DC discharge modelling query
Hello I am modelling a DC discharge in between 2 electrodes which are positioned asymmetrically. I am making use of the example model in comsol library (positive column-2d). Both models are attached in...
View Article"Failed to find solution" Error in Structural Mechanics problem
Hi, I keep running into a problem when I try to solve my model on COMSOL 4.3. The geometry is pretty simple, it's a rectangular piece of Polyethylene Naphtalate, with an array of hexagon cuts. The...
View ArticleBasic GaN TFT Simulation, Mesh error
Hi everyone, I am new in Comsol, so probably my issue will sound funny to you, however I could not solve that problem and want your help. I want to simulate a basic thin film transistor (TFT) in 3D in...
View ArticleUsing integrals over variables in the model definition
We have a 2D model involving fluid flow and transport of diluted species. The latter includes an "R term," which adds a source for the species. We would like R to be a function of the spatial position,...
View ArticlePost-processing: Calling derived values
Hi, In a rectangle (XY plane) heat is flowing in from one side which contacts an isothermal surface and flowing out from the opposite side under a temparature difference 10[K]. I need to find the total...
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 ArticleCannot compute eigenfrequency with impedance boundary condition.
Hello, When I follow an eigenfrequency tutorial to the dot, I cannot get the simulation to compute with an impedance boundary condition without the typical 'undefined stiffness matrix' error. These are...
View Article[URGENT]Problem with boundaries-Solid Mechanics?
I've been wracking my brains with this for the last few days. I keep getting a convergence error which most likely is due to an error on the boundary conditions? Attached is my file with what I have. I...
View Articlescaling of variables
What is scaling of variables and how does this influence the final solution? What should be chosen for scaling of variables from "manual, initial value based, automatic, none"? Thanks for the help....
View ArticleIterative Stationary/Time dependent procedure
Hello, Does COMSOL allow for an iterative procedure of the following type: Use a stationary solver to find the solution of the Laplace equation for a prescribed boundary data in a given 3D domain; then...
View ArticleError in plotting contact pressure.
I have a model consisting of two cylinders in contact. >> When there is penetration between the contact surface of the two cylinders (domain 1 & 2) this results to creation of a 3rd domain...
View ArticleHow to set convergence criteria?
Hi everyone, I'm working with the CFD and heat transfer modules and I'm not able to figure out how to set the convergence crtieria. I'm performing a stationary study with a relative tolerance of 0.001...
View ArticleDrift Diffusion and Heavy species transport coupling
Hello I am modelling an AC-DBD plasma actuator (model is attached). I have modeled my time-dependent ac circuit and have proceeded to include the drift diffusion model and heavy species transport...
View ArticleModelling a plasma gasifier
Dear, For my master's thesis I am modelling a plasma gasifier, without using the plasma module, but only - the heat transfer module (fluid and solid) - Fluid flow Laminar - Radiation in participating...
View ArticleConvergence problem-Dielectric Barrier discharge
Hello I am modelling an AC-DBD. I am facing convergence problem as i run my model. The error that shows up is Repeated test error failures Failed to find consistent initial values. Last time step is...
View Articletransformer simulation with AC/DC, HEAT TRANSFER
Hi everyone, I would like to simulate a three phase transformer in 3D with more module in the same time. The aim of my model is seeing the effect of the magnetic field (eddy current, leakage flux) for...
View ArticleGeometry building differently during Batch Sweeps than in individual simulations
COMSOL'ers: I have a geometry of a V-antenna which builds properly as a function of angle ("del") when simulated individually; however, when run under a batch sweep (of del) the geometry does not...
View ArticleError in convergence of coupling of two single turn coil domains.
Hello, I was trying to model the coupling of two single turn coils in Comsol 5.0 in 3D. this is same as the model in 2D presented in the model library of comsol which is named mutual-inductance. if you...
View Articleout of memory error
Hello. I have a problem. I could solve my program using my computer. But I can't solve my program after I did format my computer. All hardware and software are same. I received error message "Out of...
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