How to choose a particular freq？
I get 4 eigenfrequencies by the eigenfrequency study and study step, and now I want to caculator the width of the 1st and 2nd eigenfrequency（for example: freq(2)-freq(1)），but I dont know the correct...
View Articlewhat's the meaning/definition of initial magnetic susceptibility
hello! I am studying the ''non linear_magnetostriction'' model in COMSOL. I'm confused about the meaning of "initial" in "initial magnetic susceptibility", whcih is a parameter of magnetostrictive...
View Articlehow to couple two shell face? rotation component?
I know that I can define the prescribed displacement to make the two boundaries coupled in solid mechanics module. But how can I do this in shell module, specifically the rotation component?
View ArticleThermally and Hydrodynamically Fully Developed Flow
Hi, I am trying to model a thermally and hydrodynamically fully developed flow (laminar flow) in a channel. I am using the "Fully developed flow" boundary condition for the "Inlet" (hydrodynamically...
View Articlesimple test case not converging.
Hi all,I have a simple setup to understand the logic of COMSOL and FE simulation:linear elasticity, strutural mechanics interface, time-dependent study type.a block of aluminum, give a "prescribed...
View ArticleComsol 5.2 not starting on Debian
Hello there!I'm desperately trying to get Comsol 5.2 running on Endless 3.5.8 (Linux/Debian) but it won't.Can anyone help me out here? Thanks in advance, Kevin
View ArticleExcuse me, what is the difference between S parameter and S parameter, dB ？
What is the calculation formula for the two types of parameters？
View Articlerelative permittivity of gold at 900 MHz frequency
Hello all,what is the relative permittivity of gold at 900 MHz frequency?Thankyou
View ArticleImport data file from excel to Comsol
Hello,How do I import a set of data from excel to Comsol?Thanks in advance
View ArticleHow to create identity boundary pair in RMM physics
Hello,all I am simulating a pm motor in comsol Multiphysics, I use the rotating machinery magntic, I imported the dxf document. While I am defining the identity boundary pair, the source boundary and...
View Articlesavings problem
Hi Sometimes It happened to me that when I want to save some big simulation (usually 3D simulations) the savings goes really slow and it may doesn´t end and so I loose everything. Do you have any idea...
View Articlevibration plate
Hello, I want to simulate a mechanical plate that vibrates in the (vacuum, air, water), I want to have air flow inside "velocity field", and the components of V (x, y, z) . Could you guide me how I can...
View ArticleConversion relationship between TNT equivalent and explosion pressure
P0=140e6[N]*(Q/1[kg])^(2/3) "Load magnitude"Hello everyone, I am having a problem now. I don't know what kind of physical quantity 140e6 is in the formula. How did it come from? Seek answers from the...
View Article"Measure" in Matlab Livelink
How can get the length, area or volume of geometery using "Measure"(or another way) in matlab livelink?model.component('comp1').geom('geom1').measure.selection.init(2); Length =...
View ArticleUltrasonic reflections of neural dust
Hello all,I am trying to model the operation of neural dust, as described by Dongjin Seo et al: Neural DustI've set up my model with 3 components: ultrasonic transmitter, propagating medium and...
View ArticleScattering on rigid object
I simulated the acoustic scattering of a plane wave on a rigid object in free-field and computed the total pressure at one point on the object's surface. I used Comsol's acoustics module and Boundary...
View ArticleUndefined Variable
HiI am trying to model the heat transfer performance of a helix electric heating element in a packed bed with air flowing into the bed. The heating element is inside the packed bed. When I run the...
View Articlehow to make microstrip antennas behave like transmitter and receiver for...
hello all,I have 5 microstrip antennas situated in a circlular shape. That means, they are facing each other in a circluar shape. I want to make one antenna to transmit at one time while others will be...
View ArticleHow can make the shared boundaries in identity boundary pairs
Hello,all I am simulating a pm_motor in comsol Multiphysics, I use the rotating machinery magntic, I imported the dxf document. While I am defining the identity boundary pair, the source boundary and...
View ArticleNonlinear conductivity
The below post is related to an archived discussion[I am orking on ZnO arresters. I would like to know how input the non linear conductivity of the ZnO material. It is dependent on both temperature and...
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