You are invited to join us at COMSOL Day Los Angeles for a day of multiphysics modeling training, talks by invited speakers, and the opportunity to exchange ideas with other simulation specialists in the COMSOL community.
View the schedule for minicourse topics and presentation details. Register for free today.
This introductory demonstration will show you the fundamental workflow of the COMSOL Multiphysics® modeling environment. We will cover all of the key modeling steps, including geometry creation, setting up physics, meshing, solving, and postprocessing.
Ultrasonic Simulations with COMSOL Multiphysics®
I will describe the application of the COMSOL Multiphysics® software to the simulation of ultrasonic wave emission and propagation. In addition, I will discuss three particular applications, emphasizing the results obtained and the insights gained from simulations.
Three-dimensional eigenmode simulations have been used to predict the dependence of surface wave velocity on the resistivity of sensing overlayers. Simulations have also aided in the understanding of unexpected peaks in the input admittance of surface acoustic wave emitters. Frequency domain simulations have been used to understand the creation of ultrasonic nodes and antinodes in microfluidic channels bonded to a piezoelectric substrate. This is a multiphysics problem that includes the emission of ultrasonic waves by interdigitated transducers on a piezoelectric substrate, coupling of ultrasonic energy in microfluidic channels, and prediction of the trajectories of particles in the channels. In a final example, I will show how transient simulations can be used to gain insight into the propagation of ultrasonic pulses in a complex geometry.
Simulation of Noncontact Macroscopic Triboelectric and Tribological Device
Tribogenics has created a novel charge measurement device that is capable of accurately measuring the charge that is deposited on the surface of a polymer resulting from triboelectric charging as well as the tribological properties of the two materials, including the relative kinetic and dynamic friction. The current device is composed of a metal rod with a polymer that is dragged over it. A hanging weight is used to maintain the applied tension to the polymer, which in turn maintains the contact pressure between the polymer and the rod. Two metal cantilevers are placed above the polymer band. The deflection of the cantilevers determines the charge that is placed on the polymer band. In this paper, we describe the simulations of the functionality of the system. We simulate different charge densities on the band and measure the expected deflection of the cantilevers as well as the impact of a second cantilever on the measurement of the charge on the first cantilever. With the addition of grounded cups around the metal sphere, we are able to both reduce the amount of charge visible to the cantilever as well as remove the crosstalk between cantilevers. This will allow us to make a multipixel charge device capable of creating real-time mappings of charge on polymer surfaces. With the addition of multiple cantilevers, a real-time spatial charge mapping of the surface is possible.
Learn how to convert a model into a custom app using the Application Builder, which is included in the COMSOL Multiphysics® software. You can upload your apps to a COMSOL Server™ installation to access and run the apps from anywhere within your organization.
Get an introduction to the techniques for constructing your own linear or nonlinear systems of partial differential equations (PDEs), ordinary differential equations (ODEs), and algebraic equations within the COMSOL Multiphysics® software.
Learn about modeling high-frequency electromagnetic waves using the RF Module, Wave Optics Module, and Ray Optics Module.
Learn to use gradient-based optimization techniques and constraint equations to define and solve problems in shape, parameter, and topology optimization, as well as inverse modeling. The techniques shown are applicable for almost all types of models.
Get a brief overview of using the Structural Mechanics Module and its add-on modules within the COMSOL® software environment.
DWGreve Consulting David W. Greve became an emeritus professor of electrical and computer engineering at Carnegie Mellon University. During his time there, he also held courtesy appointments in the Department of Materials Science and Engineering and the Department of Physics. David offers consulting services through DWGreve Consulting, located in Sedona, Arizona. Since 2000, he has used the COMSOL Multiphysics® software, incorporating simulation results in numerous publications and conference presentations. His research focus is on silicon integrated circuit technology, especially the deposition and characterization of thin films and epitaxial layers, semiconductor device physics, and sensors. He is the author of books and review articles on semiconductor devices and technology and has been a co-chair for the International Ultrasonics Symposium.
Tribogenics, Inc. Dr. Eli Van Cleve got his PhD at the University of California, Irvine, in 2011 in low-temperature physics. He did his postdoctoral work at Lawrence Livermore National Laboratory before working at Tribogenics, Inc. in 2013. During his graduate and postgraduate work, Dr. Van Cleve constructed many experimental apparatuses, including the world’s most sensitive ellipsometer to measure submonolayers of helium, a closed-cycle pulse-tube helium-4 cryostat, and a calorimeter to measure hydrogen phase transitions in aerogels. While at Tribogenics, he has been instrumental in the development of the current band architecture, developing the theoretical basis of the technology and the modeling capability at the company.