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Rabat, Morocco

Yasso I.,URAC 13 | Gueraoui K.,University of Ottawa | Niazi A.,school Hassania of Casablanca | Zeggwagh G.,Laboratory of applied mathematics
International Review on Modelling and Simulations | Year: 2010

This article is in the context of the dimensioning methods of the flexible pavement. It concentrates on the problems of the taking into account of the loads of traffic according to the probabilistic parameters of the temperature, particularly for the analytical or incremental methods. After having presented the method of characterization of the bitumen binders according to their viscoelastic behavior to Morocco and Japan and the factors influencing the bearing capacity between these two countries. We are interested this time in dimensioning of a Moroccan flexible pavement with the incremental method of Japan. In these last, the deformations due to the loads of traffic, given on the basis of linear elastic modeling of the roadways (model of Burmister), are used for the estimate of the lifespan of the roadway. The real loads of traffic of the roadways are diversified of an area with another, as well on the level of their intensity as of their mode of application. It is through this vision of globalization that a comparison between the various models of dimensioning in particular between Morocco and Japan is carried out. Morocco although with these great geographical extents is a country which strongly depends on the climatic risks and although since a certain number of years of vast construction projects of new roadways and handing-over on level of the old roads are launched; one of the disadvantages major of this vast policy is the cost. The comparison compared to Japan seems interesting in measurement or although this country is classified among most advanced economically world, the problems are much more important in measurement or the materials rare on the one hand and are very regulated compared to the environmental laws on the other hand. Thus, it will be a question of presenting the philosophy of Japanese design pavements. Once this solved stage, it will be necessary to adapt methodology to the Moroccan model (drawn from the Moroccan catalog of pavement design) and to check the state of the constraints and deformations under imposed requests. Conclusions and prospects compared to the pavement design could be brought thereafter in order to improve the current methods of pavement design in Morocco. © 2010 Praise Worthy Prize S.r.l.-All rights reserved. Source


Sammouda M.,URAC 13 | Gueraoui K.,URAC 13 | Gueraoui K.,University of Ottawa | Driouich M.,URAC 13 | And 2 more authors.
International Review on Modelling and Simulations | Year: 2011

The objective of this work is to establish a numerical code in order to study the natural convection in a cylinder heated from bellow and filled with a porous media which has a variable porosity. A generalized non-Darcian porous medium model for natural convective flow has been developed taking into account the viscous forces within the fluid, The porosity of the medium is assumed to vary exponentially with distance from the wall. The dimensionless equations reveal some important dimensionless numbers controlling this phenomenon such as the thermal Rayleigh number, Ra, the number of Darcy, Da, the number of Prandtl, Pr, the aspect ratio, RA, and the porosity, e{open}. It is found that the variable porosity has an effect on the flow and the heat transfer rate. The established numerical code can also be used in various other industrial applications. © 2011 Praise Worthy Prize S.r.l. - All rights reserved. Source


Sammouda M.,URAC 13 | Sammouda M.,Abdus Salam International Center For Theoretical Physics | Gueraoui K.,URAC 13 | Gueraoui K.,University of Ottawa | And 3 more authors.
International Review of Mechanical Engineering | Year: 2012

Theoretical and numerical study of the phenomenon of natural convection in a cylindrical enclosure filled by a non-Darcy porous media and saturated by a Newtonian fluid. The porosity of the media considered is variable and approximated by an exponential function based on an empirical law and equal to the unity near the walls due to the effects of the walls. The hydrodynamic flow in the porous medium is governed by Forchheimer-Brinkman extension of Darcy model (EBFD) with non-uniform porosity. The dimensionless equations reveal some important dimensionless numbers controlling this phenomenon such as the thermal Rayleigh number, Ra, the number of Darcy, Da, the number of Prandtl, Pr, the aspect ratio, RA, and the porosity, ε. The results are discussed graphically. The heat exchange traduced by Nusselt number is also considered in the study. The results obtained under the limiting conditions were found to be in good agreement with the existing ones. The established numerical code can also be used in various other industrial applications. © 2012 Praise Worthy Prize S.r.l. Source

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