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See detailNumerical simulation of DP steel damage using a physically-based GTN model
Fansi, Joseph; Habraken, Anne ULg; Balan, Tudor et al

Poster (2012)

Poster describing the identification and use of Gurson model on DP Steel

Detailed reference viewed: 32 (17 ULg)
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See detailNumerical simulation of drying under variable external conditions: application to solar drying of seedless grapes
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Journal of Food Engineering (2006), 76(2), 179-187

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See detailNumerical simulation of elastoviscoplastic large strains of metals at high temperature.
Cescotto, Serge ULg; Charlier, Robert ULg

in Proc. 8th Conf. on SMIRT (1985, August)

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See detailNumerical simulation of finite strain viscoplastic problems
Garcia-Garino, Carlos; Andia fages, Susana; Mirasso, Anibal et al

in International Journal of Computational & Applied Mathematics (2013), 246

A large strain elastoplastic constitutive model based on hyperelasticity and multiplicative decomposition of deformation gradient tensor is extended to viscous case, in a framework similar to the one that ... [more ▼]

A large strain elastoplastic constitutive model based on hyperelasticity and multiplicative decomposition of deformation gradient tensor is extended to viscous case, in a framework similar to the one that has been proposed by Ponthot in an hypoelastic context. In this way a very useful framework can be obtained, able to deal with both rate dependent and rate independent problems. In this work a review of theoretical details and numerical implementation of the model are discussed. Similarly to what is done in rate independent plasticity, a Newton–Raphson scheme has been used to solve the non linear consistency condition in order to compute the viscoplastic multiplier. A plane strain plate with a central circular hole under tension is simulated in order to test the proposed model. Large deformation effects are considered in all the simulations carried out. Different parameters of the constitutive model are varied in order to study the sensitivity of the proposed algorithm. [less ▲]

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See detailNumerical simulation of heat transfer associated with low enthalpy geothermal pumping in an alluvial aquifer
Fossoul, Frédérique ULg; Orban, Philippe ULg; Dassargues, Alain ULg

in Geologica Belgica (2011), 14(1-2),

In a context favourable to renewable energies, various aquifers are studied to supply heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the ... [more ▼]

In a context favourable to renewable energies, various aquifers are studied to supply heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the river Meuse in providing an integrated tool for assessing the feasibility of a low energy air cooling/heating system for a large office building by pumping groundwater and discharging it in the river after being heated/cooled by using heat pumps. First, a comparative sensitivity analysis is performed using different codes for assessing the influence of coupling and non linearities on the main parameters due to the temperature evolution in function of time. Then, assuming that the aquifer temperature variation is weak enough to neglect its influence on hydrodynamics and thermal parameters, the MT3DMS and HydroGeoSphere codes are used for modelling the actual case-study. In practice, the worst case scenario considered by the project manager is the cooling of the office building during the hottest summer conditions. So, the influence of the warm water from the river Meuse is computed as it constitutes the major limiting factor. An optimisation of the pumping schema is computed to maximise the efficiency of the system. [less ▲]

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See detailNumerical simulation of heat transport associated with groundwater pumping in an alluvial aquifer
Fossoul, Frédérique ULg; Orban, Philippe ULg; Dassargues, Alain ULg

Conference (2009, September)

In a context more favourable to renewable energies, various aquifers are studied to feed heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the ... [more ▼]

In a context more favourable to renewable energies, various aquifers are studied to feed heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the river Meuse in order to provide an integrated tool for assessing the feasibility of a low energy air cooling /heating system for a large office building by pumping groundwater and discharging in the river. First, a comparative sensitivity analysis is performed using three different codes (MT3D, SHEMAT and HYDROGEOSHERE) for assessing the influence of coupling and non linearities in the main parameters due to the temperature evolution in function of time. Then, assuming that the variations of the aquifer temperature are weak enough to neglect their influence on hydrodynamics and thermal parameters, the MT3D and HYDROGEOSPHERE codes are used for modelling the actual case-study. In practice, for cooling the office building with groundwater initially at 13°C, the main influence of the relative hot water from the river Meuse (in hot summer conditions 27°C) is computed and constitutes the major limiting factor. An optimisation of the pumping schema is computed to maximise the efficiency of the cooling/heating system. [less ▲]

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See detailNumerical Simulation of High Drag Reduction Regime in Polymer Solutions
Dubief, Yves; White, Christopher M.; Terrapon, Vincent ULg et al

in Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference; No FEDSM2003-45652 (2003, July)

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper ... [more ▼]

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper discusses the problem of advection embedded in the FENE-P equation and the issue of the domain size. Finally we present results of simulations for High Drag Reduction regime, and show the subsequent modification of the vortical structures. [less ▲]

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See detailNumerical Simulation of Hot Isostatic Pressing of Metal Powder: Influence of Constitutive Equations
Argento, C.; Bouvard, D.; Stutz, P. et al

in Acte du Powder Metallurgy World Congress (1994, June)

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See detailNumerical simulation of impedance and admittance of OLEDs
Nguyen, Ngoc Duy ULg; Schmeits, Marcel

in Physica Status Solidi : A. Applications and Materials Science (2006), 203

The electrical characteristics of organic light-emitting devices are calculated for the dc and ac regimes by numerically solving the basic semiconductor equations under steady-state and small-signal ... [more ▼]

The electrical characteristics of organic light-emitting devices are calculated for the dc and ac regimes by numerically solving the basic semiconductor equations under steady-state and small-signal conditions. For a given structure, the dc and ac electric potential and electric field, the electron and hole concentrations, as well as the different components of the current density are obtained as function of the one-dimensional spatial coordinate. This approach allows a detailed microscopic description of the dependencies of these quantities on the applied steady-state voltage V0 and the frequency of the modulating voltage. The final output consists in the frequency-dependent complex admittance and impedance of the device, the real and imaginary parts of which are the experimentally-available data. As a typical example, we show the results for a two-layer structure where α-NPD is the hole-transporting material and Alq3 the electron-transporting material. The anode is made of ITO and Al/LiF composes the cathode. The admittance and impedance curves, yielded by the numerical simulation as functions of the modulation frequency, are fitted by an equivalent electrical circuit, the elements of which are resistances and capacitances. The number of com- ponents depends on the structure composition and on the applied steady-state voltage. We show that each element can be associated with a particular region of the device. This allows to correlate the dependence of each feature of the admittance and impedance curves with one or several parameters describing the ma- terial system. Such an analysis can be useful for the inverse approach, where, starting from measurements of the electrical ac characteristics, the aim is to get information on the microscopic mechanisms which contribute to the electrical conduction of the device. [less ▲]

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See detailNumerical simulation of large strain rate dependent J2 problems
GARCIA GARINO, A.; Ponthot, Jean-Philippe ULg; MIRASSO, A. et al

in Proceedings of ENIEF 2006, Mecanica Computational (2006, November)

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See detailNumerical Simulation of Lubricated Contact between Solids in Metal Forming Processes using the Arbitrary Lagrangian Eulerian Formulation
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Simulation of Material Processing: Theory, Methods and Application: Proceedings of the 7th International Conference NUMIFORM 2001 (2001, June)

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See detailNumerical Simulation of Lubricated Contact in Rolling Processes
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Journal of Materials Processing Technology (2002), 125-126

In this paper, the lubrication problem in numerical simulation of rolling process is presented. In this case, the recent and complex model of Marsault for the solution of the mixed lubrication regime has ... [more ▼]

In this paper, the lubrication problem in numerical simulation of rolling process is presented. In this case, the recent and complex model of Marsault for the solution of the mixed lubrication regime has been implemented and tested. This model requires the use of the finite difference method to work properly. We will discuss the advantages and the difficulties encountered when trying to solve the same problem with the finite element method in a general frame. Finally, a finite element formulation for the solution of the time-dependent Reynolds' equation coupled with the deformation of the workpiece is proposed. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailNumerical simulation of materials submitted to high strain rates. A thermomechanical coupled approach
Jeunechamps, Pierre-Paul ULg; Ponthot, Jean-Philippe ULg

in Int. Conf. on Computational Methods for Coupled Problems in Science and Engineering, COUPLED PROBLEMS 2007 (2007)

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See detailNumerical simulation of metal forming processes.
Grober, Henri; Cescotto, Serge ULg; Charlier, Robert ULg et al

in Proc. Int. Conf. on Nonlinear Mechanics (1985, October)

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See detailNumerical simulation of NO formation in cement rotary kiln
Wang, Shijie; Lu, Jidong; Li, Weijie et al

in Journal of Chemical Industry and Engineering(China) (2006), 57(11), 2631-2637

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See detailNumerical simulation of non lethal projectiles on human thorax
Nsiampa Ndompetelo, ULg; Robbe, Cyril ULg; Papy, Alexandre

in Ballistics 2011: 26th International Symposium (2011, September 11)

These last decades have seen the development of a new type of weapons, the non lethal weapons. Unlike the conventional weapons which may cause severe or fatal injuries and whose injury mechanisms are well ... [more ▼]

These last decades have seen the development of a new type of weapons, the non lethal weapons. Unlike the conventional weapons which may cause severe or fatal injuries and whose injury mechanisms are well documented, the non lethal weapons are designed for temporary incapacitation with reversible consequences or minor damage to the human body. They try therefore to fill the gap wherever the use of excessive forces or conventional weapons is not necessary. There are various non lethal technologies but here we will focus on non lethal kinetic energy weapons (NLKEW). The non penetrating characteristics of non lethal projectiles lead to different injury mechanisms to those related to conventional lethal projectiles. In order to better understand these effects and assess the injury severity, experiments are carried out on Post Mortem Human Surrogates (PMHS), animals and mechanical anthropomorphic systems. Nevertheless nowadays with the development of high performance computing systems, numerical simulations based on finite element method are increasingly used because of their cost-effectiveness, their predictive capabilities and their adaptability (for example the possibility of adapting the geometry to take into account various morphologies, …). Physical injury is a consequence of the interaction between the human body and the projectile. To assess the severity of injury, injury criteria are defined. The most used criterion on the assessment of the thorax injury is the maximum viscous criterion. Because of the human body complexity, reliable information on injury mechanisms and tolerance level to the impact of non lethal projectiles is limited. The major challenge in the numerical simulations is the human tissue material model as human tissue responses to impacts are various and complex. As a consequence, models which are biofidelic to the human living tissues are a key issue. To investigate and predict the human thorax response to the impact of the usual non lethal kinetic projectiles (like the FN303, the 40mm COUGAR), a finite element thorax model has been developed from thorax CT-scan images and the projectile FN303 was used. The model was validated by using results (force-time and deflection-time characteristics of the thorax) from experiments on PHMS published in the litterature. Two types of projectiles made of polyvinyl chloride cylinder with 37 mm diameter and respectively 28.5 mm and 100 mm long were used and the human tissue material models were found in open litterature. [less ▲]

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See detailNumerical simulation of nonlinear mechanical problems using Metafor
Boman, Romain ULg

Scientific conference (2014, May 16)

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See detailNumerical simulation of P-OLEDs
Nguyen, Ngoc Duy ULg

Report (2012)

Detailed reference viewed: 25 (0 ULg)