Installation new COMSOL Multiphysics 5.4
Help me. I installed a new version COMSOL Multiphysics 5.4. When I load, I get such error2018-10-09T21: 23: 11.166 + 03: 00 Using locale: en_US 2018-10-09T21: 23: 11.343 + 03: 00 Failed to load the...
View ArticleRotating steel fiber with magnetic field inside fluid
Dear All,I have modeled a Helmholtz coil in comsol. Now, I want to rotate a steel fiber (Cylinder) using magnetic flux density. However, I get error regarding my solution convergence. I have tried...
View ArticleThicken non-closed mesh
Hello,Im trying to import the geomtry of a gyroide into comsol. For this purpos I generate the surface of the gyrode with 'MathMod' and export it as an .stl file with the help of 'meshLab'.I'm able to...
View ArticleHow Linear Extrusion map the data from source to destination?
Hi,I want to use Linear Extrusion to map the data from Wave Optics (2D, ewfd, Mode Analysis) to a parameter in structrual mechanics (3D, solid mechanics, frequency domain). Specifically, I need to map...
View ArticleEquation of state in COMSOL
Hello I am trying to do a momentum and species conservation of mixing of two gases, one or both of them might be at supercritical condition. In that case I can not use ideal gas law. I need to...
View ArticleCoupling between optical fiber 3D-postprocessing
The below post is related to an archived discussionHi All,I have build fiber coupler in 3D. And I used Port 1, 2, 3 and 4 as it is described in directional coupler tutorial. In results, under the 3D...
View ArticleHow to solve the problem (Mesh warning (size) :The physics controlled mesh...
How to solve the problem (Mesh warning (size) :The physics controlled mesh became empty?
View ArticleCall a MATLAB function
Hello every body,I wrote a MATLAB fucntion for a spline curve and it worked fine in MATLAB. When calling the function to COMSOL, it gives the following error:''Incorrect size of returned vector. 126...
View ArticleError message when downloading
Does anyone know what is going wrong? I've downloaded the license file, but when i want to install COMSOL it give this error message:License file does not support this version. Feature: SERIAL...
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Characteristic impedance or Lumped port impedance
Hello,There are some parameters in Comsol RF module which are unclear to me.To understand this question I created a very simple example: - coaxial cable of 50 Ohm impedance, perfect electric conductor,...
View ArticleI have created Impulse on COMSOL 5.3a but I cannot get it right
I would like to have a chopped impluse or and modifcation that would make the tail of my current impluse to lead to zero. As known, my current impulse represent the earlier impluse but what it is...
View ArticleCOMSOL if statement
I am trying to plot an arrow surface plot where the resulting arrows depend on where they are located in the geometry.if (distance from xo,yo to x,y is less than r)/squareroot(absolute(x-xo)^2 +...
View ArticlePulsed laser heating with reflection
Hi! This has been asked severel times here and has never been answered. I want to pulse a Laser with known wavelength, known power, and known standard deviation in its intensity on a surface (Matter in...
View Articleoptical tweezer
Hello, I would like to ask you some questions about optical tweezers. With ray optics module or wave optics module? How do you analyze the forces? I hope to discuss with you.
View Articleexpression dT/dt
Hey, i want to plot the derivation of the temperature and time (dT/dt) at a specific point over the time. If I enter the expression "d(T,t)" I get the error "Time derivative only allowed with respect...
View ArticleElectric spark Simulation
i need to know what physics is used to simulate electric spark in between two surfaces? and how to define a air mixture?
View ArticleT-shape micromixer
Hello everyone,I am trying to simulate T-shaped micromixer from a previously published paper, I think I used the correct physics models (Laminar flow and transport diluted species). In the paper,...
View ArticleTemperature, Humidity, pressure in my AC/DC model . How ?
I am modeling a testing of breakdown voltage. I need to consider the Temperature, Humidity, pressure in my AC/DC model. I have already found the local properties and I insert the values but there is no...
View Articlesome questions about boundary conduction Flux/Source
Hello everyone, I have some questions about boundary conduction Flux/Source in 1D problem. Flux/Source boundary conduction is written as '-n(-c.gradient u-a.u-r)=g-q.u' or as the picture attached...
View ArticleSnap to GRID?
Hello,most of the time, when I import designs from an *.stp files into COMSOL, the resulting domain does not have round coordinates, or corrdinates with 1 or 2 numbers after the comma. I found...
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