A stable fluid rigid body interaction algorithm: application to industrial problems

Paper No. PVP2004-2859Emerging Technology in Fluids, Structures, and Fluid Structure InteractionsVolume 1, Fluid Dynamics and Fluid Structure InteractionsConference Sponsors: Pressure Vessels and Piping DivisionISBN: 0-7918-4680-6International audienceFluid-mechanism interactions occur in a wide range of flow meter categories including turbine and positive displacement systems as well as many flow control devices. This paper outlines computational methods for calculating the dynamic interaction between moving parts and the flow in a flow meter system. Coupling of phenomena is allowed without need for access to the source codes and is thus suitable for use with commercially available codes. Two methods are presented one with an explicit integration of the equations of motion of the mechanism and the other with implicit integration. Both methods rely on a Navier-Stokes equation solver for the fluid flow. The more computationally expensive implicit method is recommended for mathematically stiff mechanisms such as piston movement. Example industrial applications shown are for positive displacement machines and axial turbines. The advances in mesh technology including deforming meshes with non-conformal sliding interfaces opens up this new field of application for Computational Fluid Dynamics and mechanical analysis in flow meter design

Un algorithme d'interaction fluide-solide rigide (application à la volumétrie)

POITIERS-BU Sciences (861942102) / SudocSudocFranceF

Experimental and Numerical Modelling of Shear Behaviour of Full-scale RC Slabs Under Concentrated Loads

International audienceIn nuclear buildings, situations such as localized heavy loads from equipment, slabs loaded by walls or columns are commonly found. For constructability and cost-effectiveness reasons, shear reinforcement of concrete is an important issue in a new nuclear plant project. This study presents an experimental and numerical investigation of the shear behaviour of full-scale reinforced concrete (RC) slabs without shear reinforcement under a concentrated load near a linear support in nuclear buildings. The main aim was to evaluate experimentally and numerically the influence of several variables: bottom longitudinal reinforcement, bottom transverse reinforcement, compressive strength, concrete aggregate size, slab depth and loading plate length on the shear behaviour of RC slabs under a concentrated load. First, an experimental campaign was performed: a series of ten tests on nine full-scale slabs (one slab measuring 3.2 m × 2.9 m × 0.3 m; six slabs measuring 4 m × 2.6 m × 0.3 m; one slab 4 m × 2.6 m × 0.35 m and one slab 4 m × 2.6 m × 0.4 m) already presented in Bui et al. (2016). The originality of this study is that three new tests added three full-scale slabs measuring 4 m × 2.6 m × 0.3 m to analyse the influence of the compressive strength and the loading plate length on the slabs' shear strength, which had not been tested in the 2016 study. Then concrete damaged plasticity (CDP) in Abaqus software was used for three-dimensional (3D) modelling and calibration. The proposed numerical model showed that the RC slabs' behaviour was in good agreement with the experimental results

Removal of phenol and colour of leachate of municipal solid waste by physico-chemical treatment using a liquid waste as a coagulant

A coagulation flocculation process combined with a Steel Industry Wastewater rich in ferric chloride (SIWW) and polymer were used to treat fresh leachate from municipal solid waste of the city Mohammedia. A central composite experimental design and response surface methodology were employed to evaluate and optimize the reagents dosage and to achieve a balance between efficiency and operational costs. The influence of pH was also evaluated to determine the most suitable pH condition. The best regression coefficients (R2) were obtained for phenol removal, colour removal and decanted sludge, with values of 0.89, 0.93 and 0.92 respectively. The most significant factors in the analysis of variance (ANOVA) in this study were pH and SIWW dosage. However, flocculant dosage was not most significant factor. Multiple response optimizations fits the optimum values of the factors and the responses as 40 mL.L-1 of coagulant, 12 mL.L-1 of polymer and 91% of phenol removal, 70% of colour removal and 38 mL.L-1 of decanted sludge at pH=6

Experimental investigation and analytical calculations on shear strength of full-scale RC slabs with shear reinforcement for nuclear power plants

International audienceIn this study, a series of 27 tests on 27 full-scale reinforced concrete (RC) slabs measuring 4 m × 2.6 m × 0.3 m is presented. RC slabs are frequently used in the construction of civil engineering structures such as buildings, car parks and bridges. They may be subjected to several types of forces acting, most often bending and shearing forces. Shearing forces have generally been more thoroughly investigated due to their brittle failure mode. This is especially the case for reinforced concrete slabs subjected to concentrated loads near to supports. Situations such as localized heavy loads from equipment and slabs loaded by walls or columns are commonly found and for constructability and cost-effectiveness reasons, shear reinforcement (stirrup) of concrete is an important issue in a power plant project. This new experimental study is a continuity of the previous studies conducted by Bui et al. (2017a,b) and Nana et al. (2017) in which all the slabs were tested without shear reinforcement. The originality in this study is that the slabs are this time studied with shear reinforcement except for references slabs. These full-scale slabs designed as usually in nuclear buildings, are submitted to a concentrated load near a linear support, the investigation of their shear behavior is presented. The main aim was to evaluate the influence of the shear reinforcement on the shear behaviour of slabs. The shear strength and the associated failure modes were quantified. Then we also addressed the influence of several variables such as bottom longitudinal reinforcement, tension and compression axial loads. Until now, rarely have experiments in the literature addressed the effect of the uniaxial load on the shear resistance of reinforced concrete slab. The experiments are used to evaluate the pertinence of Eurocode 2 for the shear design of reinforced concrete slabs in comparison with the French approach, the ACI 318-14 code and Model Code 2010 formulation using the level of approximation LoA II

Etude de mise en place d’un tri sélectif à l’université de Mohammedia, Maroc

The present research work is a contribution to the decision-making support in the management of domestic and assimilated waste produced by Hassan 2 University in Mohammedia. It supplies the reference data on the composition and the flow of production waste then identifies the various constraints (institutional, legal, financial, technical and/or educational), which limits the implementation of a continuous management and the establishment of a selective collection to the source. Besides, it allows us to determine the sustainable solutions and to propose an approach of development of this service.Therefore, we conducted five days for the collection and sorting of waste generated by the various institutions, which showed that the university is one of the largest producers of waste, (3900 euros are spent for the collection and processing of 113 tons each year). Also, the study exposed that the University household waste contains more than 60.70% of fermentable waste fully recyclable by simple methods, and 30.26% of reusable materials (glass, plastic, paper / cardboard, and metal).Le présent travail de recherche est une contribution d’aide à la décision dans la gestion des déchets ménagers et assimilés produits par l’université Hassan 2 de Mohammedia. Il fournit les données de référence sur la composition et le flux de production desdits déchets et identifie les différentes contraintes (institutionnelles, juridiques, financières, techniques et/ou éducationnelles) qui limitent la mise en place d’une gestion continue et l’instauration d’une collecte sélective à la source. En outre, cela permet de déterminer les solutions durables adéquates et de proposer une approche de développement de ce service.À cet effet, on a procédé durant cinq jours à la collecte et triage des déchets générés par cinq institutions universitaires. Ce travail a montré que l’université est parmi les gros producteurs de déchets, et que 3900 euros sont dépensés pour la collecte et traitement d’environ 113 tonnes produites chaque année. D’autre part, l’étude a permis de montrer que les ordures ménagères de l’université contiennent plus de 60,70 % de déchets fermentescibles entièrement valorisables par des simples procédés, 30,26 % de matériaux valorisables directement par recyclage (verre, plastique, papier / carton, et métal)

Influence of uniaxial tension and compression on shear strength of concrete slabs without shear reinforcement under concentrated loads

International audienceUnder the shear load, reinforced concrete structures may be simultaneously subjected to the axial tensile or compressive forces due to shrinkage in restrained members, earthquake, tornado, and so on. Until now, no experiment addressing the effect of the uniaxial load on the shear resistance of reinforced concrete slab has been reported in the literature. All the experimental tests found in the literature were conducted on panel and beam (or wide beam) specimens. The current shear design provisions with axial load (ACI 318 and Eurocode 2) were developed based solely on panel and beam tests and not slab tests. Therefore, the current shear design codes applied to slab structures under the effect of axial forces urgently need revision. The present research studies the shear strength tests of slabs under the concentrated load simply supported on four sides. The effect of the tension/compression forces on the shear capacity was studied on full-scale slabs without shear reinforcement, a design similar to the slabs used in nuclear buildings, under a concentrated load near support. Experimental tests were conducted to quantify the shear capacity and the associated failure modes with the influence of axial forces. In this study, a series of seven tests on seven full-scale slabs measuring 4 m × 2.6 m × 0.3 m is presented. The experiments were used to evaluate the pertinence of Eurocode 2 in terms of shear in reinforced concrete slabs with axial load, to compare these results to the AFCEN ETC-C code used for nuclear buildings, and to compare them to the ACI 318 code. The results showed that the axial tension forces equal to (average concrete tensile capacity) reduced the shear capacity up to 30% in the concrete slab experiments conducted