Technical Papers and Presentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquet des phénomènes électriques, mécaniques, fluidiques et chimiques. utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Modeling Residual Stresses in Arc Welding

F. Roger[1], and A. Traidia[2]
[1]ENSTA Paristech, Paris, France
[2]AREVA NP, Saint Marcel, France

The prediction of mechanical response of assemblies during arc welding necessitates the knowledge of thermal history of the components and the constitutive behavior of the materials. COMSOL can simulate thermal and structural interaction but it needs to evaluate the time evolution of internal variables like viscoplastic strain and hardening parameters. In the present paper we extend the ...

Finite Element Analysis of Thermal Fatigue in Thermal Barrier Coatings

U. Bardi[1], C. Borri[1], A. Fossati[1], A. Lavacchi[1], and I. Perissi[1]
[1]Dipartimento di Chimica, Università degli Studi di Firenze, Sesto Fiorentino, FI, Italy

A Finite element model of plasma sprayed TBC’s was developed to estimate the stress induced by thermal cycling experiments. A heat transfer analysis was performed to evaluate the temperature distribution on the specimen during the cooling under an impinging air jet; temperature measurements performed with an infrared pyrometer on the cooled samples show good agreement with the evaluated ...

A Modeling Study of Diffusion Wear of Carbide Tools in Titanium Machining

M. Crosskey and E. Gutierrez-Miravete
Department of Engineering and Science, Rensselaer at Hartford, Hartford, CT, USA

COMSOL Multiphysics has been used to model the temperature distribution produced inside a tool as a result of the forces and friction involved in a cutting process, along with the resulting diffusional flow of cobalt binder from the tool.The model uses as the input tool rake and flank face temperatures determined either experimentally or from other models, and then proceeds to couple the thermal ...

Sulfur Deactivation Effects on Catalytic Steam Reforming of Methane Produced by Biomass Gasification

P. Sadooghi[1], R. Rauch[1]
[1]Vienna University of Technology, Vienna, Austria

Sulfur, which is incorporated in the biomass structure, is released into the product gas during gasification as hydrogen sulfide. Hydrogen sulfide is known to deactivate nickel based steam reforming catalysts by chemisorption on the metal surface during steam reforming process. Desulfurization has a negative effect on the process efficiency therefore steam reforming has to be run without ...

Electrical and Thermal Analysis of an OLED Module

J. Kundrata[1], A. Baric[1]
[1]Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia

This paper presents the electrical and thermal analysis of an OLED module. The OLED module consists of the OLED tile and the DC-DC converter incorporated in its backplane. The DC-DC converter is realized as an integrated circuit and its inductor is embedded in the the backplane. The DC-DC converter is highly efficient, but a fraction of the electrical power is dissipated in the integrated circuit ...

Thermal Analysis of Induction Furnace

A. A. Bhat[1], S. Agarwal [1], D. Sujish[1], B. Muralidharan[1], B. P. Reddy[1], G. Padmakumar[1], K. K. Rajan[1]
[1]Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India

Induction furnaces are employed for vacuum distillation process to recover heavy metals after electro-refining operation. Induction furnace of suitable heating rate and cooled by passive means are required to be developed for this purpose. It is planned to set up a mock up induction furnace which will simulate the conditions to be realized in actual vacuum distillation furnace for this purpose. ...

Simulation of Exhaust Gas Heat Recovery System for an Automobile

Abhinav Prasad[1], David Neihguk[1], Anil Kumar Jaswal[1]
[1]Mahindra Research Valley, Mahindra World City, Chennai, Tamil Nadu, India

This paper presents the simulation of exhaust gas heat recovery system for an automobile using COMSOL Multiphysics®. A double pipe heat exchanger is modeled in which the tube side medium is the hot exhaust gas and the shell side medium is water. The problem is divided into three parts i.e. Laminar flow in water regime, Turbulent flow in exhaust gases and Heat Transfer in solids. They are solved ...

Thermal Performance of the New Bioclimatic Hall of the Historical Hospital in Florence

C. Balocco, and E. Marmonti
Dipartimento di Energetica “Sergio Stecco”
Università degli Studi di Firenze
Firenze, Italy

The main aim of the present work is the study of the thermal and energy performances of the new hall of the Old St.Maria Nuova Hospital in the center of Florence (Italy). Transient simulations were carried out of the 3D model of the hall to analyse the air flow patterns, distribution and velocity, provided by an existing typical fan-coils air system. The present study highlights the importance ...

Simulation of Dendritic Solidification in Cubic and HCP Crystals by Cellular Automaton and Phase-Field Models

M. A. Zaeem[1], H. Yin[2], and S. D. Felicelli[3]
[1]Center for Advanced Vehicular Systems, Mississippi State University, MS
[2]Oak Ridge National Laboratory, TN
[3]Mechanical Engineering Department, Mississippi State University, MS

A cellular automaton (CA)-finite element (FE) model and a phase field (PF)-FE model were used to simulate equiaxed dendritic growth during solidification of cubic and hexagonal crystals. The governing equations of PF model include three coupled partial differential equations (PDE) for evolution of concentration, temperature, and non-conserved PF variable. These PDEs were solved using the ...

Passive Cooling of Power Electronics: Heat in the Box

M. Berger[1], W. Schernus[1]
[1]West Coast University of Applied Sciences, Heide, Germany

Results presented are a contribution to the design of a 5kW-DC-AC-converter for applications in forklifts. The device is located in a closed environment and entirely operated with passive cooling. Due to concurrent engineering approach and environmental conditions correct prediction of absolute temperature values by simulation was crucial. Heat sinks have been modeled properly and a thermal ...

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