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.

Numerically Generated g-functions for Ground Coupled Heat Pump Applications

J. Acuna[1], M. Fossa[2], P. Monzó[1]
[1]KTH Energy Technology, Stockholm, Sweden
[2]Dime, University of Genova, Genova, Italy

Ground-coupled heat pumps (GCHP) are successfully installed since at about 20 years in many countries to fulfill space conditioning requirements in building applications. In most cases the heat pump is connected to a system of vertical ground heat exchangers (as illustrated in Figure 1) where a fluid is circulated inside a system of pipes inserted in a deep borehole drilled in the soil. Drilling ...

Modeling of Ultrasonic Transducers and Ultrasonic Wave Propagation for Commercial Applications Using Finite Elements with Experimental Visualization of Waves for Validation - new

D. R. Andrews[1]
[1]Cambridge Ultrasonics, Over, UK

Finite element (FE) modelling of ultrasonic propagation using COMSOL Multiphysics® simulations can be used to create images of waves. Unfortunately, in time-stepping solutions, it is possible for numerical instabilities to grow large and dominate the solution adversely. Any design of transducer that is based upon poorly-configured FE models is unlikely to perform as expected and will almost ...

Estimation of Hydraulic Conductivity for a Heterogeneous Unsaturated Soil Using Electrical Resistivity and Level-Set Methods - new

T. K. Chou[1], M. Chouteau[1], J. S. Dubé[2]
[1]École Polytechnique de Montréal, Montréal, QC, Canada
[2]École de Technologie Supérieure, Montréal, QC, Canada

The estimation of the soil saturated hydraulic conductivity (Ks) is crucial in understanding water flow and transport of contaminants. There are many hydrological techniques available in determining this parameter (constant head method, in-situ soil analysis, etc...). While these techniques can provide quality data points, they are often limited by sparse data sampling and scale. Therefore ...

COMSOL 2D Simulation of Heavy Oil Recovery by Steam Assisted Gravity Drainage

I. I. Bogdanov, K. El Ganaoui, and A. M. Kamp
Centre Huile Lourde Ouvert et Expérimental (CHLOE), Pau, France

Multiphysics flexibility and computational performance of COMSOL gave us the idea to model SAGD (steam assisted gravity drainage), one of the popular thermal methods of oil recovery. The modeling is far from straightforward and requires solving a system of non-linear PDEs for thermal multiphase flow under conditions of thermodynamic (phase) equilibrium. This paper presents the main results of our ...

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.

A Numerical Simulation of Adsorption Using Non-Standard Isotherm Equations in COMSOL

A. Ortiz-Tapia, D. Lopez-Falcon, M. Diaz-Viera, S. Lopez-Ramirez, and J. Mendoza-dela-Cruz
Instituto Mexicano del Petroleo, D. F., Mexico

Numerical simulations of the equation of transport were performed using an adsorption isotherm equation, and a simple cubic polynomial. The 1D COMSOL implementation included solutes being injected from one face of a homogeneous, isotropic core (small sample of reservoir rock); where the concentration of injected surfactant was kept constant during the simulation. The spatial distribution of ...

Investigation of Hydraulic Fracture Re-Orientation Effects in Tight Gas Reservoirs

B. Hagemann[1], J. Wegner[1], L. Ganzer[1]
[1]Clausthal University of Technology, Clausthal-Zellerfeld, Germany

In tight gas formations where the low matrix permeability prevents successful and economic production rates, hydraulic fracturing is required to produce a well at economic rates. As production from the well and its initial fracture declines, re-fracturing treatments are required to accelerate recovery. The orientation of the following hydraulic fracture depends on the actual stress-state of the ...

The Simulation of Pore Scale Fluid Flow with Real World Geometries Obtained from X-Ray Computed Tomography

W. Fourie1, R. Said2, P. Young3, and D. L. Barnes1
1Department of Civil and Environmental Engineering, Water
and Environmental Research Center, University of Alaska, Fairbanks, AK, USA
2Simpleware, Ltd. Exeter, UK
3Computer Science and Mathematics, School of Engineering, University of Exeter, Exeter, UK

With the recent improvement of X-ray Computed Tomography and robust modeling tools, it is now possible to show that pore scale fluid flow modeled by the Navier-Stokes equation can be used to derive macro parameters of Darcy’s Law, such as the hydraulic conductivity. The model allows calculation of isotropy, tortuosity and dispersivity of the soil in all directions. These parameters, which are ...

Poroelastic Models of Stress Diffusion and Fault Re-Activation in Underground Injection

R. Nopper[1], J. Clark[2], C. Miller[1]
[1]DuPont Company, Wilmington, DE, USA
[2]DuPont Company, Beaumont, TX, USA

Stress and failure in the earth have long been observed to couple to hydrogeology. Poroelastic models, introduced by soil scientists, can account for strong two-way coupling between porous crustal rock formations and their pore fluids. Current efforts to provide new energy resources (water injection in EGS, enhanced oil recovery) and to reduce pollution (CO2 sequestration, deepwell disposal) ...

The Use of COMSOL for Integrated Hydrological Modeling

T. Fong, M. Chui, and D. L. Freyberg
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, USA

Hydrological processes and components are intrinsically coupled, and thus must often be modeled as an integrated system. Unfortunately, although a few modeling codes are available, integrated hydrological modeling remains a challenge.The objective of this paper is to explore the feasibility of using COMSOL Multiphysics for integrated hydrological modeling; in particular, using the generic ...

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