How to define a maximum value for a dependent variable?
I have been trying to develop a performance model for an electrochemical system. However, I got some evaluation errors of powers or logarithms when starting the solver. This is due to concentrations...
View ArticleDefining heat source correctly
I am busy modeling batteries that heat up during use, and an airflow over the batteries to cool them. Each battery produces 12W of heat, according to the manufacturer. I have simulated it as a 2D...
View Article4.3a demo: Battery capacity fade. There is an unwarranted parameter.
An interesting thing is discovered that the newly added demo "capacity fade.mph" in 4.3a was deleted in 4.3b for unkonwn reason. The capacity fade model was established by referreing to these two...
View ArticleOverpotential Definition
In the user guide for the electrochemistry branch, overpotential is often defined as the difference between electric and electrolyte potential and the reversible potential, i.e. eta = phi_s - phi_l -...
View ArticleCOMSOL version 4.4 floating potential boundary condition missing
Hi I'm running an electric currents physics study and I want to apply a floating potential boundary condition. The version 4.3 manual says it exists but I can't find it in version 4.4. What's going on?...
View ArticleSolving Nonlinear Coupled PDEs
I am trying to simulate a micro-scale model. My unit cell consists of an anode spherical particle surrounded by electrolyte material. My problem is that while the system simulates, the results do not...
View ArticleCapacity Fade Model
Hello guys, I am new to COMSOL and I was trying to plot Capacity of Lithium Ion Battery(X-axis) and Number of Cycles(Y-axis) using the Capacity Fade Model and I couldn't figure out how to do it. Any...
View ArticleSecondary current distribution
Does comsol follow SI or American sign convention for classifying local current density as anodic or cathodic (on the basis of sign). Please explain in detail.
View ArticleBattery and AC/DC Multiphysics coupling
Dear Sir, I am a research scholar from India and my research is based on two physics Li-ion and Magnetic field. Sir, I need your kind help to understand about Magnetic field. My problem is how to...
View ArticleHow to vary the magnetic field?
Dear All, In Wave Optics ----> Electromagnetic Waves I wish to study the effective refractive index variation w.r.t. variation of the magnetic field. Here, I need to know how to vary the magnetic...
View ArticleProblem about the constraint force expression
Hi, everyone I have a question about the constraint force expression in the comsol model library "Vanadium Redox Flow Battery". About the setting of Pointwise constraint, I know that in the first...
View ArticleHelp with modeling resistance in current collectors for lithium-ion
Hello, I am not sure if I am in the correct area of this forum for assistance I need. I am currently working on a model for current collectors in lithium-ion batteries. More specifically the voltage...
View Articlemodeling with extra dimension
Hello, I am just trying to set up a simulation model for electrochemistry with porous electrode, I've used a 1D interval for electrolyte concentration, but to model the solid phase diffusion in the...
View ArticlePrevious solution node
Hello, does anyone know if this solver node has some incompatibility issue with the events interface? or any other node in COMSOL? once I add this node to my solver, it gives me error on event variable...
View ArticleAdding Catalyst in Li Ion battery model
Hello, I am new to comsol 4.3a and I want to add a catalyst layer around electrodes. i would like to begin with adding catalyst layer in existing tutorial model and understand the changes to begin...
View ArticleLi-ion battery model, change current rate, does not converge
Hi all, I am new to COMSOL. Recently I am running a 2D Lithium ion battery model. This model converged at 1C (10A/m2), but aftering increase the current rate from 1C to 3C(30A/m2) this model does not...
View ArticleHow to put in series fuel cells
Hi everybody, I have builted a model based on the Comsol Battery & Fuel Cells Module/PEMFC/ht_pem example. In my model I would like to put several cells in serie, but i don't know how to do it. The...
View ArticleCURRENT INTERRUPT ANALYSIS
Hi everybody, I'm a new user in COMSOL and I have some problems to solve my model. I have built a fuel cell model and I would like to make some simulation on it to compare the results that will came up...
View Article3D Lithium Air Model
Hello everyone, I am trying to build a 3D Model of a Lithium-Air-battery based on the 1D Version from COMSOL's model library. Everytime I run the simulation i receive the following error after several...
View ArticleHow could I investigate particle size distribution of active materials in...
Hi all,Since in battery interfaces of COMSOL(Lithium ion battery) there is no option to change the radius of particles,how can I do that?
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