and walking on the ground simultaneously. An aerodynamic model of the aircraft was built. The aerodynamic characteristics of the spherical aircraft, including the lift and the anti-torque and the generated torque of the flow deflectors under the propeller’s down airflow, are studied in depth by means of CFD numerical simulation method. A reasonable design and installation program is proposed according to the research results.

Experimental and Numerical Investigation of CO2 Injection into Water-Saturated Porous Media: Effect of Capillary Pressure on Displacement Efficiency

2012 ◽  
Vol 229-231 ◽  
pp. 163-166
Author(s):  
Ming Long Zhao ◽  
Da Yong Wang ◽  
Xiao Jing Ma ◽  
Hu Shan Xu
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Capillary Pressure ◽  
Simulation Method ◽  
Saturated Porous Media ◽  
Displacement Efficiency ◽  
Media Effect ◽  
Water Displacement ◽  
Water Saturated ◽  
Storage Technologies

CO2sequestration in deep saline aquifers is regard as the most promising option among all the CO2storage technologies. Capillary pressure can influence the CO2storage efficiency in the aquifers. The core-scale experimental and numerical simulation studies are usually used to understand the mechanism and degree of such influence. Based on both magnetic resonance imaging (MRI) technique and numerical simulation method, this study investigates the effect of capillary pressure on the CO2displacement efficiency in water-saturated porous media especially in quantitative form. Our results indicate: (1) the magnitude of capillary pressure may significantly affect the CO2-water displacement efficiency, and the displacement efficiency declines with increasing capillary pressure; (2) Sensitivity of the numerical model to capillary pressure becomes more unobvious with increasing capillary pressure. Thus, an accurate capillary pressure parameter is particularly required for improving the reliability of the model predictions in the case of the high permeability porous media.

Porous media: A faster numerical simulation method applicable to real urban communities

Urban Climate ◽  
2021 ◽  
Vol 38 ◽  
pp. 100865
Author(s):  
Heting Wang ◽  
Chong Peng ◽  
Wenyu Li ◽  
Chao Ding ◽  
Tingzhen Ming ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Porous Media ◽  
Urban Communities ◽  
Simulation Method ◽  
Numerical Simulation Method

scholarly journals A Coupled Thermal-Hydraulic-Mechanical Nonlinear Model for Fault Water Inrush

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 120 ◽  
Author(s):  
Weitao Liu ◽  
Jiyuan Zhao ◽  
Ruiai Nie ◽  
Yuben Liu ◽  
Yanhui Du
Keyword(s):  
Numerical Simulation ◽  
Fault Zone ◽  
Water Flow ◽  
Water Inrush ◽  
Great Influence ◽  
Simulation Method ◽  
Coupling Model ◽  
Flow Equation ◽  
Nonlinear Flow ◽  
Flow Process

A coupled thermal-nonlinear hydraulic-mechanical (THM) model for fault water inrush was carried out in this paper to study the water-rock-temperature interactions and predict the fault water inrush. First, the governing equations of the coupled THM model were established by coupling the particle transport equation, nonlinear flow equation, mechanical equation, and the heat transfer equation. Second, by setting different boundary conditions, the mechanical model, nonlinear hydraulic-mechanical (HM) coupling model, and the thermal-nonlinear hydraulic-mechanical (THM) coupling model were established, respectively. Finally, a numerical simulation of these models was established by using COMSOL Multiphysics. Results indicate that the nonlinear water flow equation could describe the nonlinear water flow process in the fractured zone of the fault. The mining stress and the water velocity had a great influence on the temperature of the fault zone. The temperature change of the fault zone can reflect the change of the seepage field in the fault and confined aquifer. This coupled THM model can provide a numerical simulation method to describe the coupled process of complex geological systems, which can be used to predict the fault water inrush induced by coal mining activities.

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