Role of macroporosity in runoff generation on a sloping subsurface drained clay field — a case study with MACRO model

2008 ◽  
Vol 39 (2) ◽  
pp. 143-155 ◽  
Author(s):  
Salka Hintikka ◽  
Maija Paasonen-Kivekäs ◽  
Harri Koivusalo ◽  
Visa Nuutinen ◽  
Laura Alakukku
Keyword(s):  
Surface Runoff ◽  
Soil Structure ◽  
Three Dimensional ◽  
Runoff Generation ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Drain Flow ◽  
Extensive Field ◽  
Sloping Field

Macroporosity and its effect on runoff processes were studied on a sloping subdrained clay field (very fine Aeric Cryaquept) in Southern Finland. An extensive field campaign was carried out to measure the spatial variability of soil macroporosity and hydraulic properties. According to the field data, macropore conductivity decreased with depth and soil properties showed differences between the upper and lower parts of the field. A one-dimensional model (MACRO) was applied to quantify the effect of these differences on the hydrological response of the upper and lower field sites. Based on the measurements, five separate parameterizations characterizing the differences in soil structure between the measurement sites were formulated. The change in soil structure had a great effect on the relative proportions of simulated drain flow and surface runoff but influenced only slightly the total amount of runoff. Evapotranspiration and percolation were similar in all cases. Examining model simulations, measured runoff components and groundwater table suggested that a two- or three-dimensional modeling approach is necessary, when prediction of proportional fractions of drain flow and surface runoff, and simulation of groundwater level in a sloping field are of interest.

scholarly journals Microstructure Aware Modeling Of Biochemical Transport In Arterial Blood Clots

2021 ◽  
Author(s):  
Chayut Teeraratkul ◽  
Debanjan Mukherjee
Keyword(s):  
Three Dimensional ◽  
Fictitious Domain ◽  
Advective Transport ◽  
Continuum Approach ◽  
Species Transport ◽  
Three Dimensional Modeling ◽  
Arterial Blood ◽  
Dimensional Modeling ◽  
Blood Clots

AbstractFlow-mediated transport of biochemical species is central to thrombotic phenomena. Comprehensive three-dimensional modeling of flow-mediated transport around realistic macroscale thrombi poses challenges owing to their arbitrary heterogeneous microstructure. Here, we develop a microstructure aware model for species transport within and around a macroscale thrombus by devising a custom preconditioned fictitious domain formulation for thrombus-hemodynamics interactions, and coupling it with a fictitious domain advection-diffusion formulation for transport. Microstructural heterogeneities are accounted through a hybrid discrete particle-continuum approach for the thrombus interior. We present systematic numerical investigations on unsteady arterial flow within and around a three-dimensional macroscale thrombus; demonstrate the formation of coherent flow structures around the thrombus which organize advective transport; illustrate the role of the permeation processes at the thrombus boundary and subsequent intra-thrombus transport; and characterize species transport from bulk flow to the thrombus boundary and vice versa.

Interaction Deep Excavation – Adjacent Structure: Numerical Two and Three Dimensional Modeling

2011 ◽  
Vol 324 ◽  
pp. 344-347 ◽  
Author(s):  
M. Abdallah ◽  
Fadi Hage Chehade ◽  
Walid Chehade ◽  
A. Fawaz
Keyword(s):  
Soil Structure ◽  
Three Dimensional ◽  
Material Structure ◽  
Deep Excavation ◽  
The Finite Element Method ◽  
Soil Behavior ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Adjacent Structure ◽  
Comparison Of The Results

Urban development often requires the construction of deep excavations near to buildings or other structures. We have to study complex material structure interactions where we should take into consideration several particularities. In this paper, we perform a numerical modeling with the finite element method, using PLAXIS software, of the interaction deep excavation-diaphragm wall-soil-structure in the case of non linear soil behavior. We focus our study on a comparison of the results given respectively by two and three dimensional modelings. This allows us to give some recommendations concerning the validity of twodimensional study. We perform a parametric study according to the initial loading on the structure and the struts number.

scholarly journals BUILDING A THREE-DIMENSIONAL MODEL OF AXIAL JET IN SOLIDWORKS

2019 ◽  
Vol 7 ◽  
pp. 76-79
Author(s):  
Vladimir Papulov
Keyword(s):  
Computer Simulation ◽  
Three Dimensional ◽  
Machine Building ◽  
Water Jet ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Building Orientation

The article provides a brief description of the construction of the main parts of the three-dimensional model of the axial water jet, followed by their Assembly into the finished product. The role of computer simulation in the design of complex types of propellers, which include water jet, is shown. The possibility of solving problems of hydrodynamics with the help of "SolidWorks"is demonstrated. The design of the water jet pipe, taking into account the absence of cavitation. The urgency of application of three-dimensional modeling in the field of shipbuilding, using CAD-programs of machine-building orientation is shown.

scholarly journals Application of 3D Modeling Technology in Engineering Graphics

2021 ◽  
Vol 2074 (1) ◽  
pp. 012079
Author(s):  
Yan Zhang ◽  
Qinghua Li ◽  
Chunshan He ◽  
Liai Pan
Keyword(s):  
3D Modeling ◽  
Design Method ◽  
Three Dimensional ◽  
Modeling Technology ◽  
Teaching Reform ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Engineering Drawings ◽  
The Times

Abstract With the development of technology and the progress of the times, the application methods and expression methods (including teaching methods) of engineering drawings have undergone tremendous changes. This article analyzes the reasons that restrict the three-dimensional design method can not completely replace the two-dimensional drawing in the short term, and proposes the teaching reform direction that combines the three-dimensional modeling with the traditional graphics content. It clarifies the role of 3D modeling content in graphics courses at this stage, and explains the specific methods of introducing 3D modeling in different stages of graphics courses and the choice of teaching software.

scholarly journals ON THE QUESTION OF AIR VELOCITY AND PRESSURE IN AN INERTIAL CONCENTRATOR

2020 ◽  
pp. 101-109
Author(s):  
A. Agarkov ◽  
R. Sharapov
Keyword(s):  
Three Dimensional ◽  
Flow Characteristics ◽  
Dust Particles ◽  
Air Velocity ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Air Supply ◽  
Fractional Efficiency ◽  
The Moment

Various designs of inertial concentrators for cleaning dusty air are considered. The analyzed designs of devices for separating dust particles by fractions also have a number of disadvantages: low fractional efficiency and complexity of structures when divided into several fractions. The design of an inertial dust concentrator with adjustable parameters is proposed. This design of the concentrator provides an increase in fractional efficiency and a decrease in hydraulic resistance with the simplicity of the apparatus design. Three-dimensional modeling of the spatial motion of air in an inertial dust concentrator with adjustable parameters is performed. A system of equations describing gas-dynamic flows is given. The results of calculations of velocity and pressure in an inertial dust concentrator with adjustable parameters are presented. Reflecting vanes and a false wall inside an inertial concentrator act as deflectors, that is, deflect the flow, which leads to an increase in the time spent by suspended particles in the inertial concentrator and a decrease in their kinetic energy. In this case, the role of inertia forces on the motion of particles will increase. Numerical modeling of the three-dimensional air flow in the concentrator made it possible to obtain a flow pattern and the main flow characteristics (velocity and pressure) from the moment of air supply to the concentrator to the moment of establishing the flow.

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