Problem with S11 parameter
I created in Comsol a resonator cavity with a feed (in the picture) that works at GPS frequency (1.57 GHz). When I try to extract S parameters I don't understand the behavior because the values are...
View Articlecylindrical resonator cavity with coaxial cable
Hi! Can anybody help me making in Comsol a cylindrical resonator cavity with coaxial cable as feed with a little extension of inner conductor to couple energy inside the cavity? I’ve tried to make it...
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticleInlet stream under an angle
Hi, I want to simulate a fluid flow that enters a room under an angle. I can't use a cylinder (which I rotated to achieve the right angle), because I am not able to use one end as an inlet and I don't...
View ArticleStudy1 is sweep of the wavelength and the consequence is used in Study 2, but...
Hello all ! I'm puzzled that how to calculate the EQE of the solar cell , I used the light(rf module) to calculate the G (sweep of the wavelength) and electrostatics1 to calculate the phi0; two...
View ArticleSave results from non converged analysis in master file when using batch sweep
Hi! I'm using a batch sweep for one parameter "R" to analys how an irregular geometry will influence the load carrying capacity of a concrete slab. For each anlysis a random geometry is generated (by...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticleInvalid field variable in property Llimitfivar
Hi, I'm new to Comsol 5.1 version and i have a problem with my simulation. Does anybody know what "Llimitfivar" is? I'm searching for it's meaning for some time and i can't find anything. I have no...
View ArticleDerived value calculation from independant (electromagnetic+solid)...
Hello I have built a 3D model of a nanostructure for which I want to calculate some coefficients that are calculated using some integrals that depend on both the electromagnetic and the displacement...
View ArticleModel Parameter Adjustment
Is there an operator I can use to determine the position where the average value of a dependent variable (of a 2D geometry) will reach a particular value? To be clearer; I have a three PDE that I am...
View Article[Solved] Error in Sweep - Invalid Property Value
Hello community, I have a problem with a file that was running fine without parametric sweep. I tried to implement the parameter sweep, but it seems I run into troubles. Here is the error message :""""...
View ArticleHelp on COMSOL Mathematics interface
Dear all, I need to solve a Poisson equation in which the right hand side (RHS) equals a function containing a conditional statement in terms of the solution itself. To summarize everything, it's the...
View ArticleProblem when simulating nanowire absorption
Hy all, I'm simulating the absorption of a nanowire in vaccum. I started with a 2D model in the RF module. My geometry is a nanowire in vacuum surrounded by cartesian air-PML. I solved the problem for...
View ArticleFar field in RF MODUL
HI I feel something is wrong in far-field calculation in RF module. Please have a look at the attached mph file. There is a simple square where an EM wave comes in from one side and exits from the...
View ArticleEvaluating graphene properties
Hi everyone, I am a new user of COMSOL. I want to evaluate magnetic properties of graphene . Input to the system being current. Can you suggest which properties of material I need to add and any...
View ArticleHelp required for modelling device in comsol using electromagnetics
Dear All, I am a new user of comsol. I want to model a device where i want to pass current in copper coil and place nanomagnets above it so that the nanomagnets start orientating according to the...
View ArticleLaminar flow and automatic remeshing on fold up edge
Hi all, I'm working with this model since a long time, but I cannot make it works fine. I'm simulating a model in which an external pressure acting on a limited area pushes on a viscous liquid that is...
View ArticleInitial values AND solution as initial condition
Hi, I've got (maybe) a very simple question, but I can't find any answer to my problem. I'm solving a two-step heat transfer problem, the first one is stationary in order to get the temperature...
View ArticleGeometry problem: connect feed to cylindrical cavity resonator
Hi! I need to connect a coaxial cable not on the two parallel face but on the straight line (as you can see in the picture). I have tried to make it with no luck because the electric fields is confined...
View Articlewhat is wrong with the ALE
(all are in the .doc attachment. Thanks) Hi,everyone, I ‘m building a simple model based on the “heat transfer” module and the “ALE” module. The geometry is a simple rectangle. In the heat transfer...
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