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.

Local Electroporation of Single Adherent Cells by Micro-Structured Needle Electrodes

K. K. Sriperumbudur[1], P. J. Koester[1], M. Stubbe[1], C. Tautorat[1], J. Held[2], W. Baumann[1], and J. Gimsa[1]
[1] University of Rostock, Chair of Biophysics, Gertrudenstr. 11a, 18057 Rostock, Germany
[2] Microsystem Material Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Germany

In spite of its low throughput, Patch-Clamp is the established method for intracellular measurements of the transmembrane potential. To address this problem, we have developed new biosensor-chips with micro-structured needle electrodes (MNEs). MNE-penetration of single cells growing on the MNE-tips leads to a situation comparable to the whole-cell mode in classical Patch Clamp. MNE-penetration ...

Gravity-Driven Film Flow: Design of Bottom Topography

C. Heining[1] and N. Aksel[1]

[1]Applied Mechanics and Fluid Dynamics, University of Bayreuth, Bayreuth, Germany

We study the gravity-driven film flow of a Newtonian liquid down an inclined plane. Many applications such as heat- and mass exchangers and evaporators or film coaters require undulated or rippled bottom topographies. In these cases, the interplay of gravity, surface tension and inertia leads to a response of the interface which furthermore strongly depends on the shape of the bottom topography. ...

Modelling of Melt Cast Cooling and Solidification Processes for Explosives

P. Lamy-Bracq[1] and C. Coulouarn[1]
[1]Nexter Munitions, Tarbes, France

A solidification process of casting explosives in shell is studied in this paper. An enthalpy method approach is used to model the solidification process. Both the thermal and mechanical effects are taken into account. An ALE (Arbitrary Lagrangian-Eulerian) method is used to represent the physical deformation due to solidification. Results from the model are verified against experimental results. ...

Simulation of Daisy Chain Flip-Chip Interconnections

G.S. Durante[1] and M. Fretz[1]

[1]CSEM Zentralschweiz, Alpnach Dorf, Switzerland

Flip-chip interconnection technologies have been tested through the use of a test chip with embedded single-bump daisy chains. The Flip-Chip technologies are selected among Au bump Thermocompression (TC) with and without Nonconductive Adhesives (NCA) underfiller, anisotropic conductive adhesive (ACA) bonding, and AuSn20 eutectic solder. The single bumps were then measured with a high precision ...

Finite Elemente Methode an zwei Stromungsbeispielen

Vogel, H-H.
Institut für Fahrzeugbau Wolfsburg, Fachhochschule Braunschweig/Wolfenbüttel

Die Finite Elemente Methode des Programmes FEMLAB wurde an zwei bekannten Beispielen der Stromungsmechanik und Warmeubertragung gepruft, um die Anwendungsmoglichkeiten in der Heizungs- und Klimatechnik aufzuzeigen. Modellfluid war jeweils trockene Luft im Umge-bungszustand. Der experimentelle Widerstandsbeiwert einer Kugel, der eine Funktion von der Reynolds-Zahl Re ist, wird bei vorgegebener ...

Thermo-Hydro-Mechanical Simulation of a 3D Fractured Porous Rock Preliminary Study of Coupled Matrix-fracture Hydraulics

Ababou, R., Cañamón, I., Elorza, J.
IMST, Tolouse, France

We present a problem involving the modeling of coupled flow and elastic strain in a 3D fractured porous rock, which requires prior homogenization (upscaling) of the fractured medium into an equivalent darcian anisotropic continuum. We present here a preliminary model and simulation results with FEMLAB®, for the hydraulic problem with anisotropic heterogeneous coefficients. The model is based ...

Normal Mode Analysis of the Chesapeake Bay using FEMLAB

McIlhany, K., Gillary, G., Malek-Madani, R.
Physics Dept., United States Naval Academy, Annapolis, MD

A Normal Mode Analysis (NMA) of the Chesapeake Bay was performed using Dirichlet boundary conditions and FEMLAB. The lowest 100 eigenstates were calculated and compared to a finite difference solution. Based on the normal modes derived numerically, surface current vector fields can be calculated. The vector fields of the Chesapeake Bay provide tools for the solution of problems such as the ...

FEMLAB/MATLAB model for complex electric swing adsorption (ESA) system with in-vessel condensation

Petkovska, M.1, Antov-Bozalo, D.1, Markovic A.1, Sullivan, P.2
1 Faculty of Technology and Metallurgy, University of Belgrade Karnegijeva 4, Belgrade, Serbia and Montenegro
2 AFRL/MLQF, Tyndall AFB, FL, USA

The subject of this investigation is a recently developed Electric Swing Adsorption (ESA) system (adsorption cycle with electrothermal desorption step, which is performed by direct heating of the adsorbent particles by passing electric current through them), with an adsorber assembled of two annular, radial-flow, cartridge-type fixed-beds, with in-vessel condensation. Three FEMLAB models were ...

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion

Jin, L.Z.1, Ssemakula, H.2, Sandström, R.1
1 Department of Materials Science and Engineering, Royal Institute of Technology, Sweden
2 Department of Production Engineering, Royal Institute of Technology, Sweden

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion with an insertion in the die has been studied through a finite-element model consisting of fluid dynamics and heat transfer approaches. The billet material is considered as rigid-visco-plastic and rate-sensitive. A dynamic viscosity, which is strain-rate and temperature dependent, has been integrated into the model. ...

Simulation of Convection in Water Phantom Induced by Periodic Radiation Heating

H.H. Chen-Mayer[1], and R. Tosh[1]
[1]Ionizing Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA

Water calorimetry is employed to establish a primary reference standard for radiation dosimetry by measuring the temperature rises in a water phantom (a cube of about 30 cm x 30 cm x 30 cm) subjected to a beam of ionizing radiation.  We use COMSOL Multiphysics to model the system using the Heat Transfer module and the Incompressible Navier-Stokes module with a geometry of 2D-axial ...

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