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Quantum Mechanics Applications Using the Time Dependent Schrödinger Equation in COMSOL Multiphysics® Software

A. J. Kalinowski [1],
[1] University of Connecticut, East Lyme, CT, USA

The paper illustrates the use of COMSOL for obtaining the quantum mechanics wave function Ψ(x,y,z,t) as a solution to the time dependent Schrödinger equation. Once having Ψ(x,y,z,t), it can be used to compute the probability of a particle being in a specific zone within the spatial field under consideration. Two problems are solved to illustrate solving Schrödinger's equation. Firstly, a simple ...

Extraction of Electrical Equivalent Circuit of One Port SAW Resonator Using FEM-based Simulation

A. K. Namdeo [1], H. B. Nemade [1],
[1] Department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India

The paper presents a method of extraction of electrical equivalent circuit of a one port surface acoustic wave (SAW) resonator from the results of simulation based on finite element method (FEM) using COMSOL Multiphysics software. A one port SAW resonator consists of large number of periodic interdigital transducer (IDT) electrodes fabricated on the surface of a piezoelectric substrate. A ...

COMSOL-Based Nuclear Reactor Kinetics Studies at the HFIR

D. Chandler[1], J. Freels[2], R. Primm III[3], and G. Maldonado[1]
[1]Department of Nuclear Engineering, University of Tennessee, Knoxville, TN
[2]Research Reactors Division, Oak Ridge National Laboratory, Oak Ridge, TN
[3]Primm Consulting, LLC., Knoxville, TN

The computational ability to accurately predict the dynamic behavior of a nuclear reactor core in response to reactivity-induced perturbations is an important subject in reactor physics. Space-time and point kinetics methodologies were developed for the purpose of studying the transient-induced behavior of the High Flux Isotope Reactor’s (HFIR) compact core. The space-time simulations employed ...

3D Simulation of Laser Interstitial Thermal Therapy in the Treatment of Brain Tumors

M. Nour [1], A. Lakhssassi [1], E. Kengne [1], M. Bougataya [1],
[1] Université du Québec en Outaouais, Gatineau, QC, Canada

Abstract: Due to the restriction of the number of probes that a patient can tolerate, and the inaccurate information provided by the invasive temperature measurements, which provide information only at discrete points, a mathematical model simulation is more effective to help doctors in planning their thermal treatment doses. This will maximize therapeutic effects while minimizing side effects. ...

Extraction of 13.56 MHz NFC-Reader Antenna Parameters for Matching Circuit Design

Prof. Dr.-Ing. habil. A. K. Palit [1],
[1] ZF-Lemfoerder Electronic GmbH, ZF-Friedrichshafen AG. Group, Espelkamp, Germany

Introduction: RFID system uses a Transponder and the near field communication (NFC) antenna and a matching circuit (Figure-1) in which at least latter two must be optimally designed for a higher efficiency. Typically, RFID antennas are flat inductive coils with 2 to 4 turns and are printed directly on the PCB. The larger antenna size implies larger operating distance whereas, the number of ...

Modelling of Pressure Profiles in a High Pressure Chamber using COMSOL Multiphysics

P. S. Rao[1], C. K. Chandra[1]
[1]Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, West Bengal, India

High Pressure Processing (HPP) is a leading non-thermal food processing technology that is often cited as a major technological innovation in food preservation. Although it is very early to place this emerging technology among the list of breakthroughs in food processing, HPP has started to become a viable commercial alternative for pasteurisation of value added fruits, vegetables, meat, and ...

Inductive Conductivity Measurement of Seawater

R. W. Pryor[1]
[1]Pryor Knowledge Systems, Inc., Bloomfield Hills, MI, USA

The conductivity of seawater directly correlates with the concentration of dissolved salts. This model demonstrates a new approach to the methodology of inductive conductivity measurement of seawater and other liquids. COMSOL Multiphysics® was used to build a parametrically swept model of an O-Core Inductive Conductivity Measurement Sensor for Seawater. This sensor model is built using the ...

COMSOL Multiphysics® Simulations of Cracking in Point Loaded Masonry with Randomly Distributed Material Properties

A.T. Vermeltfoort[1], A.W.M. van Schijndel[1]
[1]Eindhoven University of Technology, Eindhoven, The Netherlands

This paper describes COMSOL Multiphysics® simulations of the stress and crack development in the area where a masonry wall supports a floor. In these simulations one of the main material properties of calcium silicate, its E-value, was assigned randomly to the finite elements of the modeled specimen. Calcium silicate is a frequently used building material with a relatively brittle fracture ...

Calculation of Surface Acoustic Waves on a Piezoelectric Substrate using Amazon™ Cloud Computing

U. Vogel [1], M. Spindler [1], S. Wege [1], T. Gemming [1]
[1] Leibniz Institute for Solid State and Materials, Dresden, Germany

In this work, we seek to simulate SAWs for a better understanding and to benchmark the currently available cloud computing possibilities of COMSOL Multiphysics® software. By using the MEMS module we demonstrate 3D models with reduced geometry to achieve principle information about the wavefield. For a benchmark, a high-speed workstation with limited memory (RAM) is compared to the most potent ...

Design of Solar Thermal Dryers for 24-hour Food Drying Processes

F. S. Alleyne [1], R. R. Milczarek [1],
[1] Healthy Processed Foods Research Unit, U.S. Department of Agriculture, Albany, CA, USA

Solar drying is a ubiquitous method that has been adopted for many years as a food preservation method. Most of the published articles in the literature provide insight on the performance of solar dryers in service but little information on the dryer construction material selection process or material attributes that allow them to be selected as candidates in solar dryer designs. 1–7 ...