Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Simulated Suspended Solid Concentrations of Secondary Clarifiers in the Activated Sludge Process using the COMSOL Multiphysics Program

C. Gavrila1, and I. Gruia2
1Technical University of Civil Engineering, Bucharest, Romania
2University of Bucharest, Bucharest, Romania

An activated sludge system accomplishes an enhanced biological purification of wastewater, and is the most frequently used system to purify such.The purification of wastewaters are dynamical systems, operating under important and uncontrolled variations of concentration and composition of the polluting substances. Mathematical models are essential for describing, predicting, and controlling these ...

Approaches for Fuel Cell Stack Modeling and Simulation with COMSOL Multiphysics

C. Siegel[1,2], G. Bandlamudi[1,2], P. Beckhaus[1], and A. Heinzel[1,2]
[1]Zentrum für BrennstoffzellenTechnik (ZBT), Duisburg, Germany
[2]University of Duisburg-Essen, Duisburg, Germany

This study highlights the possibility of using COMSOL Multiphysics for solving large scale PEM fuel cell stack models in the order of several million degrees of freedom (DOF). First, different gas flow channel configurations are solved in order to highlight the fluid flow and pressure behaviour. For these models, the full 3D Navier-Stokes equations are solved. It is seen that the amount of fluid ...

Simulation of the Inverse Extrusion of a Brass Rod by the Coupling of Fluid, Mechanical, Thermal and Ale Modules

C. Mapelli, and L. Bergami
Politecnico di Milano

An efficient simulation of the inverse extrusion process has been performed through the coupling of three modules in COMSOL Multiphysics: fluid-dynamics, general heat transfer and ALE. The strain, the strain rate, and the stress field can be completely defined after the complete definition of the velocity field of the material under the action of the tool. The definition of the stresses and of ...

Creating Business Opportunities using Mathematical Modeling

E. M. Fontes
Catella Generics AB

Computational mathematical modeling has allowed scientists and engineers to perform better, faster, and more economical virtual experiments. Through mathematical modeling, an application expert can simulate performance characteristics during different operating conditions and thereby accelerate the pace of understanding new electrochemical system in relation to specific application ...

Application of FEMLAB on supercritical hydrogen components of the high flux isotope reactor cold source

Freels, J.D.
Oak Ridge National Laboratory, Oak Ridge, TN

FEMLAB has played a key role in the design and safety analysis of several key components of the new High Flux Isotope Reactor (HFIR) hydrogen (H2) cold neutron source (CS) at Oak Ridge National Laboratory (ORNL). The main components of interest for the detailed analysis capability of FEMLAB are those where the H2 temperature spans a large range causing the fluid properties to change dramatically ...

Multiphysical Modeling of Calcium Carbonate Transportation in UV Disinfection in Water Treatment

E. R. Blatchley[1], and B.Z. Sun[1]
[1]Department of Civil Engineering, Purdue University, West Lafayette, IN, USA

Mineral precipitation on to the quartz surface of the lamp jackets in UV disinfection process (fouling) has been recognized as a major problem for UV radiation delivery during disinfection operation. Fouling behavior was observed to be induced thermally and influenced by hydraulic character of the UV disinfection configuration. Fouling process involves momentum, heat, and mass transport within ...

Coupling Miscible Flow and Geochemistry for Carbon Dioxide Flooding into North Sea Chalk Reservoir

B. Niu[1], W. Yan[1], A.A. Shapiro[1], and E.H. Stenby[1]

[1]Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark

As an effective method to cope with green-house gas emission, and to enhance oil recovery, injection of carbon dioxide into oil reservoirs has obtained increasing attentions. The flooding process involves complex phase behavior among oil, brine and CO2, and geochemical reaction between CO2 and rock. COMSOL Multiphysics® was first applied to simulating two flooding processes with known ...

Modeling the Coupled Mass Transfer Phenomena During Osmotic Dehydration of Fresh and Frozen Mango Tissues

J. Floury[1], Q.T. Pham[2], and A. Le Bail[3]
[1] UMR STLO–INRA–Agrocampus
[2] School of Chemical Engineering and Industrial Chemistry, UNSW
Sydney, Australia.
[3] UMR CNRS GEPEA–ENITIAA, Nantes

In this paper, we present a mathematical model for simulating the mass transfer, during the osmotic dehydration of mango cubes. The mass balance equation for the transport of each constituent is established separately for intracellular and extracellular volumes but accounts for the mass exchange across the cell membrane and the shrinkage of whole tissue.

Inverse Methods in Engineering Modelling

William B.J. Zimmerman
University of Sheffield
Sheffield, UK

"All models are inverse problems". This presentation gives some clues to how COMSOL Multiphysics, and its integration with MATLAB, can run models 'backwards'. A number of examples are shown to exemplify the collaboration between modeling, calibration and interpolation. --------------------------------- Keynote speaker's biography: Professor WBJ Zimmerman BScEng (Princeton), MSc PhD ...

Cluster Diameter Determination of Gas-solid Dispersed Particles in a Fluidized Bed Reactor

M. Das
Department of Biotechnology, PESIT, Bangalore, Karnataka, India

Clustering is a common hydrodynamic characteristic observed among suspended gas-solid particles in a fast fluidized bed (FFB) regime of a circulating fluidized bed (CFB) system. In this paper clustering behavior has been studied with Geldart group B particles like coal and iron ore in a circulating fluidized bed of diameter 0.1016 m and height 5.62 m. The cluster size when calculated from the ...

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