Two-scale modeling of transport processes in heterogeneous materials

2009 ◽  
pp. 255-261
Author(s):  
Jan S_kora
Keyword(s):  
Heterogeneous Materials ◽  
Transport Processes ◽  
Scale Modeling

scholarly journals Acceleration of uncertainty updating in the description of transport processes in heterogeneous materials

2012 ◽  
Vol 236 (18) ◽  
pp. 4862-4872 ◽  
Author(s):  
Anna Kučerová ◽  
Jan Sýkora ◽  
Bojana Rosić ◽  
Hermann G. Matthies
Keyword(s):  
Heterogeneous Materials ◽  
Transport Processes

scholarly journals Automated Distinction between Cement Paste and Aggregates of Concrete Using Laser-Induced Breakdown Spectroscopy

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4624
Author(s):  
Pakdad Pourbozorgi Langroudi ◽  
Gesa Kapteina ◽  
Marcus Illguth
Keyword(s):  
Cement Paste ◽  
Heterogeneous Materials ◽  
Transport Processes ◽  
Laser Induced Breakdown Spectroscopy ◽  
Hardened Cement ◽  
Limit Values ◽  
Breakdown Spectroscopy ◽  
Distribution Of Elements ◽  
Laser Induced Breakdown ◽  
To Receive

Laser-induced breakdown spectroscopy (LIBS) is a technique which enables the analysis of material components with precision and spatial resolution. Furthermore, the investigation method is comparatively fast which enables illustrating the distribution of elements within the examined material. This opens new possibilities for the investigation of very heterogeneous materials, such as concrete. Concrete consists of cement, water, and aggregates. As most of the transport processes take place exclusively in the hardened cement paste, relevant limit values linked to harmful element contents are specified in relation to the cement mass. When a concrete sample from an existing structure is examined, information on the concrete composition is usually not available. Therefore, assumptions have to be made to convert the element content analyzed in the sample based on the cement content in the sample. This inevitably leads to inaccuracies. Therefore, a method for distinction between cement paste and aggregates is required. Cement and aggregate components are chemically very close to each other and therefore, complex for classification. This is why the consideration of a single distinguishing feature is not sufficient. In this paper, a machine learning method is described and has been used to automate the distinction of the cement paste and aggregates of the LIBS data to receive reliable information of this technique. The presented approach could potentially be employed for many heterogeneous materials with the same complexity to quantify the arbitrary substances.

scholarly journals Toward Multi-scale Modeling and simulation of conduction in heterogeneous materials

2015 ◽  
Author(s):  
Jeremy B. Lechman ◽  
Corbett Chandler. Battaile ◽  
Dan Bolintineanu ◽  
Marcia A. Cooper ◽  
William W. Erikson ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Heterogeneous Materials ◽  
Multi Scale ◽  
Scale Modeling ◽  
Multi Scale Modeling

Research Overview of the Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (CARTHE)

2014 ◽  
Vol 2014 (1) ◽  
pp. 544-560 ◽  
Author(s):  
Tamay M. Özgökmen ◽  
Francisco J. Beron-Vera ◽  
Darek Bogucki ◽  
Shuyi S. Chen ◽  
Clint Dawson ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Selection Process ◽  
Model Performance ◽  
Transport Processes ◽  
Winter Storms ◽  
Natural Processes ◽  
Multi Scale ◽  
Scale Modeling ◽  
Research Initiative

ABSTRACT CARTHE (http://carthe.org/) is a Gulf of Mexico Research Initiative (GoMRI) consortium established through a competitive peer-reviewed selection process. CARTHE comprises 26 principal investigators from 14 universities and research institutions distributed across four Gulf of Mexico states and other four states. It fuses into one group investigators with unique scientific and technical knowledge and extensive publications related to oil fate/transport processes, oceanic and atmospheric turbulence, air-sea interactions, tropical cyclones and winter storms, and coastal and nearshore modeling and observations. Our primary goal is to accurately predict the fate of hydrocarbons released into the environment. Achieving this goal is particularly challenging since petroleum releases into the environment interact with natural processes across six orders of magnitude of time and space scales. We are developing a multi-scale modeling tool by incorporating state-of-the-art hydrophysical models, each applicable for a restricted range of scales, into a single, interconnected modeling system to predict the physical dispersal of hydrocarbons across scales ranging from the microscale at the wellhead to oceanic and atmospheric mesoscales. CARTHE is also conducting novel in-situ observations and laboratory experiments specifically designed for quantifying submesoscale dispersion as well as for both model validation and parameterization. Finally, we are providing a robust set of uncertainty metrics and analysis tools to assess model performance and quantify predictive uncertainty.

Multi-Scale Modeling of Heterogeneous Materials and the Validation Challenge

2011 ◽  
Vol 70 ◽  
pp. 345-350
Author(s):  
Chris Pearce ◽  
Lukasz Kaczmarczyk
Keyword(s):  
Multiple Scales ◽  
Heterogeneous Materials ◽  
Heterogeneous Material ◽  
Material Behavior ◽  
Scale Separation ◽  
Multi Scale ◽  
Scale Modeling ◽  
Modeling Techniques ◽  
Multi Scale Modeling ◽  
Scale Properties

This paper considers multi-scale modeling strategies for heterogeneous materials while also highlighting the problems of determining experimentally the micro-scale properties and validating such techniques. Multi-scale modeling techniques enable us to capture the influence of (evolving) heterogeneous material microstructures on the overall macroscopic behavior. This paper discusses computational multi-scale modeling techniques for problems both with and without poor scale separation. In developing these powerful multi-scale modeling techniques, the obvious challenge of validating both the material behavior at multiple scales and the associated scale transition methodologies, using advances in material characterization and experimental mechanics, comes into sharp focus and this will be briefly explored here.

Saturn's E, G and F rings: modulated by the plasma sheet

1984 ◽  
Vol 75 ◽  
pp. 597
Author(s):  
E. Grün ◽  
G.E. Morfill ◽  
T.V. Johnson ◽  
G.H. Schwehm
Keyword(s):  
Solar Wind ◽  
Direct Contact ◽  
Transport Processes ◽  
Time Variable ◽  
Dust Particles ◽  
Spatial Diffusion ◽  
Drag Forces ◽  
Orbit Perturbation ◽  
Time Variations ◽  
F Ring

ABSTRACTSaturn's broad E ring, the narrow G ring and the structured and apparently time variable F ring(s), contain many micron and sub-micron sized particles, which make up the “visible” component. These rings (or ring systems) are in direct contact with magnetospheric plasma. Fluctuations in the plasma density and/or mean energy, due to magnetospheric and solar wind processes, may induce stochastic charge variations on the dust particles, which in turn lead to an orbit perturbation and spatial diffusion. It is suggested that the extent of the E ring and the braided, kinky structure of certain portions of the F rings as well as possible time variations are a result of plasma induced electromagnetic perturbations and drag forces. The G ring, in this scenario, requires some form of shepherding and should be akin to the F ring in structure. Sputtering of micron-sized dust particles in the E ring by magnetospheric ions yields lifetimes of 102to 104years. This effect as well as the plasma induced transport processes require an active source for the E ring, probably Enceladus.

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