An open-source framework for the computer aided design of complex profile extrusion dies / Ananth Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 276-285 Titre : An open-source framework for the computer aided design of complex profile extrusion dies Type de document : texte imprimé Auteurs : Ananth Rajkumar, Auteur ; L. L. Ferras, Auteur ; C. Fernandes, Auteur ; Olga. S. Carneiro, Auteur ; A. Sacramento, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2018 Article en page(s) : p. 276-285 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Filières d'extrusion Fluides, Mécanique des Matières plastiques -- Extrusion Modèles numériques Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : This work presents a new design procedure for improving the flow distribution in complex profile extrusion dies. The proposed approach is based on open source software and aims to motivate both academics and industrials to consider numerical methodologies in their future developments. A new solver was implemented in OpenFOAM computational library in order to model the steady non-isothermal flow of inelastic fluids. The developed code was verified with the Method of Manufactured Solutions. The capability of the proposed design procedure was experimentally assessed with an industrial case study, and the results obtained suggest that the computational based design aid is an excellent alternative to the usual experimental trial-and-error procedure used in industry. Note de contenu : - DIE-DESIGN METHODOLOGY - NUMERICAL MODELLING CODE IMPLEMENTATION VERIFICATION : Governing equations - Solver verification - CASE STUDY : Material characterization - Design of a new extrusion die DOI : 10.3139/217.3516 En ligne : https://drive.google.com/file/d/1YenL_DR0pFFF9byXyQVUlPxdMMJ20jOQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30575 [article]

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Design guidelines to balance the flow distribution in complex profile extrusion dies / A. Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 28-71 Titre : Design guidelines to balance the flow distribution in complex profile extrusion dies Type de document : texte imprimé Auteurs : A. Rajkumar, Auteur ; L. L. Ferras, Auteur ; Olga. S. Carneiro, Auteur ; M. Becker, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2017 Article en page(s) : p. 28-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Analyse numérique Filières d'extrusion Homopolymères Polypropylène Profilés Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work a novel methodology to balance the flow distribution in complex extrusion dies is proposed. For this purpose, the profile cross section geometry is divided into simpler geometries (L and T shaped profiles), which are balanced with a surrogate model obtained by a detailed numerical study. The numerical simulations are performed considering the non-isothermal flow of Bird-Carreau inelastic fluids, and the numerical computations are performed with a solver implemented in OpenFOAM computational library. The proposed methodology is assessed with some case studies. Note de contenu : - GEOMETRY - GOVERNING EQUATIONS AND NUMERICAL METHOD : Governing equations - Numerical method - SURROGATE FLOW BALANCE MODELS : Case studies - Results and discussion - DIE DESIGN METHODOLOGY : Average method (stages) - Minimum method (stages) - DIE DESIGN METHODOLOGY ASSESSMENT DOI : 10.3139/217.3272 En ligne : https://drive.google.com/file/d/1QRJwacCgyG3Nhdg4Wp_c0dYg4RMqElYM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28002 [article]

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Using the GPU to design complex profile extrusion dies / N. D. Gonçalves in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 4 (08/2015) . - p. 442-450 Titre : Using the GPU to design complex profile extrusion dies Type de document : texte imprimé Auteurs : N. D. Gonçalves, Auteur ; S. P. Perreira, Auteur ; L. L. Ferras, Auteur ; J. M. Nóbrega, Auteur ; Olga. S. Carneiro, Auteur Année de publication : 2015 Article en page(s) : p. 442-450 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois Calcul Cathéter Composites à fibres végétales Ecoulement laminaire Filières d'extrusion Matériel médical Processeur graphique Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : In the present work the benefits of using graphics processing units (GPU) to aid the design of complex geometry profile extrusion dies, are studied. For that purpose, a 3D finite volume based code that employs unstructured meshes to solve and couple the continuity, momentum and energy conservation equations governing the fluid flow, together with a constitutive equation, was used. To evaluate the possibility of reducing the calculation time spent on the numerical calculations, the numerical code was parallelized in the GPU, using a simple programing approach without complex memory manipulations. For verification purposes, simulations were performed for three benchmark problems: Poiseuille flow, lid-driven cavity flow and flow around a cylinder. Subsequently, the code was used on the design of two real life extrusion dies for the production of a medical catheter and a wood plastic composite decking profile. To evaluate the benefits, the results obtained with the GPU parallelized code were compared, in terms of speedup, with a serial implementation of the same code, that traditionally runs on the central processing unit (CPU). The results obtained show that, even with the simple parallelization approach employed, it was possible to obtain a significant reduction of the computation times. Note de contenu : - GOVERNING EQUATIONS AND NUMERICAL PROCEDURE : Code implementation - CPU and GPU implementations - CASE STUDIES : Benchmark problems and code verification - Design of profile extrusion dies DOI : 10.3139/217.2957 En ligne : https://drive.google.com/file/d/1WuJpuCW9PrsvJfJ_s0jPwg_fkeT5SZN3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24853 [article]

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