In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Study of HVDC Grounding Systems Using Finite Element Methods

C. K. C. Arruda [1], A. A. Silveira [1], L. C. R. Vieira [1], F. C. Dart [1],
[1] CEPEL, Rio de Janeiro, RJ, Brazil

High Voltage Direct Current transmission (HVDC) is a suitable alternative for long distance transmission. During the years, the use of this technology has been increasing, which is one of the several reasons to improve methodologies in HVDC grounding systems. Unlike the usual approach in AC, a HVDC grounding system is distinguished by its operating procedures, which is, when it is configured ...

Poroelasticity Benchmarking for FEM on Analytical Solutions

E. Holzbecher[1]
[1]Georg-August Universität Göttingen, Göttingen, Germany

We examine the poroelastics mode, which couples hydraulics and mechanics by some basic benchmarks. For cases with analytical solutions we check the accuracy for changing meshes and calculate the convergence rate.

Modeling and Simulation of the Consolidation Behaviour of Cemented Paste Backfill

L. Cui [1], M. Fall [1],
[1] University of Ottawa, Ottawa, ON, Canada

In underground mining operations, the mined-out spaces (called stopes) need to be backfilled to maintain the stability of surrounding rock mass and increase the ore recovery. Cemented paste backfill (CPB), a mixture of water, binder, and tailings, has been intensively utilized in underground mining operations to fill the stopes. After preparation, the fresh CPB is transported into stopes via ...

Non-isothermal Flow of CO2 in Injection Wells: Evaluation of Different Injection Modes

O. Silva [1],
[1] Amphos 21 Consulting S.L., Barcelona, Spain

Injection conditions of CO2 at the wellhead may play a major role on the flow behavior through the wellbore. The density and the injection rate reached at the bottomhole are key factors affecting the performance and efficiency of CO2 geological storage. In this work, a model of non-isothermal flow of CO2 in injection wells is developed using COMSOL Multiphysics® software and used to assess ...

Transport, Growth, Decay and Sorption of Microorganisms and Nutrients through Porous Media: A Simulation with COMSOL

D. Lopez-Falcon, M. Diaz-Viera, and A. Ortiz-Tapia
Instituto Mexicano del Petroleo, México D.F., Mexico

Transport of microorganisms through porous media governs many phenomena in bioremediation of environmental pollution problems and microbial enhanced oil recovery. The aim of this work is to investigate the effects of some transport parameters on breakthrough curves as well as on spatial distribution of components transported through a porous medium by a fluid phase. Using COMSOL Multiphysics and ...

Application of the Focused Impedance Method (FIM) to Determine the Volume of an Object within a Volume Conductor

M. A. Kadir[1], S. P. Ahmed[2], G. D. Al Quaderi[3], R. Rahman[2], K. Siddique-e Rabbani[1]
[1]Department of Biomedical Physics & Technology, University of Dhaka, Dhaka, Bangladesh
[2]Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh
[3]Department of Physics, University of Dhaka, Dhaka, Bangladesh

Focused Impedance Method (FIM), a new technique of electrical impedance measurement having high sensitivity in the central region, can sense the change in transfer impedance of an object embedded at a shallow depth within a volume conductor of unchanging background conductivity, using electrodes at the surface. This paper presents a new method for measuring the volume of such an embedded object ...

Calibration of a Geothermal Energy Pile Model - new

R. Caulk[1], J. McCartney[2], E. Ghazanfari[1]
[1]University of Vermont, Burlington, VT, USA
[2]University of Colorado, Boulder, CO, USA

In this study, a model of in-situ geothermal energy piles was constructed using COMSOL Multiphysics® software. Geothermal energy piles serve two purposes, first to transfer building load into the subsurface, but also to extract thermal heat from surrounding soils. This is achieved using a heat pump coupled with embedded heat exchangers. As a result, a multiphysics problem is introduced - heat ...

Submarine Gas Hydrate Reservoir Simulations - A Gas/Liquid Fluid Flow Model for Gas Hydrate Containing Sediments - new

S. Schlüter[1], T. Hennig[1], G. Janicki[1], G. Deerberg[1]
[1]Fraunhofer UMSICHT, Oberhausen, Germany

In the medium term, gas hydrate reservoirs in the subsea sediment are intended as deposits for carbon dioxide (CO2) from fossil fuel consumption. This idea is supported by the fact, that CO2 hydrates are more stable than methane hydrates at certain conditions. The potential of producing methane by depressurization and/or by injecting CO2 is studied in the frame of the research project SUGAR. ...

Lithic Hypar: New Frontiers in Structural Stone Research

D. Malomo [1], V. Varano [2],
[1] DICEA, University of Rome, Italy
[2] LAMS, University of Rome, Italy

The "Lithic Hypar" research is based on the mechanical analysis of an innovative reinforced stone's structure, architecturally designed by Prof. Fallacara, University of Bari (Italy): the headquarters entrance portal of the French company SNBR (Société Nouvelle Batiment Régional) located in Troyes (France), the realization of which is planned for October 2015. The main idea of this lithic ...

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], ...