Conservative and sorptive forced-gradient and uniform flow tracer tests in a three-dimensional laboratory test aquifer

2004 ◽  
Vol 40 (10) ◽  
Author(s):  
Daniel Fernàndez-Garcia ◽  
Tissa H. Illangasekare ◽  
Harihar Rajaram
Keyword(s):  
Laboratory Test ◽  
Three Dimensional ◽  
Tracer Tests ◽  
Uniform Flow ◽  
Flow Tracer

Directional effects on convergent flow tracer tests

1997 ◽  
Vol 29 (4) ◽  
pp. 551-569 ◽  
Author(s):  
Xavier Sánchez-Vila ◽  
JesÚs Carrera
Keyword(s):  
Tracer Tests ◽  
Convergent Flow ◽  
Flow Tracer

scholarly journals Quantifying solute spreading and mixing in reservoir rocks using 3-D PET imaging

2016 ◽  
Vol 796 ◽  
pp. 558-587 ◽  
Author(s):  
Ronny Pini ◽  
Nicholas T. Vandehey ◽  
Jennifer Druhan ◽  
James P. O’Neil ◽  
Sally M. Benson
Keyword(s):  
Imaging Techniques ◽  
Three Dimensional ◽  
Tracer Tests ◽  
Spatial Arrangement ◽  
Small Scale ◽  
Local Dispersion ◽  
Advection Dispersion ◽  
Driving Mechanisms ◽  
Positron Emission ◽  
Longitudinal Dispersivity

We report results of an experimental investigation into the effects of small-scale (mm–cm) heterogeneities on solute spreading and mixing in a Berea sandstone core. Pulse-tracer tests have been carried out in the Péclet number regime $Pe=6{-}40$ and are supplemented by a unique combination of two imaging techniques. X-ray computed tomography (CT) is used to quantify subcore-scale heterogeneities in terms of permeability contrasts at a spatial resolution of approximately $10~\text{mm}^{3}$, while [11C] positron emission tomography (PET) is applied to image the spatial and temporal evolution of the full tracer plume non-invasively. To account for both advective spreading and local (Fickian) mixing as driving mechanisms for solute transport, a streamtube model is applied that is based on the one-dimensional advection–dispersion equation. We refer to our modelling approach as semideterministic, because the spatial arrangement of the streamtubes and the corresponding solute travel times are known from the measured rock’s permeability map, which required only small adjustments to match the measured tracer breakthrough curve. The model reproduces the three-dimensional PET measurements accurately by capturing the larger-scale tracer plume deformation as well as subcore-scale mixing, while confirming negligible transverse dispersion over the scale of the experiment. We suggest that the obtained longitudinal dispersivity ($0.10\pm 0.02$  cm) is rock rather than sample specific, because of the ability of the model to decouple subcore-scale permeability heterogeneity effects from those of local dispersion. As such, the approach presented here proves to be very valuable, if not necessary, in the context of reservoir core analyses, because rock samples can rarely be regarded as ‘uniformly heterogeneous’.

Nonlinear three-dimensional dynamics of a marine viscoelastic riser subjected to uniform flow

2018 ◽  
Vol 149 ◽  
pp. 38-52 ◽  
Author(s):  
Wenwu Yang ◽  
Zhijiu Ai ◽  
Xiaodong Zhang ◽  
Ruyi Gou ◽  
Xueping Chang
Keyword(s):  
Three Dimensional ◽  
Uniform Flow

Application of the “actuator disk” boundary condition to calculation of a non-uniform flow in the air intake of modern turbofan engines

2019 ◽  
Author(s):  
V.H. Nguyen
Keyword(s):  
Boundary Condition ◽  
Computational Study ◽  
Three Dimensional ◽  
Uniform Flow ◽  
Computational Technique ◽  
Turbofan Engines ◽  
Actuator Disk ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Air Intake

As the degree of bypass ratio of modern aviation turbofan engines increases, their appearance and characteristics change as well: the nacelle diameter increases, the air intake length decreases, and the temperature and jet noise reduce. Due to these circumstances, the design must take into account the interaction between the fan and the air intake as part of configuration. An approach based on unsteady three-dimensional modeling with account for full blade tips is necessary for the analysis, but is resource-intensive. In some cases, an approach based on the “actuator disk” boundary condition can be used to study aerodynamic interference. The paper considers a validated computational technique based on the “actuator disk” boundary condition with flow structure in front of the fan taken into account. The results of the computational study of the characteristics of the fan model in the engine nacelle are given, as well as the analysis of options for the “actuator disk” boundary condition and their application to the calculation of a non-uniform flow in the air intake under side wind conditions.

G0500-1-3 Three-Dimensional Numerical Simulation of a Spherical Particle Cluster in Uniform Flow

2010 ◽  
Vol 2010.2 (0) ◽  
pp. 257-258
Author(s):  
Kenji NAKASHIMA ◽  
Yuuki JOHNO ◽  
Takahiro YAMAUCHI ◽  
Shingo KAnAZAWA
Keyword(s):  
Numerical Simulation ◽  
Spherical Particle ◽  
Three Dimensional ◽  
Uniform Flow ◽  
Particle Cluster

scholarly journals Converging flow tracer tests in fissured limestone

2001 ◽  
Vol 34 (3) ◽  
pp. 283-297 ◽  
Author(s):  
M. S. Riley ◽  
R. S. Ward ◽  
R. B. Greswell
Keyword(s):  
Tracer Tests ◽  
Converging Flow ◽  
Flow Tracer
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