A. Pezzin, A. Ferri
Politecnico di Torino, Torino, Italy
Air permeability is one of the most important parameters in the study of thermo-physiological comfort of fabrics. The main goal of this work is to develop a virtual process that allows the prediction of air permeability of any fabric without realizing a sample. The Free and Porous Media Flow physics interface was used in COMSOL Multiphysics® software; this allows to use Navier-Stokes equation ...
C. Soares, N. Padoin, F. A. Cassini, M. Sanchez
Federal University of Santa Catarina, Florianópolis, SC, Brazil
University of Oklahoma, Norman, OK, USA
Plasma technology has potential applications in a wide range of areas, such as microwave reflectors/absorbers, material processing, sterilization and chemical neutralization. The knowledge about the fluid behavior in such systems has a central role, since the stability of the flow in the region of the electrical arc is essential for the development of a well-behaved torch. In this work, a ...
Departement of Mathematics and Statistic, Université Laval University, Quebec, Canada
This paper proposes a numerical simulation of the incompressible viscous flows with hyper dissipation using FEMLAB. We propose two variational formulations to solve this problem: the primal and the mixed formulations. For the first one, a biharmonic formulation for the velocity and the pressure is used. The second one uses a mixed formulation where the laplacian of the velocity, the velocity ...
Finite Element Simulation of the Oscillatory Flow in a Channel with the Heat Transfer through a Hot Bump
Dep. of Engineering Sciences, Embry-Riddle Aeronautical University
The present numerical simulation investigates the time-dependent flow driven by the oscillatory pressure gradient in the streamwise direction. An attempt was made to obtain the flow field that is initially stationary and evolves to the purely oscillatory flow with zero mean velocity, and the results after several cycles of oscillation are compared with the long-time analytical solution in the ...
F. Cipitì, L. Pino, A. Vita, M. Laganà, and V. Recupero
The paper presents a two-dimensional model to describe the gas flow in a propane autothermal reactor, developed at the CNR-ITAE Institute, and aimed to design a Beta 5 kWe hydrogen generator, named HYGen II, to be used with Polymer Electrolyte Fuel Cells (PEFCs) for residential applications. The main aim of the mathematical model was to optimize the reactor geometrical key parameters (diameter ...
M. Hackert, G. Meichsner, S.F. Jahn, and A. Schubert
Chemnitz University of Technology, Chair Micromanufacturing Technology, Germany
Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz, Germany
Electrochemical Machining is a potential procedure for micro manufacturing technology. Especially the absence of machining forces makes it advantageous for processing metals with high hardness and for the generation of complicated geometries. Applying a closed electrolytic free jet (Jet Electrochemical Machining - Jet-ECM) the electric current is restricted to a limited area. That allows working ...
COMSOL\'s new CFD Module has been tested for laminar and turbulent flows in simple geometries, with couple or segregated solver. These tests allow mesh sensitivities and comparison with analytical solutions. They also give a first idea of cpu time and RAM use for standard cases. In a second part a thermal-fluid simulation of a real industrial application is done: the air flows cooling a large and ...
Numerical Aspects of the Implementation of Artificial Boundary Conditions for Laminar Fluid-Structure Interactions
C. Boeckle, P. Wittwer
University of Geneva, Geneva, Switzerland
We discuss the implementation of artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane, for a range of low Reynolds numbers. When truncating the half-plane to a finite domain for numerical purposes, artificial boundaries appear. We present an explicit Dirichlet condition for the velocity at these boundaries in terms of an asymptotic expansion for the ...
OSRAM SYLVANIA, Beverly, MA, USA
COMSOL Multiphysics is used to simulate natural convection and its impact on peak operating temperatures of solid-sate lighting in thermally adverse conditions. PDE modes in the general form are used in conjunction with a thin-surface conduction formulation in the weak form. COMSOL is used to predict both temperatures and heat flows through numerous components of the configuration. Model ...
I. Lupelli, P. Gaudio, A. Malizia, R. Quaranta
Department of Industrial Engineering, University of Rome “Tor Vergata”, Roma, Italy
In this contribution we present the results of the numerical modeling and performance optimization study of a diaphragm pump for drug infusion. The main objective is to develop a numerical model that replicates the pumping cycle (400ms) and also provides indications about the variation of pumping performance as consequence of the variation of the chamber-diaphragm system geometry, diaphragm ...