Voltage/current Source with harmonics
Hello,I want to apply a voltage or current source which is square wave and is not sinusoidal purely. How can I define it as bellow: V(t)=(V_ac)sin(2pift) + (V_ac/3)sin(2pi3ft) +...
View ArticleExport boundary condition with boundary node in mesh
I have found the mesh result could be exported from the export options, but the output does not show the boundary condition with boundary node, it only contains the element numbers and corresponding...
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Shell-Shell connection
Hi all,I'm trying to model a shell with a thin film on top, modelled with another shell. In the geometry, I just have one surface, which I use in two shell-physics. In order to couple the physics I...
View Articlemodelling of moving laser heat source
Hi, I want to model a moving laser heat source for heating a hemispherical cavity. I want to define a helical path inside the cavity for the laser heat source but i am having difficulty in defining the...
View ArticleSanity Question
Hi,I've been working on some simulations in the RF module and just need a quick sanity question answered. In order to "prepare" my simulations I first try to simulate a Air -> Dielectric substrate...
View ArticleNegative & irregular concentration with an applied concentration flux
Hi,I want to study the mass transport of diluted species under convection and diffusion. My simulations yielded a significant amount of negative concentration. Therefore I created a model for testing...
View ArticleWhat is a Pressure Point Constraint? When is it used?
My solution is not converging. The model consists of inlet and outlet pressures. I read online in such cases you can use Pressure Point constraint. But I don't know much about it. Can someone help me...
View ArticleStrange mechanical behavior in FSI
Hello,I am a student, new to COMSOL, and I'm trying to compute a fluid-structure interaction study where the sinusoidal body load applied to the mechanism induces a motion in the fluid. Everything...
View Articlesurface Acoustic Wave Gas Sensor
Sir, Iam working on MEMS based Surface Acosutic Wave gas sensor.Since this works on Mass-loading effect to know the sensor performance like sensitivity etc "resonant frequency shift" is to be...
View Articlesaw gas sensor
The below post is related to an archived discussionhow to identify resonance nad anti-resonance frequency of saw gas sensor and resonant frequency shift before and after exposure of the gas
View ArticleRequired Time to Reach A Specific Solution Value
Dear all,I am running a 1D time-dependent diffusion simulation. Is there an automated way to find the required time for a point in the domain to reach a specific concentration value? For example, I...
View ArticleSimulation of a gear pump with intermeshing sprockets
simulation of a gear pump with intermeshing sprocketsI have been trying to simulate flow in a gear pump with two intermeshing sprockets ( see the model model). I have created two rotating domains for...
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Initial values for Poisson's equation.
Hi I am trying to solve the following equation Where is the electric field in the y direction inside a capacitor and u at y=0 equals pi/60 and y=D equals -pi/60To solve the equation I am using the...
View ArticleVariable for refractive index in Ray Optics
Hello I am using glasses from the Material Library and the dispersion model for each of these glasses. I wonder if it is possible to access the refractive index for a particular wavelength or a range...
View ArticleBand gap analysis of phononic crystals
I am performing band structure analysis using eigenfrequency domain in structural mechanics physics. Can anyone suggest the expressions for kx and ky, which will be used to sweep around the eigen...
View Article3d and 2d structure of sillicon carbide mosfet
Any idea on how to build 2d and 3d structure of silicon carbide mosfet with heatsink in comsol 5.3a?
View ArticleMaterial Properties
How do I know the precise numerical value of a particular properties? For sound velocity it shows cs(T). But I want to know the precise numerical value .
View ArticleTransmission voltage response, TVR
Hi,I'm simulating a piezo-discs vibrations under water. And, I have got stuck at implementation of the TVR. Getting the error message: "Unknown function or operator. -Name: comp1.pfar ..."Tried to add...
View ArticleInverse Magnetostriction Effect
How to set the model of Inverse Magnetostriction Effect
View ArticleNo stored reaction force data
Hi, While I am computing capacitance by changing distance between plates as a parameter, I am getting a message like no reaction force data. How can I correct this? Regards Anand A...
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