Eswaran M, P. Goyal, Anu Dutta, G.R. Reddy, R. K. Singh , K.K. Vaze
Bhabha Atomic Research Centre, Mumbai, India
A 2-D unsteady viscous flow around two cylinders is studied by numerical solutions of the unsteady Navier-Stokes equations with a finite element formulation using COMSOL Multiphysics®. The results of a numerical investigation of the Strouhal frequencies of two identical, stationary, parallel circular cylinders arranged in staggered configurations is presented in this paper. A simple two cylinder ...
Investigation of Mean-Flow Effects on Tubular Combustion Chamber Thermoacoustics Using a Burner Transfer Matrix Approach - new
A. Andreini, B. Facchini, A. Innocenti, D. Pampaloni
University of Florence, Florence, Italy
The paper presents a methodology to account for local mean-flow effects on thermo-acoustic instabilities to improve typical calculations performed under the zero-Mach number assumption. A 3D FEM model of a simplified combustor is solved with COMSOL Multiphysics® Pressure Acoustics interface. The Helmholtz equation is used to model the combustor and the classical k-τ model for the Flame Transfer ...
D. Samajdar, P. Podder, A. Bhattacharyya, S. Sen
Institute of Radio Physics and Electronics, University of Calcutta, Kolkata, WB, India
In the emerging field of MEMS microfluidics, micropumps and microvalves are two of the most important devices with a wide spectrum of applications such as programmable drug delivery systems, lab-on-a chip devices, µTAS (micro total analysis system), micro electric cooling applications etc. These microfluidic components are dominating the MEMS applications by virtue of their improved performance ...
K. Stein, N. Gessner, R. Peterson, A. Wiedmann
Department of Physics, Bethel University, St. Paul, MN, USA
Undergraduate studies are carried out to examine the supersonic flow from an axisymmetric converging-diverging nozzle. Flow in the nozzle is initiated by the rupture of a diaphragm that is positioned between the nozzle and a 1-gallon pressurized air tank. Simulations are carried out in COMSOL Multiphysics® for unsteady, axisymmetric flow with the High Mach Number interface of the CFD Module. ...
Simulation of Formwork Filling by Cement Fluid: The Effect of the Formwork Structure on Yield-stress Fluid
J. Park, N. Banerjee, M. Alfi, D. Feys
Missouri University of Science & Technology, Rolla, MO, USA
The flow of self-consolidating concrete (SCC) in formwork fillings was simulated as the flow of a single phase yield-stress fluid between two infinite plates by COMSOL Multiphysics®. The flow of SCC with varied rheological properties (yield stress and plastic viscosity) was verified in formworks with different configurations of reinforcement (rebars). Minimum and maximum limits of SCC ...
Optimization of Extrusion Processes for non-Newtonian high-Viscous Fluids with Wall Slip and Shear Thinning Effects
W. Hoffmann, M. Scholz
SiCo-Solutions, Stuttgart, Germany
Simulation of the flow behaviour of non-Newtonian fluids with high viscosities leads to special material models with specific material parameters. In this presentation, a material model consisting of 4 material parameters describing the flow itself and also the wall slip is presented. The investigations of the flow behaviour are based on COMSOL Multiphysics® using the Modules CFD, Structural ...
Vikas N Bhargav, Vivek Ganeshan, Muralidhara Holla, Ramesh Kolluru
Mechanical Engineering Department, BMS College of Engineering, Bangalore, India
Ejectors are the devices used to carry out mixing and recompression of two fluid streams, one with higher energy and the other with lower Energy. The high energy fluid is passed through the converging nozzle of ejector to very high velocities which in turn creates suction and draws the secondary fluid into the ejector through a secondary inlet. In the present work an attempt is made to ...
N.D. Barnett, and E. Gutirrez-Miravete
General Dynamics-Electric Boat, Kingston, Rhode Island, USA
Rensselaer at Hartford, Hartford, Connecticut, USA
This paper report on a study of the hydrodynamics of skimboards and surfboards using the computational fluid dynamics (CFD) module in COMSOL. The study analyzes the flow in a thin water layer underneath a skim board in a 2-D Cartesian coordinate. Three different sets of boundary conditions were employed and one of them produced the best agreement with previous findings.
E. Carcadea, M. Varlam, I. Stefanescu
National Research Institute for Isotopic & Cryogenic Technologies, Rm.Vâlcea, Romania
Steam methane reforming is a widely studied process because of its importance for hydrogen production. A two-dimensional membrane-reactor model was developed to investigate the steam-methane reforming reactions. The use of membrane as membrane-reactor separator offer us few advantages because it help in continuously removing the hydrogen from the reaction zone, shifting the chemical equilibrium ...
Department of Chemical Engineering, University of Arkansas, Fayetteville, AR, USA
During the hydraulic fracturing process, there can be possible re-activation of closed/sealed faults and natural fractures in the formation, which may lead to changes in the boundary conditions of the reservoir. While study models of shale gas formations have utilized the concept of a closed reservoir in order to optimize the production of gas in the well-bore, this assumption cannot be adopted ...