rf mems switch design (comsol 4.2a)
HeLLO, i'm working on designing a switch that should work on rf range. I'm able to draw 2d structure in work plane but still not able to fix one side of the cantilver beam. i hve following questions,...
View ArticleEigen frequency analysis
hi, i am dealing with a nanotube sensor...can i use eigen frequency study step to find frequency at which displacement is maximum or should i use some other study step..
View ArticleUsing a Gaussian Pulse
Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...
View ArticleState Space Export
Hi , i have build a simple cantilever beam model using time depented model. after defining the points of forces and parameters, i want to export the model to matlb (State Space Matrices) so i could...
View Article[SOLVED] Comsol v4.3.0.233 crashes
Hi, Today, after restarting my machine I opened several applications and I was logged out from my desktop session. After checking one by one, I get to see it was comsol that was giving problems. I've...
View ArticleHow to plot the relative error?
I've just spent more than a whole day troubleshooting my model. However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes. There was a problem...
View ArticleIntegral Constraint
Hi, I am using the Nernst Planck Module (chnp) on Comsol 4.3 and I want to create a constraint so the total current in a boundary it's equal to 0, but I have no idea how to do it. Can any body help me?...
View ArticleInitial values error using mapped mesh
Hello, Every time I try to use a mapped mesh for a time dependent simulation I have the following error : --- The following feature has encountered a problem : failed to find consistent initial values....
View Articlegas mixture
Hi I am trying to model an ejector with 2 inlets and one outlet. In the first inlet I have hydrogen with low pressure, in the second inlet I have (hydrogen 30% + steam 70%) with a higher pressure. The...
View ArticleOverride not-applicable boundary
Hi, This may be easy but I don't see how to do it in V4.3a. In V3.5a it was not hard. I would like to apply convective cooling at an interior boundary in my model. Currently, all the interior...
View Articleacceleration due to gravity Laminar flow
I want to give acceleration due to gravity effects to fluid in Laminar pipe flow, any one know how to give,????? I have tried by applying domain volume force like 9.81*density of fluid but i am not...
View ArticleSimulating an expanding plasma plume
Hello, There are two ways (at best of my knowledge) we can simulate the expanding plasma plume due to the irradiation from a laser on a target. 1. Particle tracing module 2. Fluid model. We are working...
View ArticleHow to set boundaries as continuity ?
I want set the boundary as a continuity but I don't know how? I know that in Comsol by default the boundaries are define as continuity and it follow this equation: n.j=0 but I want change it to n(j1-...
View ArticleFluid structure interaction with Turbulence k omega model
Hi, I want to study he effect of blood(fluid )on arteries wall layers(structure ). so i have been trying to model it with FSI and turbulence K omega. There is in inlet velocity waveform that is...
View ArticlePlasma electron impact reaction
In plasma simulation If i have the reaction Metastable –metastable associative ionization Hes+Hes=>He2++e with rate constant, k and threshold energy -18.2 where Hes is metastable Helium and He2+ ion...
View ArticleExport Image through script
I would like to be able to save an image of my plot using a script. I thought opening my script and going to export image in the GUI would add the steps to my m file but that didn't work... Thanks
View Articlemicrofluidics
hai all my geometry is a rectangular having 10mm in x direction and 1mm in y-direction. the first half ( up to x=5mm) consists of one fluid and second half consists of other fluid having same...
View ArticleWaveguide Dispersion Curve
The MATLAB coding for solving second order differential equation(D(λ)=- (λ /c)*(d^2n/d λ^2)) of wave guide dispersion is heavily needed. I have values of effective index n, c is constant and variable...
View ArticleConvergence of time dependent and linear solver
Hello All, I am trying a model in which electrodes can electrically stimulate certain layers having different conductivity (input being a biphasic pulse train). Using time dependent study, the model is...
View Articletransmission spectrum for beam focusing in plasmonics
Hi everyone Iam trying to simulate using the RF Module beam focusing through subwavelength slit using grating but unable to get transmission spectrum i hv defined two port one side it is small in width...
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