Boundary conditions don't seem to hold throughout simulation
Hello!I am currently working with the microfluidics module and using the laminar two phase flow, phase-field work. For my particular case, I want to use an outlet flow (e.g. 5 μL/min) while leaving the...
View Articleheat source location
I am modling moving laser heat source having guassian profile on flat plate of 5mm3mm200microns. I have two queries 1. I am getting moving laser sorce but it moving on corner of plate. However i want...
View ArticleCalculate impedance variation
Hi,I would like to calculate impedance variation on a specified boundary based on time dependent study. The way of finding the impedance variation is to calculate elecrtical potential variation and...
View Articlerate coefficient import feature in plasma module??
Hi,I was wondering how I can efficiently import a large rate coefficient data for gaseous species (including ions and neutral species). In plasma module, it seems that I can only specify each reactions...
View Articlesimulation of a reacting pipe
Hi friends I wanna simluate a pipe that contains a crude oil in it and we inject a high pressure air. Then they react and produce heat. But i dunno how to start, i will be happy if anyone could help...
View ArticleCOMSOL with matlab always stop looping
DERA All, I use COMSOL with matlab to run my model with a for-loop (change some parameters every time) . But, when the loop time achieved about 15, it will be ended, and says my computer's memory is...
View ArticleMoving wall on outer boundary - specifying rotation
Hi everyone,I'm actually struggling to find out what's the proper way to model a 'moving wall' at a fluid-structure boundary that is in fact a rotational movement. For example, imagine a tubular...
View ArticleForm union & form assembly = multiple geometries?
Hi,I am trying to use "form union" to some parts of my geometry, while I want to use "form assembly" to other parts of it. Is this possible within the same geometry, or one geometry can take only one...
View Articlehow to model spring with variable stiffness in tension and compression
Hi . I am working on buckling of beams resting on springs.I found the spring foundation node in beams but it enables a constant stiffness. But in my case the spring has stiffness 30N/m in tension and...
View ArticleHeat transfer surface to surface radiation
Hi, I've read the document provided for the topic Sun's Radiation Effect on Two Coolers Placed Under a Parasol at...
View Articleweak form
whether the dweak form in comsol has been canceled, only the weak form can be set
View ArticleQuestion About The Application Builder
Dear all,I am running a model about pm-motor with a 2D model. I want to change some parameters of the motor, for example, the air gap in the pm-motor. However, the model I import without the...
View ArticleFilling void space in assembly
I have a welded assembly that I have imported from Creo 5 that is a water-cooled part. I want to simulate the distortion from the internal space due to the water pressure. I've tried searching for this...
View ArticleApplying constraint points for welding in assembly
I have searched info for welds, but only found info on modeling the welding process.I have a welded assembly for a water-cooled part, but not sure how to define constraints properly for the weld...
View ArticleWhy the sound intensity "acpr.I_mag" in posting is nothing?
I used the comsol pressure acoustic interface to simulate an ultrasonic cleaner, but selected the sound intensity in the post-processing results, all areas are 0, why?
View ArticlePostprocessing access to timespecific values
Hey there, I have a big issue with the following topic.I created an time dependent model which includes a few ODEs calculating the biochemical concentrations. I need a small step size to get adequat...
View ArticleHow to do add a constant magnetic field to a physical domain
I am a newcomer,and I want to ask how to add an upward magnetic field in the figure below ,Thank you
View ArticleSingularity Error
Hi.Repeated error test failures. May have reached a singularity. Time : 35489.13564466919 Last time step is not converged.How can this problem be solved?
View ArticleDifferent solvers and their influence on the obtained results
Hello!I'm currently using COMSOL for a 3D microfluidics problem and I am performing a mesh refinement study. As I am quite new on the subject, I am only using different element sizes for a default...
View ArticleUndefined variable , Failed to evaluate Jacobian of expression
Feature: Stationary Solver 1 (sol1/s1) Undefined variable.Variable: comp1.wGeometry: geom1Domain: 0 Failed to evaluate Jacobian of expression.Expression: comp1.w Failed to evaluate Jacobian of...
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