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.

Hydraulic Design of Activated Sludge Tanks with CFD

A. J. Bosma, and B. A. Reitsma
Tauw bv, Deventer, The Netherlands

The hydraulic design of wastewater treatment plants (WWTP) is usually based on general guidelines and experience. Research and development in this field is mainly focused on understanding and improvement of the biological processes. In this article we present modeling of the activated sludge tanks of the wastewater treatment plants in Amsterdam-West and Eindhoven. For both locations, a number of ...

On The Modelling Of Electrowetting Using COMSOL Multiphysics

J.F. Dannenberg, J. Brinkert, and E.A.D. Lamers
Reden b.v., Hengelo (ov.), The Netherlands

One of the upcoming technologies in displays is that of the electrowetting displays. A surface can be covered by a colored oil or transparent water using a voltage to increase or decrease the wettability of the surface. A simulation of the behavior of such a thin film of oil in water, forced to move due an electrostatic field, has been made using the level-set, two-phase flow application mode ...

Application of COMSOL Multiphysics® Pipe Flow Module to Develop a High Flux Isotope Reactor (HFIR) System Loop Model

P. K. Jain[1], D. Wang[1], J. D. Freels[1]
[1]Oak Ridge National Laboratory, Oak Ridge, TN, USA

Oak Ridge National Laboratory’s High Flux Isotope Reactor (HFIR) is the highest flux reactor-based source of neutrons for research in the United States. Thermal and cold neutrons produced by HFIR are used to study physics, chemistry, material science, engineering, and biology. Currently, RELAP5 code is the primary transient safety analysis tool used to perform thermal-hydraulic system safety ...

Numerical Study of the Self-ignition of Tetrafluoroethylene in a 100-dm3-reactor

F. Ferrero[1], M. Kluge[1], R. Zeps[1], T. Spoormaker[2]
[1]BAM Federal Institute for Materials Research and Testing, Berlin, Germany
[2]Chairman PlasticsEurope Fluoropolymers TFE Safety Task Force, Du Pont De Nemours, Dordrecht, The Netherlands

The self-ignition of tetrafluoroethylene (TFE) caused by contact with hot surfaces has been analyzed with the help of simulations performed with COMSOL Multiphysics®. The current study focuses on large-scale heated reactors for the industrial production of polytetrafluoroethylene (PTFE) from TFE at high pressures. Simulations of the self-heating and consequent self-ignition of TFE in a ...

Simulation of the Molten Glass Sheets Flow

P. Baias[1], E. Pelster[1], D. Wenger[1]
[1]Wenger Engineering GmbH, Ulm, Baden-Württemberg, Germany

Thin glass sheets have nowadays a lot of commercial applications. An optimal functionality of the production of such glass sheets depends on the flow control of the molten glass. The uniform distribution of the molten glass to sheets of exact thickness and width depends on the geometry of the production device. The geometry must be based on fluid dynamics to control the process. A parameterized ...

Miscible Viscous Fingering of Pushed Versus Pulled Interface

S. Pramanik[1], M. Mishra[1]
[1]Indian Institute of Technology Ropar, Rupnagar, Punjab, India

Viscous fingering (VF) instability has been extensively studied over past several decades in the context of various industrial, environmental and chemical processes. We try to model miscible VF at pushed or pulled interfaces using COMSOL Multiphysics®. We study the effect of the positive and negative log-mobility ratio on the fingering instability. Numerical simulation has been performed in 2D ...

Mean Flow Augmented Acoustics in Rocket Systems - new

S. Fischbach[1]
[1]NASA Marshall Space Flight Center / Jacobs ESSSA Group, Huntsville, AL, USA

Combustion instability in solid rocket motors and liquid engines has long been a subject of concern. Recent advances in energy based modeling of combustion instabilities require accurate determination of acoustic frequencies and mode-shapes. Of particular interest is the acoustic mean flow interactions within the converging section of a rocket nozzle, where gradients of pressure, density, and ...

A Dual Continuum Model for Groundwater Flow in Karst Aquifers - new

R. Painter[1], J. Harris[1], T. Byl[1], L. Sharpe[1]
[1]Tennessee State University, Nashville, TN, USA

In karst terrain, the interaction between the fast moving, highly turbulent conduit flow and the slow moving, laminar flow through porous media is largely unknown. Yet the dual nature of the karst system impacts the residence time of solutes in the groundwater supplies of over 25% of the world’s population. This project attempts to address the need for a better understanding of the dual flow ...

The Flow of a Thin liquid Film Past a Cylinder

M. Sellier
Fraunhofer ITWM, Kaiserslautern

This paper presents a numerical study of the flow of a thin liquid film past a circular cylinder. It is investigated in the framework of the lubrication approximation and the corresponding governing equations, formulated in a weak form, are solved in the COMSOL environment. The effect of the diameter of the circular cylinder on the shape of the free surface is explored and potentially ...

An Analysis of Skimboard Hydrodynamics

N.D. Barnett[1], and E. Gutirrez-Miravete[2]
[1]General Dynamics-Electric Boat, Kingston, Rhode Island, USA
[2]Rensselaer at Hartford, Hartford, Connecticut, USA

This paper report on a study of the hydrodynamics of skimboards and surfboards using the computational fluid dynamics (CFD) module in COMSOL. The study analyzes the flow in a thin water layer underneath a skim board in a 2-D Cartesian coordinate. Three different sets of boundary conditions were employed and one of them produced the best agreement with previous findings.

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