MEMS based piezoelectric Energy Harvesting
Dear all, I am working on MEMS based piezoelectric Energy Harvesting using cantilever structure. The Finite Element software I am using is Comsol Multiphysics 4.4. I have been successful in finding out...
View ArticleTwo phase Liquid Liquid extraction
Hello, I am trying to model mass transfer through interface of two liquid in a two phase model. I believe comsol by default applies flux continuity at the interface. However I also want to an...
View ArticleAbsolute pressure in water is smaller than expected.
Hello, I am modeling a PMUT idealised as a circular membrane that consist of AlN in between two Al electrodes. I am interested in the maximum pressure difference at a distance of the PMUT, when the...
View ArticleCannot generate Global Evaluation
Hi, I am using Comsol to simulate the electric field of two electrodes. Last time I used the Global Evaluation to calculate the capacitance between two electrodes by expression - component1 -...
View Articleeigen frequncy analysis in AT-Quartz resonator
hi i am working on at-quartz resonator as fuel adulteration detection sensor, but i want to know how to solve for eigen frequencies in quartz resonator model in the model library and also i want to add...
View ArticleEigenfrequency and Temperature in a Cantilever
Hello, I'm using COMSOL for some months. I'm simulating the eigenfrequency of a clamped-free beam (cantilever MEMS). The value of the eigenfrequency at room temperautre is correct (about 6.4MHz) but...
View ArticleMoving Mesh (ale) with magnetic fields
Hello, I am working on a simulation to use a magnet to pull another magnet. My model couples the Structural Mechanics Module (solid), the Moving Mesh Module (ale), and the Magnetic field Module ( mf)....
View ArticleSimple Question for Flow Rate
Hello, I already done a few simulations with "laminar flow" using time dependent with rectangular input. Input was "pressure, no viscous stress". Is there any ways of getting the flow rate from...
View ArticleMixing two different fluids in fluid flow
Hi I have been working on a flow analyzer that has two inlet and an outlet. I have two fluids, one is very dense and the other is a very dilute substance, both of them are completely different and they...
View ArticleSimulation of Van der Waals forces using Comsol v4.3
I'm trying to simulate the attractive Van der Waals force between two nanometric structures. My initial idea was to integrate the Lennard-Jones potential created by one domain (\integral...
View ArticleMoving Mesh with Solid Mechanics and Electrostatics
Hi, I am trying to model a capacitive force sensor in COMSOL using solid mechanics and electrostatics physics. The model consists of a nylon spring between 2 silicon capacitor plates that experience a...
View Articlepiezoelectric reference impedance pzd.Zref
Hello, I am doing a comsol simulation. In my piezoelectric setup I noticed that I have the option for reference impedance and is automatically set to 50[Ohms]. Can someone explain what this impedance...
View ArticleErrors in Electromechanical copuling with Nernst-Planck equation
I tried to simulate the electromechanics of polymer-metal actuator (IPMC) with involve ions migration i.e. Nernst-Planck equation. I made 2 components i.e. Studies (time dependent) with identity...
View ArticleCoupling Matrix Values
Hi All, I am new to comsol. I cannot find the answer to what Coupling matrix indicates. I am trying to solve for a geometry with piezoelectric and a liquid medium boundary where i need to enter the...
View ArticleHow to mesh very thin films/ layers in MEMS switches? How to make use of...
I want to run electromechanical simulations on MEMS double clamped structure. The problem I am facing is on meshing the thin features in the structure. The top electrode and bottom electrode are each...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View ArticleProblems generating lamb waves in an Aluminum plate
Hi, I am trying to generate lamb waves in an Aluminum Plate using a Piezoelectric actuator placed in the center of the plate. I am pretty sure that the physics involved are solid mechanics and...
View ArticleSimulating piezoresistive effect in COMSOL4.1
Hi I want to see the resistance change of a silicon beam due to piezoresistive effect when it undergoes stress on its terminals. Can anyone tell me how I can set the piezoresistive coefficient in...
View Article3D Symmetry of Model
Good afternoon all, I am modelling two electrodes (tips facing each other) and the electric field between them. There are two Z-axis layers to each of the electrodes, measured in nanometers, whereas...
View ArticleYoung's Modulus of Multilayer Cantilever
Hey! I am working on a multi stack cantilever. Any body tell me how can I calculate Young's Modulus of Multilayer cantilever? I am using 5 layers i.e. Si, SiO2,Al,ZnO,Al. Please Help.
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