Mesh problem
Hello, NEW TO COMSOL. I had a 2D geometry and I changed it to 3D geometry. Now, I have found some problems with meshing and I couldn't use physics-controlled mesh. The errors are as follow: Failed to...
View ArticleUnknown Function or Operator
Hi guys,When I run study-get initial value, COMSOL comes out: Unknown function or operator. - Name: comp1.semi.gdm1.genext1What I have did is definingthree parameters named Ve, Vd, Vc in Global...
View ArticleRelated to use of physics
We are putting a micro cantilever (Silicon material) of a fixed dimension inside a box and within the box we need to fill with SF6 gas. We are doing it by changing the permittivity of material 2 in...
View ArticleSingular matrix
Hello everybody I had a 2D model and I changed it into 3D. My 2D model works well, but this 3D has an error: singular matrix. Can you help me?
View ArticleMeshing very thin layers in nm
Hi All,I am trying to simulate a structure having 1cmx500 um of silicon over which 100 nm of dielectric (SiO2) is placed. I am unable to mesh such a thin layer of dielectric.Can anyone give some inputs...
View ArticleModeling of sample contamination and heat transfer in cryogenics vacuum chamber
Hi, guys, I am modeling a sample of 100K transferred in ambient air, I want to know the water crystalized on the sample also the heat transfer process of my sample. How should I model the ambient air...
View ArticleProblems with importing Solidworks Parts to COMSOL
Hello All, I am trying to import a 3-D sketch part into COMSOL v. 5.2a but COMSOL says that the file is not compatible. My only option is to import as a mesh file. So, if anyone else has had this...
View ArticleIssue: Deformation due to cooling
Hello, I am trying to model deformation caused by cooling in Aluminium rod with fixed boundary condition on either side. Its initial temperature is 300 K and final temperature is 10 mK. But i am not...
View ArticleCan I forcibly change values of variables during simulations?
Dear all,In COMSOL, can we set values of variables during time dependent simulation forcibly?Nakamura
View ArticleHow to plot Electrical Resistance vs Temperature for any design using COMSOL
Is there a way to find the effect of heating and thermal expansion of a structure on the electrical properties? Can we plot Electrical Resistance vs Temperature Curve on COMSOL?
View ArticleQuestions about iteration number of optimization module in 5.3
Hi Folks! I need a help please.I am wondering which variable decribes the iteration number of optimization ? I am using MMA and I want to change some variables as the iteration number changes.Thanks...
View ArticleImport an input stress-strain initial state from Abaqus to Comsol
Dear all I was wondering if it would be possible to import the deformed mesh/geometry and an input file with the stress-strain data after a solid mechanics analysis made in ABAQUS to define an initial...
View ArticleBatch export 3D plots of multiple mode shapes
Hi,I'm using COMSOL 5.2 with the Structural Mechanics module to calculate eigenfrequencies and eigenmode shapes of a nanobeam design. I would like to export a 3D visualization of all the mode shapes...
View ArticleTransfer Impedance of a Perforate
hi, I try to apply the example of (Transfer Impedance of a Perforate) on figure below. I drew the geometry but do not know how to apply the physisc.. if any one can help me...Thanks
View ArticleHow to efficiently output the resulting plots from a parametric sweep?
Comsol v5.3aI have a parametric sweep solution from two varied parameters (viscosity and inflow) for a stationary fluid simulation. When I generate my reports, it only generates the plots for the...
View ArticleWeak constraint in PDE for linear solid mechanics
Hi,I am currently doing my PhD studies and I have a problem understanding the weak constraint/weak contribution in the Weak Form PDE toolbox. I'm trying to implement an RVE (Representative Volume...
View ArticleHow to perform operation on far-field pressure plots.
Hello everyone,I've been looking into this for a while, but can't figure out how to do the following.I have a transdcuer in an air sphere with a PML and I want to calculate the pressure and the phase...
View ArticlePN Junction In Thermal Equilibrium
Hello, I am trying to model PN junction in thermal equilibrium with the help of transported of dilute species and Electrostatics model, where I am trying to simulate the model for drift and diffusion,...
View ArticleEMW Lumped element issue
I am designing a microwave lumped element resonator which is contained in a metal box. My simulations consists of the resonator with PEC BCs simulating the metal of the resonator as well as the limits...
View ArticleReal metal contacts to semiconductor components in model
Hello,Let me preface this question by adding that I am a relatively novice user of COMSOL.I am working on modelling a micron-scale device with both semiconductor and metal components. The goal is a...
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