Effect of outer boundary condition, reservoir size, and CO2effective permeability on pressure and CO2saturation predictions under carbon sequestration conditions

2016 ◽  
Vol 6 (4) ◽  
pp. 546-560 ◽  
Author(s):  
Liwei Zhang ◽  
Robert M. Dilmore ◽  
Grant S. Bromhal
Keyword(s):  
Boundary Condition ◽  
Carbon Sequestration ◽  
Outer Boundary

The Role of the Outer Boundary Condition in Accretion Disk Models: Theory and Application

2000 ◽  
Vol 537 (1) ◽  
pp. 236-244 ◽  
Author(s):  
Feng Yuan ◽  
Qiuhe Peng ◽  
Ju‐fu Lu ◽  
Jianmin Wang
Keyword(s):  
Boundary Condition ◽  
Accretion Disk ◽  
Outer Boundary

Boundary Conditions for the Turbulent Mixing Layer Between Two Parallel Streams

1974 ◽  
Vol 41 (1) ◽  
pp. 25-28 ◽  
Author(s):  
T. E. Unny ◽  
Norio Hayakawa
Keyword(s):  
Boundary Layer ◽  
Boundary Condition ◽  
Boundary Conditions ◽  
Eddy Viscosity ◽  
Outer Boundary ◽  
Mixing Layer ◽  
Turbulent Mixing Layer ◽  
Boundary Layer Problem ◽  
Finite Distance ◽  
Layer Problem

The boundary conditions of the boundary-layer problem between two parallel turbulent streams are investigated solving higher-order terms of the inner and outer boundary-layer expansion. It is shown that the assumption that the eddy viscosity is proportional to longitudinal distance x fails to yield the third boundary condition of the boundary-layer problem. In this paper this boundary condition has been derived based on the consideration that the eddy viscosity attains a constant value at large but finite distance. The result applies to compressible as well as incompressible flow.

Simulating the Effects of Lower-Energy (<30 keV) Electrons on the Inner Magnetosphere Satellite Surface Charging Environment

2021 ◽  
Author(s):  
Yiqun Yu ◽  
Shengjun Su ◽  
Jinbin Cao ◽  
Michael Denton ◽  
Vania Jordanova
Keyword(s):  
Boundary Condition ◽  
Ring Current ◽  
Electron Flux ◽  
Current Model ◽  
Outer Boundary ◽  
Maxwellian Distribution ◽  
Flux Boundary Condition ◽  
Inner Magnetosphere ◽  
Surface Charging ◽  
Flux Spectrum

&lt;p&gt;Satellite surface charging often occurs in the inner magnetosphere from the pre-midnight to the dawn sector when electron fluxes of&amp;#160; hundreds of eV to tens of keV are largely enhanced. Inner magnetosphere ring current models can be used to simulate/predict the satellite surface charging environment, with their flux outer boundary conditions specified either based on observations or provided by other models, such as MHD models. In the latter approach, the flux spectrum at the outer boundary is usually assumed to follow a Kappa or Maxwellian distribution, which however often departs greatly from, or underestimates, the realistic distribution below tens of keV, the energy range that is crucial in the spacecraft surface charging anomaly. This study aims to optimize the electron flux boundary condition of the inner magnetosphere ring current model to achieve a better representation of the surface charging environment. The MHD-parameterized flux spectrum is combined with an empirical electron flux model that specifies the &lt; 40 keV electron flux spectrum. New simulation results indicate that the surface charging environment, monitored by an integrated electron flux between 10&lt;E&lt;50 keV, is significantly enhanced by 1-2 orders of magnitude as opposed to the case in which Kappa/Maxwellian distribution is used at the outer boundary. The new results therefore show better agreement with Van Allen Probes measurements. The improved boundary condition also impacts the auroral precipitation, which may change the conductivity and circulated dynamics.&amp;#160;&lt;/p&gt;

Modelling the Rebuilding the Radiation Belt Following a Drop-out Event from Acceleration of the Seed Population

2020 ◽  
Author(s):  
Hayley Allison ◽  
Yuri Shprits ◽  
Sarah Glauert ◽  
Richard Horne ◽  
Dedong Wang
Keyword(s):  
Boundary Condition ◽  
Radiation Belt ◽  
Electron Flux ◽  
Outer Boundary ◽  
Dynamic Environment ◽  
Drop Out ◽  
Sequence Of Events ◽  
Seed Population ◽  
Van Allen Probes ◽  
Open Question

&lt;p&gt;&lt;span&gt;The Earth&amp;#8217;s electron radiation belts are a dynamic environment and can change dramatically on short timescales. From Van Allen Probes observations, we see storm time drop-out events followed by a rapid recovery of the electron flux over a broad range of energies. Substorms can supply a seed population of new electrons to the radiation belt region, which are then energised by a number of processes, rebuilding the belts. &lt;/span&gt;However, how the electron flux is replenished across energy space, and the sequence of events leading to flux enhancements, remains an open question. Here we use a 3-D radiation belt model to explore how the seed population is accelerated to 1 MeV on realistic timescales, comparing the output to Van Allen Probes observations. By using a low energy boundary condition derived by POES data we encompass the whole radiation belt region, employing an open outer boundary condition. This approach isolates the contribution of seed population changes and allows electron flux variations over a broad range of L* to be studied. Using the model, we explore the contribution of both local acceleration and radial diffusion and demonstrate that the timing and duration of these two processes, particularly in relation to one another, is important to determine how the radiation belt rebuilds.&lt;/p&gt;

A Perfectly Transparent Spectral Shell for Unsteady Wave-Body Interactions

2002 ◽  
Author(s):  
J. Andrew Hamilton ◽  
Ronald W. Yeung
Keyword(s):  
Boundary Condition ◽  
Solution Method ◽  
Outer Boundary ◽  
Outer Region ◽  
Interior Solution ◽  
Function Solution ◽  
Solution Methods ◽  
Matching Procedure ◽  
Surface Green Function ◽  
Unsteady Problems

A general outer boundary condition for time-dependent wave-body interaction problems is developed. The technique is based on domain decomposition and the unsteady free-surface Green function solution of the flow in an outer region. The boundary condition results in a shell condition which may be applied to a variety of interior solution methods. When the interior solution method is a boundaryintegral method, an implicit matching can be done. When a volume-discretization method is used in the interior region, a newly developed explicit matching procedure is performed. Demonstrations of the transparent properties of this shell are made for several unsteady problems.

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