Failed to find a solution. Maximum number of Newton iterations reached....
Hi, I am trying to simulate Air flow through an extraction chamber. The file is too large to be attached here.. my inlet pressure is 1 pa and outlet is about -2 pa. It is the concept of suction which...
View ArticleChanging the default equation in level set model
Hi, I was exploring Level-set method for 2 phase laminar flow and wondering if I can change the default equations according to my wish. If yes, how can I change the equation in pressure boundary...
View ArticleToneburst signal
hello, How could I create a toneburst exitation signal or a simple sinus exitation wave signal in comsol 3.5a? Thanks
View ArticleParametric sweep of geometry with particle tracing study
Hi all, I'm studying the effect of the position of an electrode (electrostatic) on the trajectory of particles flying through said geometry. I would like to achieve this with a parametric sweep of the...
View Articlesolving is not a convergence
I adopt a interface of the fluid flow and the heat transfer in the fluid to simulate the flow of the melt pool. However, computational process is not a convergence. Main faults focus on the following...
View ArticleProblems with modelling transient magnetic field
Hi, I am currently trying to model a transient magnetic field of a electromagnetic valve consisting of a moving coil and a permanent magnet fixed to the core. I have set up the geometry and the...
View ArticleCoupling between PDE and Electrostatics
Dear All, Does any one have any experience of solving a steady general form of PDE with steady electrostaics module. I am trying to solve a PDE [ Div(DuE) = 0] where D is the mobility coefficient and E...
View Articlemodelling end inductance and end resistance of an induction motor
Hi, I am trying to model end winding resistance and end inductance of an Induction motor using electric circuit interface. My model works fine and produces good results when I keep only resistance with...
View Articlecomsolbatch - log while solving
Is it possible to have a "live" feedback on the solution in batch while running? If I run this command "comsolbatch -inputfile batch_OK.mph -outputfile batch_OK_solved.mph -study std2 -batchlog...
View ArticleConvergence problem in RF module
I am doing some plasmonics simulation using silver nano particles in comsol. For silver particle convergence is either very very slow or there is no convergence in most cases for some specific...
View Articlenot converged in spite of the low error value
Hi, I'm modeling a reactor with turbulent fluid flow and heat transfer and got really confused. The Nonlinear solver reaches the error value lower than 1e-10 however the solver dose not stop the...
View ArticleCable model with point mass
Hello everyone, i modelled a prestressed cable with truss element (both tried in 2D and 3D) and used the "prestressed analysis, eigenfrequency" to obtain the natural frequencies of the system. Now i...
View ArticleMagnetic field measurement without electric current
Dear sir, I want to measure the magnetic field of simple one sided magnet whose arrangement and position from the middle sketched box will be 0.5cm which is shown in file attached(magnet position is...
View ArticleConvergence Problem
Hello Everyone! A beginner of COMSOL software calls for help. Even though it is a thorough model with simple geometry, it doesn't converge. When I add Heat Source term to the model it fails to converge...
View ArticleOne way multiphysics coupling within a transient simulation
Hello Fellow Users, I am solving two physics (fluid flow & species transport) in a transient simulation. The fluid flow is not affected by the concentration distribution. As of now, i have...
View ArticleDealing with circular variable dependency and temperature dependent thermal...
Hello, I am designing a heat exchanger in Comsol without actually modeling the fluid. I model a single channel and I am tracking fluid temperature and properties using variables. One specific example...
View ArticleUndefined Value Found
I was runing a 2D model and came up with this error.. anyone can help me?? Undefined value found. - Detail: Undefined value found in the equation residual vector. .There are 912 degrees of freedom...
View ArticleUndefined value found
I had great trouble meshing a geometry. After I refined the mesh and was finally able to mesh it, I clicked the compute button. 78 seconds later, I got this message: Undefined value found. - Detail:...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View Article"Last time step is not converged" problem - in Solid Mechanics modeling of a...
Dear all: I am studying a soft & thick cylindrical shell under inner and outer time-dependent pressure loadings. The Solid Mechanics model is 2D (annulus), with a cylindrical pore in the...
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