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See detailEulerian Formulation of a Drillstring Constrained inside a Curved Borehole
Denoël, Vincent ULg; Detournay, Emmanuel

Conference (2011)

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See detailEulerian Formulation of Constrained Elastica
Denoël, Vincent ULg; Detournay, Emmanuel

in International Journal of Solids and Structures (2011), 136

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See detailEulerian Formulation of Spatially Constrained Elastic Rods
Huynen, Alexandre ULg

Doctoral thesis (2015)

Slender elastic rods are ubiquitous in nature and technology. For a vast majority of applications, the rod deflection is restricted by an external constraint and a significant part of the elastic body is ... [more ▼]

Slender elastic rods are ubiquitous in nature and technology. For a vast majority of applications, the rod deflection is restricted by an external constraint and a significant part of the elastic body is in contact with a stiff constraining surface. The research work presented in this doctoral dissertation formulates a computational model for the solution of elastic rods constrained inside or around frictionless tube-like surfaces. The segmentation strategy adopted to cope with this complex class of problems consists in sequencing the global problem into, comparatively simpler, elementary problems either in continuous contact with the constraint or contact-free between their extremities. Within the conventional Lagrangian formulation of elastic rods, this approach is however associated with two major drawbacks. First, the boundary conditions specifying the locations of the rod centerline at both extremities of each elementary problem lead to the establishment of isoperimetric constraints, i.e., integral constraints on the unknown length of the rod. Second, the assessment of the unilateral contact condition requires, in principle, the comparison of two curves parametrized by distinct curvilinear coordinates, viz. the rod centerline and the constraint axis. Both conspire to burden the computations associated with the method. To streamline the solution along the elementary problems and rationalize the assessment of the unilateral contact condition, the rod governing equations are reformulated within the Eulerian framework of the constraint. The methodical exploration of both types of elementary problems leads to specific formulations of the rod governing equations that stress the profound connection between the mechanics of the rod and the geometry of the constraint surface. The proposed Eulerian reformulation, which restates the rod local equilibrium in terms of the curvilinear coordinate associated with the constraint axis, describes the rod deformed configuration by means of either its relative position with respect to the constraint axis (contact-free segments) or its angular position on the constraint surface (continuous contacts.) This formulation circumvents both drawbacks that afflict the conventional Lagrangian approach associated with the segmentation strategy. As the a priori unknown domain, viz. the rod length, is substituted for the known constraint axis, the free boundary problem and the associated isoperimetric constraints are converted into a classical two-point boundary value problem. Additionally, the description of the rod deflection by means of its eccentricity with respect to the constraint axis trivializes the assessment of the unilateral contact condition. Along continuous contacts, this formulation expresses the strain variables, measuring the rod change of shape, in terms of the geometric invariants of the constraint surface, and emphasizes the influence of the constraint local geometry on the reaction pressure. Formalizing the segmentation strategy, a computational model that exploits the Eulerian formulation of the rod governing equations is devised. To solve the quasi-static deflection of elastic rods constrained inside or around a tube-like surface, this computational model identifies the number of contacts, their nature (either discrete or continuous), and the rod configuration at the connections that satisfies the unilateral contact condition and preserves the rod integrity along the sequence of elementary problems. [less ▲]

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See detailEulerian Formulation of the Constrained Spatial Elastica
Huynen, Alexandre ULg

Report (2013)

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See detailEulerian Formulation of the Torque and Drag Problem
Huynen, Alexandre ULg; Detournay, Emmanuel; Denoël, Vincent ULg

in Detournay, Emmanuel; Denoël, Vincent; van de Wouw, Nathan (Eds.) Third International Colloquium on Nonlinear Dynamics and Control of Deep Drilling Systems (2014, May)

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See detailEulerian-Lagrangian Treatment of Contact Problems. Application to Metal Forming Simulation via FEM
Ponthot, Jean-Philippe ULg

in Proceedings of "New Advances in Computational Structural Mechanics (1991)

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See detailEuler–Lagrange approach to model heterogeneities in stirred tank bioreactors – Comparison to experimental flow characterization and particle tracking
Delafosse, Angélique ULg; Calvo, Sébastien ULg; Collignon, Marie-Laure ULg et al

in Chemical Engineering Science (2015), 134

The aim of this work is the validation of an Euler–Lagrange modeling approach coupling a CFD-based compartment model (Eulerian approach) and a stochastic model based on a Continuous-Time Markov Chain ... [more ▼]

The aim of this work is the validation of an Euler–Lagrange modeling approach coupling a CFD-based compartment model (Eulerian approach) and a stochastic model based on a Continuous-Time Markov Chain (Lagrangian approach). The turbulent flow structure and the mixing process in a bioreactor stirred by an axial Mixel TT impeller is characterized by PIV and tracer experiments. Comparison between experimental and numerical data shows that the CFD-based compartment model is able to reproduce accurately the spatial heterogeneities inside the bioreactor. The trajectory of a small tracer particle which perfectly follows the fluid flow is measured by optical trajectography. It is then simulated by a stochastic model which is either based on an homogeneous or on an inhomogeneous Continuous Time Markov Chain (CTMC). Comparison of residence and circulation time distributions in three zones defined inside the bioreactor shows that the inhomogeneous CTMC model predicts with an excellent accuracy the particle trajectories inside the bioreactor. The modeling approach proposed here could be an useful tool to design scale-down bioreactors in order to reproduce at lab-scale the stress levels encountered in large-scale production bioreactors and to characterize and compare different bioreactor configurations. [less ▲]

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See detailEupen-Malmedy
Brüll, Christoph ULg

in Gruner, Wolf; Osterloh, Jörg (Eds.) The Greater German Reich and the Jews. Nazi Persecution Policies in the Annexed Territories 1935-1945 (2015)

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See detailEupen-Malmedy
Brüll, Christoph ULg

in Daniel, Ute; Gatrell, Peter; Janz, Oliver (Eds.) 1914-1918-online. International Encyclopedia of the First World War (2014)

Eupen-Malmedy is the name given to the two districts that Germany ceded to Belgium in 1920 as a consequence of the Treaty of Versailles. This cession and the semblance of a “referendum”, organised in 1920 ... [more ▼]

Eupen-Malmedy is the name given to the two districts that Germany ceded to Belgium in 1920 as a consequence of the Treaty of Versailles. This cession and the semblance of a “referendum”, organised in 1920, turned the territory into a Belgian-German conflict space during the interwar years. [less ▲]

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See detailEupen-Malmedy
Brüll, Christoph ULg

in Gruner, Wolf (Ed.) Das "Großdeutsche Reich" und die Juden. Nationalsozialistische Verfolgungspolitik in den "angegliederten" Gebieten (2010)

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See detailEupen-Malmedy 1918-1945. Le temps des déchirures
Brüll, Christoph ULg

in Boulengier-Sedyn, Renée (Ed.) Hommage à Henri Bragard (1877-1944) (2009)

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See detail„Euphorische Heimkehr“? Hilde Domins Ankunft im Literaturbetrieb der Nachkriegszeit
Viehöver, Vera ULg

in Häntzschel, Günter; Hanuschek, Sven; Leuschner, Ulriker (Eds.) Zur Präsenz deutschsprachiger Autorinnen. Frauen und Medien (2010)

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See detailEUR 10841 - Marginal agricultural land and efficient afforestation
Bock, Laurent ULg; Rondeux, Jacques ULg

Book published by Office for Official Publications of the European Communities (1990)

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See detailEurabian Nights: From Narrative Identities to Imagined Communities
Claisse, Frédéric ULg

Conference (2013, September)

Though the themes of ‘counter-jihad’ and ‘islamofascism’ contributed to somehow renew the far right discourse, it is arguable that the core structure of the underlying political narrative remained ... [more ▼]

Though the themes of ‘counter-jihad’ and ‘islamofascism’ contributed to somehow renew the far right discourse, it is arguable that the core structure of the underlying political narrative remained unchanged – ‘Muslims’ merely taking the place of Jews in the role of ‘enemies from within’, while Islam superseded communism as the major totalitarian threat to the Western world. Taken as a globalised narrative, counter-jihad discourse displays striking differences between its North American and European versions, the former emphasizing Islam as a rather external, terrorist threat, whereas the latter denounces it as a cultural peril, resulting from an alleged failure of multiculturalism both as a policy and as an ideology. The ‘Eurabia’ conspiracy theory often serves as the bedrock of these narratives: a deliberate, albeit covert policy framework set by European and Arab leaders in order to gradually establish a Muslim majority in Europe. Still, the question remains whether these new discursive entities function as pure ‘identity markers’ or reveal original, unprecedented forms of ‘imagined communities’ (B. Anderson). In this respect, the Eurabian scenario contrasts sharply with the traditional far right rhetoric of decline: as it sets a seemingly inescapable, dystopian horizon, it paradoxically presupposes the existence of an organized political community actually able to do something to prevent that dark future from happening. Through ‘heuristics of fear’ (H. Jonas), Eurabia aims at creating a community of politically aware individuals and empowering them for current and future struggles. In our paper, we propose to analyse such ‘imaginary institution’ of a counter-jihad society. Using controversy mapping tools to show the relation between actors of the movement, we will particularly focus on the blogging community and its notably prominent role in the spreading and structuring of the Eurabian dystopia. [less ▲]

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See detailEUREF Related Activities in Belgium
Bruyninx, Carine; Carpentier, Georges; Lejeune, Sandrine et al

in Torres, J.; Hornik, H. (Eds.) EUREF Publication No. 13 (2004)

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See detailEUREF Related Activities in Belgium
Bruyninx, Carine; Evraerts, Michel; Mues, F. et al

in Torres, J.; Hornik, H. (Eds.) EUREF Publication (2001)

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See detailEUREF Related Activities in Belgium
Bruyninx, Carine; Carpentier, Goerges; De Vidts, B. et al

in EUREF Publication No 14 (2006)

Detailed reference viewed: 17 (2 ULg)
See detailL'Euregio Meuse-Rhin : Dynamique de l'État-nation et des identités nationales dans une région frontalière européenne
Martiniello, Marco ULg; Massart, G.

in Kotek, J. (Ed.) L'Europe et ses villes-frontières (1996)

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See detailEuregio Meuse-Rhin, Maas-Rhein, Maas-Rijn, Meuse-Rhine
Merenne-Schoumaker, Bernadette ULg; Jourdan, Nathalie ULg

Book published by Région Wallonne et Feder (1995)

Brochure promoting economic Euregio Meuse-Rhine in four languages: French, Dutch, German and English with 11 original maps

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See detailEuregio Meuse-Rhin, Maas-Rijn, Maas-Rhein, Meuse-Rhine
Merenne-Schoumaker, Bernadette ULg; Lambotte, Jean-Marc ULg

Book published by Groupe de Travail Economie de l’Euregio Meuse-Rhin - 2eme édition (1999)

New edition of a booklet published in 1995 with updating records

Detailed reference viewed: 15 (0 ULg)