Current density and resistance in piezoelectric device
I am trying to simulate the current density in a piezoelectric device. The geometry is a simple rod with a fixed boundary (also ground boundary) and a surface load on the opposite boundary. I can...
View ArticleSurface growth and moving mesh (ale) ?
Hi, I am building a CVD growth model using the heavy species transport, much similar to the silane growth model. My geometry includes a small trench (um scale), where I deposit the material. Is it...
View Article"Error: Duplicate variable name."
I am using solid mechanics, electrostatics and moving mesh and I want to perform an Eigenfrequency Study. The solver crashes with an error message:"Error: Duplicate variable name." But I didn't find...
View ArticleHow to pass result from one module in to another module.
HI All I am working in two modules, Structural mechanics and Electrostatics. I want to pass the result of the Structural mechanics module as input in to the Electrostatic module. For example: I want to...
View ArticleHeat Transfer in Solid combined with HT Fluid: Problems
Hi dear members, Please I am working on a heat transfer case where I have to show the heat transfer in the fluid and on the mateial. the first one in fluid is done, but the latter on the solid is...
View ArticleFinding Harmonics of an IDT SAW device
Hello, I have a two-port SAW device and I would like to plot scattering parameters (mainly S12) in a frequency dependent fashion. I was having trouble integrating the RF module, so I initially tried...
View ArticleCalculating contact area
Is there any way to calculate the contact area of a contact pair within COMSOL (ie without having to post-process data in MATLAB, which I have yet to try)? I have tried surface integration and other...
View ArticleUsing geometry values in physics boundary conditions
Hi all, I have tried to look around but have not figured out a way to do this. I would like to use a geometry value (i.e. the surface area of an ellipsoid) to define the flux boundary condition through...
View ArticleHeat conduction in solids - temperature dependent heat transfer coefficient
Hi, I would like to solve a simple heat conduction in solids problem with a temperature-dependent heat transfer coefficient at one of the boundaries h(T) = 1000*(300/T)^1.3 However, the result computed...
View ArticleComsol error
Hai , I am Sathya Priya.. I have few question regarding comsol multiphysics. I am designing a single axis accelerometer in comsol, which has a cantilever attached to the proof mass as a part of my...
View ArticleSimulation Error
Hi there. I am working on effect of AC electrical field on the microelectrode. However, when I tried to compute the study (either by using stationary or frequency domain), I kept getting error message...
View ArticleUnphysical solution with ellipsoid/sphere vs. hemisphere
Having a problem with COMSOL providing unphysical solutions when I use a sphere or ellipsoid "hovering" above the bottom of a domain as opposed to a hemisphere. I have a box, and within the box is a...
View ArticleHi. whats its error?!
hi ererybody. when i run a 3D model ,the following error is shown.what should be done to solve it? thank u error:Constraint found for variables in different Segregated groups. Try to merge these groups.
View ArticleS-Parameter in Complex format in COMSOL
I have not yet been able to find how COMSOL represent complex format of S-parameters. Can anybody please provide the correct format with reference? I am wondering if it is like S11=Re(S11)+j*Im(S11) or...
View ArticleHow to incorporate varying temperature with respect to time??
As the ambient temperature varies with time, I wish to add that variation pattern of temperature in COMSOL 4.3a. Is it possible? If possible, how can I add 1. using equations 2. using excel sheet for...
View ArticlePoint Charge
Hello all I want to define point charges (lets say some circles as positive Or negative charges) in Comsol. Can anybody give me some idea how i can do this? what I have in my mind is: define a constant...
View Articledifferential equations with few variables in Comsol 4.2
Hi for all! I'm trying to simulate the heat and mass transfer process in wood during drying. I need to investigate the distribution of temperature T and moisture content U in the wood during the drying...
View ArticleUsing interpolation to define temperature-dependent material properties
Hi, I am a COMSOL beginner. Trying to added a file containing temperatures and measured material properties and then utilize an interpolation function to define the temperature-dependent material...
View ArticleHow do I make a laser on z-axis in 2D modeling?
Hi, I did 2D modeling in Electromagnetic waves, Transient mode. I wanna make a model in which the enhanced electric field is shown when a laser passes from air to nanopattern. however i don't know how...
View ArticleHow to enter the temperature that varies with time??
Due to the variation in air velocity, the external temperature varies with time. Can I know how can I input the values using an equation or an excel sheet??
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