error test failures
hi i use ccp module for simulation,my time range is range(0,5e-5,0.001) but when i compute model times go 7.579247e-019 to this and report this error Repeated error test failures. May have reached a...
View Articlefinite volume, volume of fluid, boundary integral method
Hello, I'm trying to model a cavitation air-bubble in water under ultrasound waves. For that I need to use a Boundary integral method to solve the Laplace equation. The finite element method I try to...
View Articleminimum time step
Hi all, I am stuck at trying to choose correct solver options/properties for my model. I am working on H-formulation in Time-dependent case. I cannot find an option where I can set minimum time step...
View Articledeformed geometry for Electromagnets
hi every one , i defined a moving armature by using deformed geometry in AD\DC module .also auto Remeshing defined .when the distortion exceed from 1 ,comsol remesh geometry again . but after three...
View Article"Undefined value found in the equation residual vector" error in...
Hi everyone, I try to calculate bipolar_transistor.mph example from COMSOL library models. After sucsesful finishing study "V_B sweep, V_CE=0.5 V, V_E=0 V" I run Compute command for study "V_CE sweep,...
View ArticleEditing Parametric Sweeps
Hi all, I created this model to test the effectiveness of AntiReflective Coatings. I wanted to modify this so that it can check results over a wide variety of wavelengths as well as angles. Can anyone...
View ArticleBAW Resonator Mesh
Hai I am designing a AlN BAW resonator operating at 3GHz. It is being observed that the frequency response changes widely with the mesh density. The mesh criteria of the mesh size being between...
View Article3D Model of "Voltage Induced in a Coil by a Moving Magnet"
Hi I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library. I used the same physics, materials and boundary conditions, but...
View ArticleParametric Sweep versus Parameter
I want to make a sequence of plots and/or movie, with a variable changing, but my model is not a function of this variable. For example I want surface plots of emw.Ex*cos(theta)+emw.Ey*sin(theta) for...
View ArticleImposing pumping well in 2D model
Hi comsolers, I want to impose pumping well in 2D model NOT 2D axisymmetric . Is there any way to impose well, if yes which boundary condition should I define that comsol knows that in my model I have...
View ArticleCalculation time
Hello, I developed a model which simulate the trajectories of atmospheric particles in an electrostatic precipitator. In order to optimize the collection efficiency, I plan to run the model by changing...
View ArticleMWP combined with DC
Dear Daniel, I am geting tired of comsoling... because I do not know anymore what I can do to make my models converge. i started with the waveguide microwave plasma from the model-library. I put some...
View ArticleExpanding the Capacity Fade tutorial model - Convergence issues
Hello, I've been working with the Capacity Fade lithium ion tutorial model, and I've been trying to expand the parametric study from the default 1-10 cycles to a maximum of 30 cycles. I usually end up...
View ArticleParameter as function of time in time dependent simulation
How do i specify a parameter which is function of time in a time dependent simulation ?? in my case one of the parameter is function of time
View ArticleConvergence versus meshing granularity
I have noticed interesting behaviour in my models. If the model will solve using a coarser mesh, it may not solve well using a finer mesh. And although use of the boundary layer tool can reduce the...
View Articlehow to write stop condition in time dependent study?
Hi i am doing particle tracing, in time dependent study, how to write stop condition, like i need the study stops when the number of particle passes through the outlet is over 100 , thanks!
View ArticleComsol ignores second step in the same Study and solves only first step
Hi all! I want to solve my model using several steps in the same study. First step is supposed to solve from t=0 to t =1s and second step is supposed solve from t=1 to t=100s. Both steps are using the...
View ArticleLorentz force calculation and implementation
I have got a clamped-clamped beam, with a DC current flowing through. If the beam is surrounded by a DC magnetic flux density (orthogonal to the direction of the current flow), a Lorentz Force arises...
View ArticleHow to couple shear stress and moving velocity on the same wall?
Hi everyone! I am trying to add a shear stress boundary condition on a growing bubble wall, which should be a moving wall boundary condition. I used to add shear stress on a fix wall by slip wall...
View Article2D-axis symmetry, 3D no symmetry not possible to calculate due to limited...
Dear all, I have a situation were I need to simulate a kind of tube with a pressure inside, the target is to calculate the displacement of the tube due to the pressure. Reinforcements are needed and...
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