Out of memory during LU factorization
Hi there, I am a new member in the COMSOL community. I am trying to solve a simple 3D problem having diffusion and chemical reaction within the subdomain. However, I am getting this message "out of...
View ArticlePiezo Loading
I have a 3D piezo model and the output is currently a floating potential. This tells me the theoretical unloaded voltage gain. I'm working on possibly using a global equation of a simple ohms law...
View ArticlePlacing a finite element model into an electrical circuit in COMSOL 4.1
Hello, I have recently made the switch from COMSOL 3.5a to COMSOL 4.1, and I am currently unable to do things that I used to be able to do very easily, namely placing my 3-D model (drawn and defined in...
View ArticleMark my experimental values to the curve point in the plot window of COMSOL
Hi Everybody The purpose of my question is to compare the theoretical curve obtained on COMSOL with my experimental values on the plot window. I have a curve point on the plot window. I have a few...
View ArticleError message "Cannot import a 2D geometry into a 3D sequence." in RE
Hi! I have a 2D Reaction Engineering modell and want to add some more physics through the Synchronize with Comsol Multiphysics. I have imported my 2D geometry to the RE model. When I then import the...
View ArticleHow to Convert a 2D model Into 3d model
I want to know that how i can convert a 2D model into 3D model for simulation. -- Vineet Bansal Project Associate, NPMASS Electronic Science Department Kurukshetra University, Haryana
View ArticleTwo phase flow moving mesh + Electrostatics
Hello, I am trying to model a contact angle change by maxwell stress tensor using the moving mesh module coupled with the electrostatic (from where the electric field is calculated). The modules work...
View Article3D Poisson equation problem coupled with Nernst-Planck equation
I used coupled Electrostatics physics and Transport of Diluted Species physics to simulate this problem. The source term in Poisson equation is the difference between cations and anions. Usually, the...
View ArticleStructural Mechanics Equation System
I am trying to understand how my structural mechanics model is computing its solution. The model solves and gives me a reasonable solution. However, I don't understand how it is arriving at its answer....
View ArticleMarangoni Stirring / Phase Change: Weak Contribution Settings
Hi I have a problem with a weak contribution in a laser surface melting model: My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces...
View Articlehow to control the temperature?
hello after heating,then entering the cooling stage,when t=20s,i want to get the whole model T=20°C with temperature suddenly jumped i know the way with ANSYS,but how to set with COMSOL what should i...
View ArticleHow to mesh finer in a specific area in 3D
My model is a insulator in 3D surroundded by air, i added a small water droplet on the insulator to observe the electric field enhancement around the water droplet. So i need to focus on the small...
View Articlecouple 2D solid and 1D beam
hi, how can i couple a 1D beam and 2D solid. I want to link these on a point which is located in the same position geometrically. the beam is a cantilever.
View ArticleFailed to find a solution. The relative error (35) is greater than the...
hi, im writing this mail because im stuck with my thesis simulation. this happened when i change the value of the electrical conductivity for silicon. i change for 1.6 e-3 s/m instead 1e-12 that had...
View Articleelement quadrilateral quadratic 8 nodes
Hi! How can i to do a mesh with element quadrilateral quadratic 8 nodes? Thanks!
View ArticleHow to create the material characteristic (conductivity) as a function of...
Can somebody help us? We cannot create characteristic in COMSOL. In our model we want to use the electric field as input parameter and as output we want to obtain conductivity. Please answer as soon as...
View Articlegrating reflection & transmission spectrum
Hi, I am trying to simulate a grating structure a get the reflection & transmission spectrum of that , I have tried S-parameter but no field propagate in the structure .Is S-parameter the correct...
View ArticleSimulation filament formation Laminar two phase flow (level set)
Dear all, I wonder if someone can help me. I would like to make a simulation using the Laminar two phase flow method (level set) coupled to an electrostatic simulation (ec module). Basically the idea...
View ArticleWhy conservation of mass is violated in Comsol - Laminar flow?
The model is simple, I use rectangle as my geometry(0.1505m*0.006m) ,and chose laminar flow as my module, then assign inlet boundary condition, which is pressure boundary,10[Pa], outlet condition is...
View ArticleMetal film with subwavelength size hole: Transmmittance and reflectance study
Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...
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