scholarly journals Numerical Modelling of the PVF2Volume Strain with Carbon Dioxide

2006 ◽  
Vol 61 (6) ◽  
pp. 751-757 ◽  
Author(s):  
C. Baudet ◽  
J. C. Grandidier ◽  
L. Cangémi ◽  
M. H. Klopffer
Keyword(s):  
Carbon Dioxide ◽  
Numerical Modelling

MUFITS: A Universal Reservoir Simulator for Numerical Modelling, History Matching and Optimization of Multicomponent Flows in Porous Media

2020 ◽  
Author(s):  
Andrey Afanasyev ◽  
Elena Vedeneeva ◽  
Natalia Gorokhova
Keyword(s):  
Carbon Dioxide ◽  
Porous Media ◽  
Numerical Modelling ◽  
History Matching ◽  
External Control ◽  
Flows In Porous Media ◽  
Reservoir Simulations ◽  
Multicomponent Flows ◽  
Wide Range ◽  
Reservoir Simulator

<p>The recent development of the academic reservoir simulator MUFITS aims its transformation to a universal software package that allows for (a) numerical modelling of non-isothermal multicomponent flows in porous media under wide range of pressures and temperatures, including under critical thermodynamic conditions, (b) history matching of non-isothermal reservoir models, and (c) optimization of thermohydrodynamic processes in porous media.</p><p>The extended simulator capabilities for modelling of multicomponent flows includes a new fluid properties module for compositional and thermal reservoir simulations using different cubic equations of state (e.g. Peng-Robinson EoS). An extended library of hydrocarbons, carbon dioxide, nitrogen, water, and other components is built into the simulator, and additional components can be characterized and loaded into the library. An arbitrary number of components can be used in particular simulation. In order to simplify the module usage, the corresponding input data are made compatible with the petroleum industry standards. Unlike many other codes, MUFITS allows for compositional modelling of non-isothermal flows of fluids which properties are predicted with a cubic EoS.</p><p>For improved history matching and optimization the simulator is supplied with an external Simulation Control Unit (SCU), which automatically changes certain parameters of the digital reservoir model and reads back the results of the simulations. An external control loop is implemented in SCU. At each iteration of the loop non-isothermal flow in a porous medium is simulated, and the simulation results are used for calculation of the objective function being minimized. In order to accelerate the history matching and optimization, the SCU can simultaneously (in parallel) run several reservoir simulations. The simulator is supplied with the build-in capabilities for the calculation of gravity changes and surface uplift/subsidence which measurements can also be automatically used in history matching.</p><p>We complement the new developments with several application examples related to gas condensate fields exploration, carbon dioxide injection in depleted oil reservoirs and gas storages, and natural flows in deep geothermal systems.</p><p>We acknowledge the funding from Russian Science Foundation under grant # 19-71-10051.</p>

Numerical modelling of changes of pressure inside the protected room during fighting the fire using carbon dioxide

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sylwia Boroń
Keyword(s):  
Carbon Dioxide ◽  
Numerical Modelling ◽  
Relative Error ◽  
Test Chamber ◽  
Gas Discharge ◽  
Experimental Measurements ◽  
Cfd Simulations ◽  
New Approach ◽  
Content Type ◽  
Pressure Changes

Purpose This paper aims to study and assess a new approach for prediction of changes of pressure during gas discharge inside the room protected by fixed gaseous extinguishing system by computational fluid dynamics (CFD) simulations. Design/methodology/approach The research program consisted of two stages. The first stage was dedicated to the experimental measurements of pressure changes during extinguishing gas discharge into the test chamber in a real scale (70 m3), for two relief openings that differ in their area. The next step was about performing CFD simulations forecasting pressure changes during gas discharge into the numerically represented test chamber. Estimation of the correctness and usefulness of the CFD model was based on a comparison of the CFD results with standard calculations and experimental measurements. Findings Numerical modelling of pressure changes during the carbon dioxide discharge was very close to the experiment. The obtained results had sufficient accuracy (in most cases relative error <15%), while the standard approach predicted pressure changes with an average relative error over 36% and did not estimate the decrease of pressure at all. Originality/value Conducted research confirms the viability of the new approach in modelling the pressure changes and indicates additional benefits of the numerical analyses in the determination of the fire safety of protected premises.

scholarly journals Numerical modelling of combustion in SI engine fuelled with methane

2009 ◽  
Vol 139 (4) ◽  
pp. 45-54
Author(s):  
Arkadiusz KOCISZEWSKI
Keyword(s):  
Nitric Oxide ◽  
Carbon Dioxide ◽  
Numerical Analysis ◽  
Numerical Modelling ◽  
Si Engine ◽  
Exhaust Gases ◽  
Spark Plug ◽  
Paper Work ◽  
Lean Mixtures ◽  
Excess Number

Results of numerical analysis of methane and gasoline combustion in multipoint ignition SI engine are presented in the paper. Work parameters of engine fuelled with methane lean mixtures of λ = 1.45 and 1.8 for three configurations of spark plugs (one, two and four active spark plugs) are compared. These configurations were chosen taking into consideration earlier research concerning numerical modelling and experiments. The results of carried out analysis proved that using two spark plugs at air excess number λ = 1.8 caused that engine work parameters are similar to case of mixtures of λ = 1.45 with one spark plug configuration. Simultaneously, the emission of nitric oxide was decreased more than eight times and the concentration of carbon dioxide in exhaust gases was 20% lower.

Electron Cytochemical Study of Carbon Dioxide Laser Effect on Rhesus Monkey Cornea

1974 ◽  
Vol 32 ◽  
pp. 224-225
Author(s):  
K. C. Tsou ◽  
J. Morris ◽  
P. Shawaluk ◽  
B. Stuck ◽  
E. Beatrice
Keyword(s):  
Carbon Dioxide ◽  
Electron Microscope ◽  
Rhesus Monkey ◽  
Carbon Dioxide Laser ◽  
Cytochemical Study ◽  
Laser Effect

While much is known regarding the effect of lasers on the retina, little study has been done on the effect of lasers on cornea, because of the limitation of the size of the material. Using a combination of electron microscope and several newly developed cytochemical methods, the effect of laser can now be studied on eye for the purpose of correlating functional and morphological damage. The present paper illustrates such study with CO2 laser on Rhesus monkey.

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

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