Simulation of radial journal bearings using the FSI approach and a multi-phase model with integrated cavitation

2014 ◽  
Vol 14 (1) ◽  
pp. 14 ◽  
Author(s):  
M. Geller ◽  
C. Schemmann ◽  
N. Kluck
Keyword(s):  
Journal Bearings ◽  
Phase Model ◽  
Multi Phase

Rubble Fire Multi-Phase Model Development.

2017 ◽  
Author(s):  
Heeseok Koo ◽  
Alexander Brown ◽  
Tyler Voskuilen ◽  
Flint Pierce
Keyword(s):  
Model Development ◽  
Phase Model ◽  
Multi Phase

A Multi-scale and Multi-phase Model for the Description of Toxicity caused by Paracetamol in Biological Tissue using the Example of the Human Liver

PAMM ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 199-200
Author(s):  
Lena Lambers ◽  
Navina Waschinsky ◽  
Daniel Werner ◽  
Tim Ricken
Keyword(s):  
Biological Tissue ◽  
Human Liver ◽  
Phase Model ◽  
Multi Scale ◽  
Multi Phase

Multi-phase model of a sparse ion-exchange spacer

2004 ◽  
Vol 239 (1) ◽  
pp. 3-8 ◽  
Author(s):  
I Rubinstein ◽  
Y Oren ◽  
B Zaltzman
Keyword(s):  
Ion Exchange ◽  
Phase Model ◽  
Multi Phase

Diffusion of Multi-Ionic Species in Recycled Aggregate Concrete

2011 ◽  
Vol 477 ◽  
pp. 56-64 ◽  
Author(s):  
Nattapong Damrongwiriyanupap ◽  
Yu Chang Liang ◽  
Yun Ping Xi
Keyword(s):  
Diffusion Coefficient ◽  
Cement Paste ◽  
Recycled Aggregate Concrete ◽  
Phase Model ◽  
Recycled Aggregate ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Aggregate Concrete ◽  
Multi Scale ◽  
Multi Phase

In recent years, recycled aggregate concrete has been used in reinforced concrete structures. Concrete structures exposed to chloride environment often encountera premature deterioration due to corrosion of steel reinforcement. In order to avoid unplanned maintenances or repairs, it is necessary to develop a reliable prediction model for the chloride diffusion in concrete. The basic formulation of the transport theory will be presented first and then its application to Recycled Aggregate Concrete (RAC) will follow. Chloride diffusion in RAC is different from the diffusion in regular concrete, because the material parameters of RAC such as chloride diffusion coefficient are different from those of regular concrete. In this paper, a multi-scale and multi-phase model will be developed to characterize theinternal structure of the recycled aggregate with a layer of residual cement paste on the surface of natural aggregate and another layer of surface treatment material on the surface of the residual cement paste. The multi-scale and multi-phase model will also be used to characterize the chloride diffusion coefficient of RAC. The numerical analysis of the diffusion equations is performed by using finite element method.

Numerical simulation of rock acoustics with a multi‐phase model

2007 ◽  
Vol 121 (5) ◽  
pp. 3124-3124
Author(s):  
Limin Song ◽  
Yang Zhang ◽  
Max Deffenbaugh
Keyword(s):  
Numerical Simulation ◽  
Phase Model ◽  
Multi Phase

scholarly journals Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models

2019 ◽  
Vol 622 ◽  
pp. A185 ◽  
Author(s):  
Yao Wang ◽  
Qiang Chang ◽  
Hongchi Wang
Keyword(s):  
Finite Size ◽  
Carbon Chain ◽  
Phase Model ◽  
Finite Size Effect ◽  
Volatile Species ◽  
Two Phase ◽  
Chemical Models ◽  
Species Abundances ◽  
Phase Models ◽  
Multi Phase

Context. Abundant carbon-chain species have been observed towards lukewarm corinos L1527, B228, and L483. These carbon-chain species are believed to be synthesized in the gas phase after CH4 desorbs from the dust grain surface at the temperature around 30 K. Aims. We investigate carbon-chain species formation in lukewarm corinos using a more rigorous numerical method and advanced surface chemical models. We also pay attention to the significance of the finite size effect. Methods. We used the macroscopic Monte Carlo method in our simulations. In addition to the two-phase model, the basic multi-phase model and the new multi-phase models were used for modelling surface chemistry on dust grains. All volatile species can sublime at their sublimation temperatures in the two-phase model while most volatile species are frozen in the ice mantle before water ice sublimes in the basic and the new multi-phase models. The new multi-phase models allow more volatile species to sublime at their sublimation temperatures than the basic multi-phase model does. Results. The significance of the finite size effect is dependent on the duration of the cold phase. The discrepancies between the rate equation approach and the Monte Carlo method decrease as the duration of the cold phase increases. When T ~ 30 K, the abundances of gaseous CH4 and CO in the two-phase model are the highest while the basic multi-phase model predicts the lowest CO and CH4 abundances among all models. The abundances of carbon-chain species in the basic and the new multi-phase models are lower than that in the two-phase model when T ~ 30 K because CH4 is crucial for the synthesis of carbon-chain species. However, because the abundance of electrons increases as the abundance of H3O+ decreases, some carbon-chain species abundances predicted by the basic multi-phase model may not be lower than that in the new multi-phase models. The two-phase model performs best in predicting carbon-chain species abundances to fit observations while the basic multi-phase model works the worst. The abundances of carbon-chain species predicted by the new multi-phase models agree reasonably well with observations. Conclusions. The amount of CH4 can diffuse inside the ice mantle, thus sublime upon warm-up plays a crucial role in the synthesis of carbon-chain species in the gas phase. The carbon-chain species observed in lukewarm corinos may be able to gauge surface chemical models.

scholarly journals Estimation of future methane production from Hellenic landfills

2013 ◽  
Vol 11 (2) ◽  
pp. 162-171
Keyword(s):  
Methane Production ◽  
Energy Production ◽  
Phase Model ◽  
Methane Generation ◽  
Sanitary Landfills ◽  
Multi Phase ◽  
The Impact ◽  
The Eu

The main objective of this research was to predict expected methane generation in Hellenic sanitary landfills, in order to evaluate its potential for energy production and to ensure health and safety in and around these sites on the long term. The study was performed for the period 2008 – 2028 with the use of a multi-phase model and included also a sensitivity analysis in order to determine the impact of certain waste parameters. In this context, two ‘extreme’ reference scenarios were formulated and assessed, one anticipating fulfilment of the EU landfill directive (which sets limits to the amount of biodegradable and packaging materials to be deposited in sanitary landfills) whereas a second (do-nothing scenario) assuming no such timely compliance.

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