Cyclic Voltammetry
Dear All, I am working on cyclic voltammetry on a 3-d model based on the 2-D model in the model exchange forum(www.comsol.co.in/community/exchange/203/). at lower scan rates I get the graph shown below...
View ArticleElectric double layer capacitor (EDLC)
Hi all! I am trying to develop a model to describe a EDLC. There are some papers of COMSOL developers on this topic. In the first model, a PNP (poisson - nerst plank model) is developed. The model is...
View ArticleSpecies crossover in membrane in fuel cell
I am trying to model the crossover of species across the membrane of a fuel cell. It has multispecies flowing across either side of the membrane to the cathodes and anodes. The membrane has some fixed...
View ArticleAdding an extra dimension to 1-D battery model
Hi all, I am working on modeling and simulation of Li-ion battery. My model is pseudo-2-dimensional one. So I need an extra dimension to consider diffusion equation in solid phase of porous electrode...
View Articlestop condition error: stop condition fulfilled for initial values
I am trying to build a model of a 2D li-air battery based on the 1D li-air batt tutorial. I have made it most of the way through the model until I compute, and the error appears: stop condition...
View Articleinsulated anode and cathode in solution
Hi, I have created a 3D model in which I have an insulated anode and insulated cathode in an electrolytic aqueous solution with a known conductivity. Because the anode and cathode are insulated they...
View ArticleConstraint Force Expression
Hi, I want to ask what is meant by constraint force expression. In Vanadium Redox flow battery and electrodialysis models, the constraint force expression is set to be a test function, what does this...
View Articleoverall conductivity of the system
Hi, experts! I am novice and want to ask: Is it possible to calculate overall conductivity of the composite containing high conductive nanoparticles in almost non-conductive media? If yes, which...
View ArticleDiscussion on "Maxwell-Stefan Diffusion in a Fuel Cell Unit Cell"
I have performed the model "Maxwell-Stefan Diffusion in a Fuel Cell Unit Cell", and got some questions here: 1) The model defined some boundaries to be insulation, but the author has not stated it...
View ArticleDefining a variable limited only for the boundary
Can we define a dependent variable for a physics which is only valid for particular boundary and not for the whole domain?
View ArticleCustomizing darcy law physics for extended equations solving
Hi, I want to use an equation which is an extended form darcy law to calculate the velocity in the membrane of a cell. The equation are in attached jpg file. I don't know which physics to use. Can...
View ArticlePN optical modulator
Hello, I am a student in TUD and I have started to work with COMSOL. My task is to model and simulate PN silicon optical modulator. I am using Semiconductor module. I have couple of questions I would...
View ArticleCurrent density in 1D Li-air battery module
Hi all, I have a question about this model. This model is 1-dimension. However, the unit of current density is mA/cm2. I don't know how I can understand this current density. Also, how do I assume the...
View ArticleSolving coupled PDE's in COMSOL 5.2
Hi! Is there any way to solve coupled PDE's without using the Coefficient form PDE? I am not able to fit in my equations using that module. Also, How can i custom add boundary conditions(I am not able...
View ArticleTransient discharge simulation of a diffusion-limited
Hallo, I am the beginner of COMSOL software. Recently, I have a problem on doing transient discharge simulation of a diffusion-limited solid state cell. I used Electrostatics and Transport of Diluted...
View ArticleTime-Dependent Heat Transfer
Hi, I am trying to simulate heating a block of metal in a furnace, and have chosen to use a time-dependent external temperature (by creating a piecewise function for T(t) ), to simulate a furnace...
View ArticleElectric Field dependant Equation entry in COMSOL 5.2
If I want to express that the conductivity of the material depends on the Electric Field in Y direction (Ey). How should I write Ey in the equation in this case. I want to know how I can make realize...
View Articleerror when adding a velocity field to v flow battery model
Hi , I am new to Comsol. Recently, I am trying to build a vanadium flow battery model. I found the v flow model in model libraries is very useful. The model is too simple and I wanna add more to the...
View Articleinitial Value for electrolyte and electrode
I want to ask question about initial Value for electrolyte and electrode. I read the manual, it is said that ''Use this node to specify the Initial Values of the electrolyte potential and the electric...
View ArticleCurrent Source of electrolyte and electrode
I want to ask one simple question of current source, siec.Qsi and siec.Qli. For one domain, what is the direction of current when the value of current source is positive? Does current go into the...
View Article
