WinGridder - An interactive grid generator for TOUGH - A user's manual (Version 1.0)

Pan, Lehua; Hinds, Jennifer; Haukwa, C.; Wu, Yu‐Shu; Bodvarsson, G.S.

doi:10.2172/788007

Cited by 7 publications

(5 citation statements)

References 4 publications

(5 reference statements)

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“…The three‐dimensional numerical model grid used in this study is shown in plan view in Fig. 2 The three‐dimensional model grid was generated from an integral finite‐difference scheme (Pan et al, 2000) using an irregular, unstructured, three‐dimensional control‐volume spatial discretization. As shown in Fig.…”

Section: Modeling Approach and Numerical Modelmentioning

confidence: 99%

Estimating Large‐Scale Fracture Permeability of Unsaturated Rock Using Barometric Pressure Data

Zhang

Liu

2006

Vadose Zone Journal

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We present a three-dimensional modeling study of gas flow in the unsaturated fractured rock of Yucca Mountain. Our objective is to estimate large-scale fracture permeability, using the changes in subsurface pneumatic pressure in response to barometric pressure changes at the land surface. We incorporate the field-measured pneumatic data into a multiphase flow model for describing the coupled processes of liquid and gas flow under ambient geothermal conditions. Comparison of field-measured pneumatic data with model-predicted gas pressures is found to be a powerful technique for estimating the fracture permeability of the unsaturated fractured rock, which is otherwise extremely difficult to determine on the large scales of interest. In addition, this study demonstrates that the multi-dimensional-flow effect on estimated permeability values is significant and should be included when determining fracture permeability in heterogeneous fractured media.

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Section: Modeling Approach and Numerical Modelmentioning

confidence: 99%

Estimating Large‐Scale Fracture Permeability of Unsaturated Rock Using Barometric Pressure Data

Zhang

Liu

2006

Vadose Zone Journal

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“…A radial symmetric grid was created to describe the entire aquifer system in the CAESA system using the mesh generator Wingridder [27]. To eliminate boundary effects, the radial domain of the model covers 1000 m away from the centre wellbore.…”

Section: Grid Designmentioning

confidence: 99%

Numerical Investigation of the Influences of Wellbore Flow on Compressed Air Energy Storage in Aquifers

Zhang

et al. 2017

Geofluids

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With the blossoming of intermittent energy, compressed air energy storage (CAES) has attracted much attention as a potential largescale energy storage technology. Compared with caverns as storage vessels, compressed air energy storage in aquifers (CAESA) has the advantages of wide availability and lower costs. The wellbore can play an important role as the energy transfer mechanism between the surroundings and the air in CAESA system. In this paper, we investigated the influences of the well screen length on CAESA system performance using an integrated wellbore-reservoir simulator (T2WELL/EOS3). The results showed that the well screen length can affect the distribution of the initial gas bubble and that a system with a fully penetrating wellbore can obtain acceptably stable pressurized air and better energy efficiencies. Subsequently, we investigated the impact of the energy storage scale and the target aquifer depth on the performance of a CAESA system using a fully penetrating wellbore. The simulation results demonstrated that larger energy storage scales exhibit better performances of CAESA systems. In addition, deeper target aquifer systems, which could decrease the energy loss by larger storage density and higher temperature in surrounding formation, can obtain better energy efficiencies.

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“…The remaining layers have a thickness of 1 m, except the layers above the riverbed and below the laterals, which are slightly thicker. The mesh ( Figure 3b) was generated using WinGridder (Pan et al 2001). It consists of about 25,000 grid blocks, with higher resolution around the collectors and in the riverbed area.…”

Section: Forward Model Setupmentioning

confidence: 99%

Factors Governing Sustainable Groundwater Pumping near a River

2010

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The objective of this paper is to provide new insights into processes affecting riverbank filtration (RBF). We consider a system with an inflatable dam installed for enhancing water production from downstream collector wells. Using a numerical model, we investigate the impact of groundwater pumping and dam operation on the hydrodynamics in the aquifer and water production. We focus our study on two processes that potentially limit water production of an RBF system: the development of an unsaturated zone and riverbed clogging. We quantify river clogging by calibrating a time-dependent riverbed permeability function based on knowledge of pumping rate, river stage, and temperature. The dynamics of the estimated riverbed permeability reflects clogging and scouring mechanisms. Our results indicate that (1) riverbed permeability is the dominant factor affecting infiltration needed for sustainable RBF production; (2) dam operation can influence pumping efficiency and prevent the development of an unsaturated zone beneath the riverbed only under conditions of sufficient riverbed permeability; (3) slow river velocity, caused by dam raising during summer months, may lead to sedimentation and deposition of fine-grained material within the riverbed, which may clog the riverbed, limiting recharge to the collector wells and contributing to the development of an unsaturated zone beneath the riverbed; and (4) higher river flow velocities, caused by dam lowering during winter storms, scour the riverbed an thus increase its permeability. These insights can be used as the basis for developing sustainable water management of a RBF system. 2

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WinGridder - An interactive grid generator for TOUGH - A user's manual (Version 1.0)

Cited by 7 publications

References 4 publications

Estimating Large‐Scale Fracture Permeability of Unsaturated Rock Using Barometric Pressure Data

Estimating Large‐Scale Fracture Permeability of Unsaturated Rock Using Barometric Pressure Data

Numerical Investigation of the Influences of Wellbore Flow on Compressed Air Energy Storage in Aquifers

Factors Governing Sustainable Groundwater Pumping near a River

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