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.

Design of an Anisokinetic Probe for Sampling Radioactive Particles from Ducts of Nuclear Facilities

P. Geraldini [1],
[1] Sogin Spa, Rome, Italy

The aim of this study is to design a new concept of shrouded probe that meets the ISO 2889 requirements and it is suitable for small-ducts installation. In order to reduce the construction costs they have been considered standard stainless steel welding fittings manufactured according to ASME/ANSI specifications. In particular, with the numerical simulations, they have been firstly evaluated ...

Pneumo-Hydrodynamic Droplet Generation

V. Mamet [1], P. Namy [2], N. Berri [1], L. Tatoulian [1], P. Ehouarn [1], V. Briday [1], P. Clemenceau [2], B. Dupont [1]
[1] DBV Technologies, Bagneux, France
[2] SIMTEC, Grenoble, France

Introduction Droplet-based microfluidics is a large source of research for scientists of new biotechnologies, aerosols or other 2D-Microfluidics devices. Here, we will focus on an industrial application of a 3D microfluidic device : the PH2DG, Pneumo-HydroDynamic Droplet Generator. The aim of the process is to produce mono-disperse, regular pattern of droplets, with a minimum size. To use it in ...

Two-phase Flow Calculations in Pore Unit Cells Implementing Mixed FEM/Lattice-Boltzmann Simulators

E. D. Skouras [1][2], A. N. Kalarakis [2], M. S. Valavanides [3], V. N. Burganos [1],
[1] Foundation for Research and Technology, Hellas/Institute of Chemical Engineering Sciences, Patras, Greece
[2] Dept of Mechanical Engineering, TEI of Western Greece, Patras, Greece
[3] Dept of Civil Engineering, Applied Mechanics Laboratory, TEI of Athens, Athens, Greece

In general, macroscopic two-phase flow in porous media is a mixture of connected and disconnected oil flow. The latter is expressed as ganglion dynamics and drop traffic flow, patterns observed experimentally in pore network models [1,2] and real porous media [3,4]. This characteristic was adversely not taken into account in previous modeling approaches. The mechanistic model DeProF [5], ...

Implicit LES for Two-Dimensional Circular Cylinder Flow by Using COMSOL Multiphysics® Software - new

M. Hashiguchi[1]
[1]Keisoku Engineering System Co.,Ltd., Tokyo, Japan

In this paper, implicit Large Eddy Simulation (LES) based on finite-element analysis is performed in order to investigate two-dimensional circular cylinder incompressible flow. Implicit LES attempts time-dependent flow computation with no explicit turbulence model. Here, two types of circular cylinder with/without surface roughness, are treated. The Reynolds number Re based of the diameter of ...

Modeling of Non-isothermal Reacting Flow in Fluidized Bed Reactors

V. Orava [1], O. Souček [2], P. Cendula [1]
[1] Institute of Computational Physics, ZHAW, Winterthur, Switzerland
[2] Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic

We investigate a prototype concept of a back-up electricity device where we use liquid formic acid (FA) to produce a mixture of carbon dioxide (CO2) and hydrogen (H2) which is used in a PEM fuel cell, Fig. 1. In the fluidized bed reactor the liquid FA is decomposed to a gaseous mixture of CO2 and H2 in the presence of microscopic floating solid catalytic particles. We describe the system, ...

Effect of Substrate Contact Angle on Ink Transfer in Flexographic Printing - new

F. E. Hizir[1], D. E. Hardt[1]
[1]Massachusetts Institute of Technology, Cambridge, MA, USA

Flexography is a roll-based mass printing process used in manufacture of printed products such as sensors, self-cleaning surfaces, and flexible electronics. Flexography involves inking of a stamp wrapped around a roller, and the transfer of ink on the stamp surface to a printing substrate as the roller rotates against it. Ink transfer ratio from the stamp surface to the printing substrate is ...

A 1-D Model of the 4 Bed Molecular Sieve of the Carbon Dioxide Removal Assembly

R. Coker [1], J. Knox [1],
[1] NASA Marshall Space Flight Center, Huntsville, AL, USA

Introduction: Developments intended to improve system efficiency and reliability for water and carbon dioxide separation systems to be used on crewed vehicles combine sub-scale systems testing and multi-physics simulations. This paper describes the development of simulations in COMSOL Multiphysics® software in support of the Life Support Systems (LSS) project within NASA's Advanced Exploration ...

In Silico Evaluation of Local Hemodynamics Following Vena Cava Filter Deployment

J. Ferdous[1], M. Ghaly [2], V. B. Kolachalama [3], T. Shazly[1,4]
[1]Biomedical Engineering Program, University of South Carolina, Columbia, SC, USA
[2]Department of Biomedical Engineering, North Carolina State University, Raleigh, NC, USA
[3]Charles Stark Draper Laboratory, Cambridge, MA, USA
[4]Department of Mechanical Engineering, University of South Carolina, Columbia, SC, USA

Inferior vena cava (IVC) filters have become essential components in deep vein thrombosis treatment to prevent preventing pulmonary embolisms. Filter efficacy relies on maintaining IVC patency by preventing filter-induced thrombosis following clot capture. A computational model has been developed to determine whether a candidate filter design elicits hemodynamic patterns that promote thrombus ...

Comparing Different Approaches for Moisture Transfer Inside Constructions with Air Gaps

L. Nespoli[1], M. Bianchi Janetti[2], F. Ochs[2]
[1]Politecnico di Milano, Milan, Italy
[2]University of Innsbruck, Innsbruck, Austria

A model for the conjugate simulation of heat and moisture transfer inside porous materials and fluid domains is implemented in COMSOL Multiphysics®. The results of this model are compared with those obtained through a simplified approach: the line-source approach. The models are both validated with experimental data and with numerical results from other authors. On the one hand the conjugate ...

Computational Study on Transition of Oil-Water Flow Morphology due to Sudden Contraction in Microfluidic Channel - new

J. Chaudhuri[1], S. Timung[1], T. K. Mandal[1], D. Bandyopadhyay[1]
[1]Indian Institute of Technology Guwahati, Guwahati, Assam, India

The flow morphology of two immiscible fluids in a microfluidic device finds numerous applications such as emulsification, synthesis of nanomaterials [1], lab-on-a-chip devices and biological analysis [2]. It offers many advantages over the conventional macroscopic devices because of its availability for higher surface to volume ratio, ability to handle small volume of fluids, easier process ...