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See detailModelling of the convective drying of resorcinol-formaldehyde resins: influence of the drying conditions on the induces stress tensor
Léonard, Angélique ULg; Crine, Michel ULg; Jomaa, Wahbi

in Farkas, Istvan (Ed.) Drying 2006, the Proceedings of the 15th International Drying Symposium,Budapest, Hungary, 20-23 August 2006, Vol. A (2006, August)

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailModelling of the cooling of steel pieces
Habraken, Anne ULg; Bourdouxhe, M.

in Wrobel; Brebbia; Nowak (Eds.) Advanced Computational Method in Heat Transfer, Vol. 3 - Phase Change and Combustion simulation. Proceedings of the First International Conference (1990)

Detailed reference viewed: 7 (4 ULg)
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See detailModelling of the Excavation Damaged Zone in Opalinus Clay
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg

in Post-TIMODAZ International Workshop THM effects in clay host rocks for radioactive waste repositories (2012)

Detailed reference viewed: 17 (3 ULg)
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See detailModelling of the liquid distribution in a trickle flow packed column based upon X-ray tomography images
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Chemical Engineering Communications (1999), 175

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A ... [more ▼]

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A, Glitsch Benelux). The liquid holdup distribution is determined for liquid flowrates ranging from 1000 l/h to 6000 l/h, that correspond to superficial velocities ranging from 10(-3) to 6 10(-3) m/s, in several cross sections situated at different heights in the packed column. A characteristic length, corresponding to the smallest scale beyond which the packing properties may be supposed statistically homogenous and isotropic, as determined by Means of the autocorrelation function method applied to the images of the solid distribution. Both local and global liquid holdup measurements are satisfactorily modelled by means of a partial wetting model based on a probabilistic approach. [less ▲]

Detailed reference viewed: 24 (3 ULg)
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See detailModelling of the Marine Carbon Cycle
Munhoven, Guy ULg

Scientific conference (2012, October 17)

The lecture is subdivided into two parts. The first one deals with the essence of modelling, with the main principles and stages of development. The procedure of model development will be exemplified on ... [more ▼]

The lecture is subdivided into two parts. The first one deals with the essence of modelling, with the main principles and stages of development. The procedure of model development will be exemplified on the basis of a practical question. During this first part, a number of concepts and parameters that are important for the particular case of ocean carbon cycle modelling are already introduced. In the second part, we further deepen these. We explore the main physical and biogeochemical processes that are important to understand how the carbon cycle operates in the world ocean and provide insight into the way they are represented in different types of models currently used. [less ▲]

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See detailModelling of the micro-mechanical behaviour of steel sheets during deep-drawing
Duchene, Laurent ULg; Godinas, A.; Habraken, Anne ULg et al

in Duflou, J. R.; Geiger, M.; Kals, H. J. J. (Eds.) et al Proceedings of the 9th International Conference on Sheet Metal (2001)

This abstract presents a constitutive law based on Taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation ... [more ▼]

This abstract presents a constitutive law based on Taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method has been developed. This local yield locus model uses a discrete representation of the material's texture. The interpolation method is presented and a deep-drawing application is simulated in order to show up the influence of the texture evolution during forming processes. [less ▲]

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See detailModelling of the Nonlinear End-Systolic Pressure-Volume Relation and Volume-at-Zero-Pressure in Porcine Experiments
Davidson, Shaun M.; Kannangara, D. Oliver; Pretty, Christopher G. et al

Poster (2015, August)

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments ... [more ▼]

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments. However, ESPVR has been observed to behave in a curvilinear fashion when cardiac reflexes are not supressed, suggesting the curvilinear function may be more clinically appropriate. Data was gathered from 41 vena cava occlusion manoeuvres performed experimentally at a variety of PEEPs across 6 porcine specimens, and ESPVR determined for each pig. An exponential model of ESPVR was found to provide a higher correlation coefficient than a linear model in 6 out of 7 cases, and a lower Akaike Information Criterion (AIC) value in all cases. Further, the exponential ESPVR provided positive V0 values in a physiological range in6 out of 7 cases analysed, while the linear ESPVR produced positive V0 values in only 3 out of 7 cases, suggesting linear extrapolation of ESPVR to determine V0 may be flawed. [less ▲]

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See detailModelling of the Nonlinear End-Systolic Pressure-Volume Relation and Volume-at-Zero-Pressure in Porcine Experiments
Davidson, Shaun M.; Kannangara, D. Oliver; Pretty, Christopher G. et al

in Proceedings of the 37th International Conference of the IEEE Engineering in Medicine and Biology Society (2015, August)

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments ... [more ▼]

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments. However, ESPVR has been observed to behave in a curvilinear fashion when cardiac reflexes are not supressed, suggesting the curvilinear function may be more clinically appropriate. Data was gathered from 41 vena cava occlusion manoeuvres performed experimentally at a variety of PEEPs across 6 porcine specimens, and ESPVR determined for each pig. An exponential model of ESPVR was found to provide a higher correlation coefficient than a linear model in 6 out of 7 cases, and a lower Akaike Information Criterion (AIC) value in all cases. Further, the exponential ESPVR provided positive V0 values in a physiological range in6 out of 7 cases analysed, while the linear ESPVR produced positive V0 values in only 3 out of 7 cases, suggesting linear extrapolation of ESPVR to determine V0 may be flawed. [less ▲]

Detailed reference viewed: 22 (4 ULg)
Peer Reviewed
See detailModelling of the North-West African Upwelling
Elmoussaoui, Abdellali; Djenidi, Salim ULg; Kostianoy, Andrey

in Proceedings of the International Conference "Physical processes on the ocean shelf" (1996)

Detailed reference viewed: 8 (0 ULg)
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See detailModelling of the response of a slender structure to vortex shedding in the atmospheric boundary layer
Wertz, Freddy ULg

Master's dissertation (2015)

This work is about modelling vortex induced vibrations on a 100 m height generic reinforced concrete pylon with a square cross-section and a 20 height/width ratio, vibrating in its first across-wind ... [more ▼]

This work is about modelling vortex induced vibrations on a 100 m height generic reinforced concrete pylon with a square cross-section and a 20 height/width ratio, vibrating in its first across-wind bending mode at a frequency of 0.35 Hz for a critical wind speed of 14.6 m/s. An equivalent aeroelastic model made of a copper spline modelling the dynamic behaviour and a foam blocks skin modelling the external geometry and adjusting the mass is realized. Similitude laws are discussed based on their relevance in the simulation. The model is validated through experimental modal analysis and is tested in wind tunnel uniform and boundary layer winds. 3 turbulence levels and 4 incidence angles are tested. Measured amplitudes are small (around 5 cm in full scale). The influence of turbulence is qualitatively visible in experimental results. Analytical and numerical estimation procedures are also implemented and discussed: The Eurocode norm, a harmonic load model and the spectral model of Vickery and Clark. The Eurocode approach gives the most conservative estimations and is followed by estimations from the harmonic load model having the correlation length as parameter. The spectral model gives estimations of the order of magnitude of experimental measurements in the wind tunnel for a spectral bandwidth of 0.2 and a correlation length comprised between 1 and 3 times the width of the cross-section. [less ▲]

Detailed reference viewed: 114 (34 ULg)
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See detailModelling of the squeeze film air damping in MEMS
Barroso, Juan José Gómez; Bruls, Olivier ULg; Berli, Claudio et al

in Proceedings of the ENIEF Conference (2009)

We propose a formulation for modeling the squeeze film air damping in micro-plates typical of micro-electromechanical devices for micro switch applications. A special finite element is developed, in which ... [more ▼]

We propose a formulation for modeling the squeeze film air damping in micro-plates typical of micro-electromechanical devices for micro switch applications. A special finite element is developed, in which the nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard linear elastic model is used for the displacement field. The formulation is based on a finite element discretization of both the pressure and displacement fields. The coupled equations of motion are established and, for harmonic oscillations, we show that the resulting damping matrix depends on the frequency. The typical dimensions and properties of the MEMS device are in the order of hundred micrometers length and some micrometers (3-8 micrometers) thick, with a separation from the substrate of also some micrometers (e.g. 3-5 micrometers). For these dimensions, the influence of damping owing to the surrounding air cannot be neglected, having an important contribution to the quality factor of the device. The influence of plate holes, which are necessary because of the fabrication process, determines also the dynamic behavior of the plate. Examples are presented, with comparisons to results of the bibliography. [less ▲]

Detailed reference viewed: 113 (4 ULg)
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See detailModelling of the squeeze film air damping in MEMS
Bruls, Olivier ULg

Report (2008)

This document proposes a formulation of the squeeze film air damping in micro-plates. The nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard ... [more ▼]

This document proposes a formulation of the squeeze film air damping in micro-plates. The nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard linear elastic model is used for the displacement field. The formulation is based on a finite element discretization of both the pressure and displacement fields. The coupled equations of motion are established and, for harmonic oscillations, we show that the resulting damping matrix depends on the frequency. [less ▲]

Detailed reference viewed: 43 (5 ULg)
Peer Reviewed
See detailModelling of the underground coal gasification process at Thulin on the basis of thermodynamical equilibria and isotopic measurements
Dufaux, Anne; Gaveau, Bénédicte; Létolle, René et al

in Fuel (1990), 69

Detailed reference viewed: 43 (1 ULg)
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See detailModelling of the Unsaturated Flow in Porous Media; Handling of the 3D Behaviour with uncoupled 1DV/2DH Richards Equations
Paulus, Raphaël ULg; Dewals, Benjamin ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 5th International Confrence on Advanced Computational Methods in Engineering (2011, November)

Detailed reference viewed: 36 (10 ULg)
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See detailModelling of the wave propagation, the coastal currents and the induced topographic changes
Fraikin, Catherine; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 9th International Symposium on River Sedimentation (2004)

This paper models the sea bottom evolution. This model is built up on three main parts. The first one describes the wave propagation, taking simultaneously into account the refraction, the diffraction and ... [more ▼]

This paper models the sea bottom evolution. This model is built up on three main parts. The first one describes the wave propagation, taking simultaneously into account the refraction, the diffraction and the reflection but also the energy dissipation caused by wave breaking. This model is solved by the numerical method of the finite volumes, using an iterative resolution (the GMRES method). Several validations of this model have been carried out on many examples such as harbors of various geometries and depths, beaches,… The wave induced currents are computed in the second part based on the concept of the radiation stresses describing the excess of the flux momentum caused by the waves. A model based on the complete Navier-Stokes equations integrated on the depth and associated with appropriated forcing and friction terms is used. This model is computed as an update of WOLF software (HACH, ULg) and is applied to some examples such as beaches with or without coastal structures. Finally, the third part is about the sediment transport. It exhibits the topographic modifications of the coastal sea bottom caused by the waves and their currents. A loop execution of these three models ends this work. It gives us an operational tool to describe the topographic evolution of the coastal areas caused by the incident waves, the induced currents and then the resulting sediment transport, fulfilling the objectives of this paper. [less ▲]

Detailed reference viewed: 77 (1 ULg)