COMSOL Multiphysics® Software Activities Within the Research Reactors Division of Oak Ridge National Laboratory
J. D. Freels , P. K. Jain , C. J. Hurt , F. G. Curtis , M. W. Crowell , E. L. Popov ,
 Oak Ridge National Laboratory, Oak Ridge, TN, USA
 University of Tennessee, Knoxville, TN, USA
INTRODUCTION Our group at ORNL started using COMSOL Multiphysics® software shortly after version 3.0 was released in the Spring of 2004. After 11 years and several releases, the application usage has grown along with number of licenses we are responsible for. This paper will broaden the scope and take a look at our past and present applications, and evaluate where we are headed with COMSOL ...
The Effect of Eccentricity in Fully Developed Annular Pipe Flow on Convection Heat Transfer and the Darcy Friction Factor
S. Rabbani , A. Elzawawy , J. D'Arrigo , J. D. Freels 
 Vaughn College of Aeronautics and Technology, New York, NY, USA
 Oak Ridge National Laboratory, Oak Ridge, TN, USA
Eccentricity in annular channels contributes to changes in fluid flow characteristics which in turn, affects the performance and integrity of the configuration. This research investigates a model of an annular channel with a diameter ratio of 0.762, an aspect ratio of 68.9:1 and heating of the internal surface of the inner cylinder with a 1.105MW/m2 heat flux. The Reynolds number ranges from 5 ...
A. Avanzini, D. Battini, M. Berardi
Università degli Studi di Brescia, Brescia, Italy
The complex behavior of biological prosthetic heart valves was simulated. A multiphysics computational approach was adopted using different modules of COMSOL Multiphysics: the LiveLink(TM) interface was used to exchange the valve geometry with CAD, Structural Mechanics Module to set loads, boundary conditions and implement anisotropic hyper-elastic constitutive laws for leaflet tissue, PDE to ...
E. Holzbecher , F. Sun ,
 German University of Technology in Oman, Muscat, Oman, Germany
 Georg-August-Universität, Göttingen, Germany
In boreholes nozzles have to be found advantageous to increase the infiltration rate of water into the subsurface ground. Studies and practice in the field shows that the infiltration of water into permeable aquifers can be improved, if the flow in the borehole is modified. Due to the nozzle the flow regime turns from linear to turbulent. CFD studies help to understand the physics of the ...
M. Ayala , P. Santos , G. Hamester , O. Ayala ,
 Department of Mechanical Engineering, Universidad de Oriente, Puerto La Cruz, Venezuela
 Brazil Scientific Mobility Program, CAPES, Brasilia DF, Brazil
 Department of Engineering Technology, Old Dominion University, Norfolk, VA, USA
As the flow passed through the pipe, and entered the bend, various vortical structures appear, meaning that there is a secondary flow emerging. Also while the flow is in the bend gravity forces affect distinctively its behavior as long as the centrifugal force is not greater. From this study, it appears that the fluid behavior on the pipe bend is strongly related to gravitational and ...
Steady and Unsteady Computational Results of Full Two Dimensional Governing Equations for Annular Internal Condensing Flows
R. Naik, S. Mitra, A. Narain, N. Shankar
Michigan Technological University, Houghton, MI, USA
This paper presents steady and unsteady computational results obtained from numerical solutions of the full two-dimensional governing equations for annular internal condensing flows in a channel. This is achieved by tracking the “sharp” interface while solving the flow fields using COMSOL Multiphysics® and MATLAB®. The unsteady wave simulation capability is used to predict heat-transfer rates ...
Modeling of Stockton University Geothermal System Using COMSOL Multiphysics® and the Subsurface Flow Module
M. Sharobeam , S. Pal , G. Villanuna ,
 School of Natural Sciences and Mathematics, Stockton University, Galloway, NJ, USA
Stockton University has one of the largest closed loop geothermal system in North America. It provides heating and cooling for the university academic facilities. The well field comprises of a grid of four hundred wells bored to a depth of 130m. The ground is composed of three aquifers of saturated sand sandwiched between confining beds and transition layers of sand and clay. The purpose of this ...
P. Geraldini ,
 Sogin S. p. A., Rome, Italy
Understanding the air flow patterns and aerosol trajectories in ventilated rooms can provide key information for determining where to place early warning and monitoring instruments, and how to minimize hazardous materials in the worker’s breathing zone. The dispersion within rooms can be influenced by complex interactions between numerous variables, but especially ventilation design and room ...
D. Conchouso, E. Al Rawashdeh, D. Castro, A. Arevalo, I.G. Foulds
King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
This document presents the Computational Fluid Dynamics (CFD) simulation of a commonly used Microfluidic Droplet Generator (MFDG) using the Laminar Two-Phase Flow, Phase Field method in COMSOL Multiphysics®. The paper discusses the effect of the channel’s geometry in droplet size at different flow rate ratios and total flow rates. We then propose a guide to best select a cross-sectional area ...
E. Tejaswini , B. Sreenivasulu , B. Srinivas ,
Gayatri Vidya Parishad College of Engineering, Visakhapatnam, Andhra Pradesh, India
In this work, the heat transfer characteristics of two heated cylinders of square cross-section immersed in a streaming Bingham plastic medium have been studied. The governing differential equations (continuity, momentum and thermal energy) have been solved numerically over wide range of conditions as: plastic Reynolds number, 0.1 ≤ Re ≤ 40, Prandtl number, 1 ≤ Pr ≤ 100, Bingham number, 0 ≤ Bn ≤ ...