Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Design of an Autonomous Millimeter Scale Robot Using COMSOL

M.E. Karagozler, and S.C. Goldstein
Carnegie Mellon University, Pittsburgh, PA, USA

In this work, we describe the design of a new type of microrobot, the Catom, which is the basic unit of the modular robotic system Claytronics. The Catom is an autonomous, free standing, three dimensional microrobot, which uses electrostatically coupled electrodes to harvest power, actuate, and adhere to other robots. The Catoms are fabricated using lithography based fabrication techniques. The ...

Multiphysics Modeling of Applied Stresses and Strains in an Isolated Biologic Cell During Microfluidic Manipulation

Y. Liang[1], A. Saha[1], Z. Shi[1], R. Marcus[1], and S.S. Kohles[2]
[1]Central State University, Wilberforce, OH, USA
[2]Portland State University, Portland, OR, USA

In order to test the hypothesis that a controlled external mechanical stimulus may affect cellular regeneration or degeneration, we developed a three-dimensional computational model to explore the applications of a unique micromechanical environment in COMSOL. Recently, experimental stresses have been applied to living cells suspended by an optical trap within microchannel cross-junctional flows. ...

Predicting the Mechanical Properties of Biological Inspired Diatoms

M.F.D. Moreno, L.P. Davila, and F. Viscarra
University of California at Merced, Merced, CA, USA

Our computational work has focused on calculating the mechanical properties of diatom silica structures using COMSOL Multiphysics. We have used selected diatom geometries based on their structure classification and different loading conditions. Various 3D structures were modeled on Pro/ENGINEER, and then exported to COMSOL for further analysis. The mechanical behavior of diatom structures was ...

Electrochemical Modeling of Passive Film Formation on Steel in Simulated Concrete Pore Solutions

H.M. Bernardes[1], M. Mancio[2], and P.J.M. Monteiro[2]
[1]São Paulo State University, Ilha Solteira, SP, Brazil
[2]University of California, Berkeley, CA, USA

In this work, a tridimensional model of the electrochemical reactions taking place on the alloy/solution interface has been developed in the COMSOL Multiphysics environment. The model accounts for solution chemistry, cell potential, and solves the related mass, momentum and energy balances. The simulation is based mainly on the experimental results obtained by Mancio et al, which have employed ...

Response of Structures to Transient Loading

R.D. Costley, H. Diaz-Alvarez, and M.H. McKenna
U.S. Army Corps of Engineers, Washington, DC, USA

Large infrastructure, such as bridges, emits signals at their natural or driven frequencies of vibration, providing an indication of the structural condition that can be monitored without a need to physically touch the structure. In this presentation, a benchmark case for the transient excitation of a simple structure is investigated: the COMSOL and analytical solutions are compared for the ...

Increasing the Robustness of a Linear Transduction Pressure Sensor for Post-Processing Assembly

A. Dhawan[1], F. Li[1], A.G. Akingba[2], and J.V. Clark[1]

[1]Purdue University, West Lafayette, IN, USA
[2]Indiana University, Indianapolis, IN, USA

In this paper we numerically explore design variations to increase the resistance to rotation of our novel large-deflection, linear-transduction pressure sensor to increase its expected yield for post-processing assembly and misalignment. During post processing assembly, a diaphragm is anodically bonded to the base which contains comb drives. Once the diaphragm is in contact with the comb drive, ...

Piezoelectric Micromanipulator with Multiple Degrees of Freedom

J. Clark, O. Shukla, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we model and simulate a novel piezoelectric micromanipulator with multiple degrees of freedom with COMSOL. Micromanipulation is useful for micro and nanoscale assembly and manipulation in a variety of science and engineering areas. And the applications of micromanipulation increases with the number of degrees of freedom. Previous micromanipulation efforts used electro thermal or ...

Design and Simulation of Flying Microids

J. Clark, F. Li, B. Khandagale, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we present the first design and simulation results of flying microids. Microids are a particular type of microrobots that have insect-like dexterity. Our initial investigation into the ability of microids to walk, run, jump, turn, carry loads, and walk upside-down was previously presented. Having the ability to fly greatly extends transportability. Although others have previously ...

Harvesting Wind Energy for Microid Microrobots

J. Clark, F. Li, S. Naidu, R. Sahu, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we numerically investigate the feasibility of microids to harvest energy from the wind using the piezoelectric effect to recharge its energy supply. Microids are a particular subset of microrobots that have insect-like dexterity. In order for microids to function autonomously long-term outdoors, it is advantageous for them to be able to extract renewable energy from the environment. ...

Verifying the Measurement of Force, Displacement, and Stiffness of MEMS Using Electro Micro Metrology Through Nonideal Simulated Experiments

G. Campos[1], and J.V. Clark[2]
[1]Purdue University, Calumet, IN, USA,
[2]Purdue University, West Lafayette, IN, USA

In this paper we verify the measurement of force, displacement, and stiffness of micro electro mechanical systems (MEMS) using electro micro metrology (EMM) through nonideal simulated experiments in COMSOL. EMM is a metrological technique used to extract micro scale mechanical properties solely in terms of electrical measurands such as capacitance, voltage, or frequency. EMM uniquely facilitates ...

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