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.

Numerical Calculation of Effective Density and Compressibility Tensors in Periodic Porous Media: A Multi-Scale Asymptotic Method

C. Lee[1], M. Leamy[1], and J. Nadler[2]

[1]School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
[2]Georgia Tech Research Institute (GTRI), Georgia Institute of Technology

A major issue in predicting and controlling (via design) absorption properties of rigid porous media is the determination of the frequency-dependent effective density and compressibility tensors. Unlike previous research efforts which employ in-house and, oftentimes, multiple numerical procedures for determining these two essential tensors, we formulate their solution in terms of a set of micro ...

Possibility of Implicit LES for Two-Dimensional Incompressible Lid-Driven Cavity Flow Based on COMSOL Multiphysics

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

In the present paper, possibility of implicit large eddy simulation(LES) by using the laminar flow interface of COMSOL Multiphysics Ver.4.3a, has been examined for two-dimensional lid-driven cavity flow with the Reynolds number up to 1,000,000. The flow computations with time-dependent study step were executed stable for all cases treated here, even though no turbulence model is used. Although ...

Diffuse Interface Models for Metal Foams

B. Chinè[1], M. Monno[2], E. Repossi[3], M. Verani[3]
[1]Laboratorio MUSP Piacenza, Italy; ITCR, Esc. Ciencia e Ing. Materiales, Cartago, Costa Rica
[2]Laboratorio MUSP, Piacenza, Italy; Politecnico di Milano, Dip. Meccanica, Milano, Italy
[3]Politecnico di Milano, MOX-Dip. Matematica, Milano, Italy

The foaming process of a metal is a complex operation which needs to be closely controlled in order to guarantee the wanted properties, by avoiding the formation of defects in the structure of the material. In this work we use COMSOL Multiphysics® version 4.3b and apply the diffuse interface methods of the phase field technique available in the CFD module.To analyze a practical case, foams ...

Computational Evaluation of Improved Anaerobic Digestion Reactor Designs

A. A. Forbis-Stokes [1], M. A. Deshusses [1],
[1] Duke University, Durham, NC, USA

The purpose of this study was to investigate the impact on number of baffles placed in horizontal- or vertical-alignment of an anaerobic baffled reactor (HABR and ABR, respectively). Computational fluid dynamics was used to evaluate hydraulic performance of each and determine what number of compartments should be used to optimize reactor volume while adding minimal complexity. The findings ...

Numerical Simulation of Granular Solids’ Behaviour: Interaction with Gas

A. Zugliano[1], R. Artoni[2], A. Santomaso[2], and A. Primavera[1]
[1]Danieli & C. Officine Meccaniche S.p.a., Buttrio, UD, Italy
[2]DIPIC, Università di Padova, Padova, Italy

In previous works a dissipative hydrodynamic model was used to simulate the behavior of a dense granular solid flowing through silos with simple geometries or with internal devices, showing good agreement with experimental results. That model has been upgraded taking into account the interaction between the solid itself and a nonreactive gaseous stream flowing countercurrent through it. This ...

Coupled Palaehydrogeological Microbial and Geochemical Reactive Transport Model of the Olkiluoto Site (Finland)

P. Trinchero[1], M. Luna[1], J. Molinero[1], G. Román-Ross[1], F. Maia[1], A. Nardi[1], J. Löfman[2], P. Pitkänen[3], L. Koskinen[3]
[1]Amphos 21 Consulting, Barcelona, Spain
[2]VTT Energy, Finland
[3]Posiva Oy, Olkiluoto, Finland

Olkiluoto at Eurajoki has been selected as the final repository site for spent nuclear waste in Finland. This area has been affected, at regional scale, by land-uplift processes related to the ice withdrawal. These events have resulted in a complex and stratified heterogeneous hydrochemical system. The objective of this work was to develop a robust paleohydrogeological reactive transport (PRT) ...

COMSOL Multiphysics® Simulation of the Electrokinetic Effect in Gidrogeology

M. A. Narbut [1], K. V. Titov [1], P. K. Konosavsky [1],
[1] Saint Petersburg State University, Saint Petersburg, Russia

The groundwater flow is accompanied by the electric field with potential called usually the streaming potential or the Self-Potential (SP) to be measured on the ground surface (e.g., Rizzo et al., 2004; Bolève et al., 2007; Jardani et al., 2009). We studied numerically the SP signals associated with pumping test experiments in layered aquifers using COMSOL Multiphysics® software and GWFGEM ...

Development of a Single Cell Trapping Microfluidic Device

L. Weng [1], F. Ellett [1], J. F. Edd [1], M. Toner [1,2],
[1] Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
[2] Shriners Hospital for Children, Boston, MA, USA

Array-based technologies are important for many applications in drug discovery, microbiology and cell biology. A large-scale array of single cells allows high-throughput monitoring of behaviors of individual cells in parallel, avoiding the lack of cell specificity inherent to bulk measurement methods. Here, we designed a passive-pumping microfluidic device for trapping cells in an array and used ...

Dynamic Simulation of a Polymer Molecule Using COMSOL Multiphysics®: DNA Separation in a Microchannel

J. Park [1], S. Monjezi [1], M. Palaniappan [1], J. D. Jones [1], B. Behdani [1],
[1] Missouri University of Science and Technology, Rolla, MO, USA

In this study, COMSOL Multiphysics was used to simulate DNA separation within a microchannel based on the entropic trapping mechanism. The entropic trapping mechanism involves DNA molecules passing through a series of obstacles in a microchannel and different lengths of DNA exhibiting different elution times from the device based on their entropic tendencies. These lengths of DNA are treated as ...

CFD Investigation of Cross Bubbly Flow through a Bubble Column with Rectangular Geometry

N. M. Musa [1], D. Kuvshinov [1], P. Rubini [1],
[1] The University of Hull, Hull, East Yorkshire, United Kingdom

Impact of human activities on the climate is evident, and the recent anthropogenic production and discharge of greenhouse gases into the atmosphere is highest in history. The current climate change have had worldwide influence on human and natural systems for example; global warming, melting of ice and snow, and rise in sea level etc. (AGECC 2010, Council 2013, IPCC, 2014). Increase in the ...