Time dependent Optimization
Hi all, I have already modelled the time dependent simulation for porous media. I have two equation variables. !) for inlet in to CFD (time dependent equation with two time parameters.) 2) an another...
View ArticlePiezoresistive Beam
Does anyone here uses Piezoresitive module for modeling a piezoresistive beam? Or has any example which s/he can send for me? I am really confused about the results and I need to take a look at one...
View ArticlePML error
Hi all, Can someone point me what I do wrong? I tried to repeat Scattering from plasmonic nanosphere model, so I have Au sphere + Air domain (sphere) +PML/ABC domain (sphere). When I defining PML as...
View ArticleHow to specify infinite line currents in a 3D Magnetic Field model?
I have a Magnetic Fields model where an infinite line current induces current in a nearby passive loop. I have attached a toy model that illustrates this scenario, and image of the geometry. I define...
View ArticleError with high reaction heat
Hello, I have a problem with solving the heat balance for high reaction heat (-165 KJ/mol, math interface). If I reduce the heat production with factor 100, the simulation works, otherwise I get an...
View ArticleMoving solid particles in a laminar flow
Hello, I want to simulate moving solid particles in a laminar flow with some obstacles (vertical columns) in their way. What I want to see is that how they get trapped in the gaps between the columns...
View ArticleUsing values from the "Equation view" section as input in a Coupled Multi...
Dear All, I am doing a Multiphysics modelling on the formation of an ultrasonic standing wave field that is used to separate suspended particles in a continuous medium (a colloid). As you can see from...
View ArticleRequired power for an electronic system
Hi, I have successfully built and simulate a system in the AC/DC module. Now I want to know the power input required required to sustain the condition/reach that voltage. Is there a way I can find it...
View ArticleODE simulates magnetic hysteresis but fails to find consistent initial values
Hi During my test of COMSOL 5.2, I have confronted with a problem when simulating the hysteresis effect using ODE. I am now simulating the hysteresis effect of actuator based on a smart magnetic...
View ArticleParameter estimation
Hello, I want to determine one parameter k1, which is used over the entire domain. However, objective function values should be compared only at a boundary. According to the Optimization user manual, I...
View ArticleTime-stepping
Hi, I would like to run some simulations which use an exponential time step, and I have figured out how to set that in my "range" of solutions shown, but I was also wondering if there was a way to have...
View ArticleStiffness/Residual Vector Error - NaN/Inf findings
Hi, I am especially writing this, because there is no specific explanation I found online. I checked the BCs and other variables, but could not find any mistakes. I am working on a semiconductor device...
View ArticleHeat Generation in a Disc Brake
Hi everyone, I've got simply problem with few questions. I'm working at a heat generation in a disc brake, just like the one from Application Gallery, but more difficult, with a 3d model synchronized...
View ArticleLivelink Matlab. Running processed data back to comsol
Hello Comsol community, Is there an straight forward way to send modified meshed data back to comsol after processing it with Matlab? Let me explain. I am reading a certain variable from a domain, from...
View ArticleLiquid droplet displacement on a solid
Hello to everyone, Currently I'm working on the displacement of a liquid on a solid, my goal is to enable the liquid to move from the initial phase to the initial phase (as shown in the attached files)...
View Articlehow to change the Batch sweep output result file name
The batch sweep function in COMSOL 5.1 automatically stores the results for each parameter conbination in an new mph file. The fine name is typically composed of all the paramter names and values such...
View ArticlePredefined announced variables give zero results
Dear All, I am working on the formation of ultrasonic-standing wave using a piezoelectric device acting on a fluid domain which contains suspended particles that is surrounded by PMMA walls. I have 3...
View ArticleStep-Index Fiber Gaussian Beam
Hi! Can someone explain to me the steps in getting a Gaussian Beam for Step-Index Modelling? I can't seem to get the datas and the bell-shape graph. But I followed the simulation steps exactly. Thanks.
View ArticleVery simple cantilever pull-in voltage problem
Hi, Im having a problem trying to simulate the pull-in behavior of a cantilever. Essentially, Im following the biased_resonator_2d_model but instead of VdcSP I'm using E_est, a variable for Young...
View ArticleProblem: how to ad gas generation in EulerEuler model??
Hi everybody, I'm developing the model of an alkaline cell for electrolysis of water, thus I need to consider the generation of gas at the electrodes that gives a two-phase flow as a result. I'm...
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