How to simulate the water boiling by Level-Set method
There is a good example simulating water boiling by phase field. I am trying to use the Level-Set method. However, I was frustrated by many times of failure. My problem is how to deal with the...
View Articlehow to understand the code of comsol in matlab editor.
how can i understand the code of programme that is developed with the help of COMSOL and saved as m file and now it is obtained in COMSOL MATLAB editor. how to get to know the curve it shows belongs to...
View ArticleDealing with Periodic Boundary Conditions, PMLs and interfaces.
Hello, I'm trying to simulate a nanoparticle array over a substrate in order to study its extinction cross-section. To do so I've made a cell with periodic boundary conditions on the sides and two PMLs...
View ArticlePrincipal stress 2d vs 3d
Hi everyone, I have the same model made in 2d and 3d. First and second pricipal stresses are similiar in both models. But third principal stress in 2d are unrealistically high, however in 3d have value...
View ArticleExtracting absorbed power
Hi all! I am currently doing a 2D model where I have an incoming power, and then I have absorption within the material. As a result, I have the value of the intensity everywhere, but I don't know how...
View Articlehi
can anyone explain to me what is geometry linearity and non linearity? what is the different between them? i'm not clear about that... thank you for advanced... :)
View Articlesolving helmholtz equation
I wish to solve Helmholtz equation for an Axi-symmetric geometry. The problem geometry consists of a excitation source a tube and air box (all rectangles). Is it possible in equation based modeling?....
View ArticleTransient Hot Wire Method
Hi Everyone! I'm new on COMSOL so I don't know too much yet. I need to simulate the transient hot wire method, I don't know how to start with, and I cannot find any example. Could somebody help me with...
View ArticleRegular Meshing
Hi all, I've been asked to create a regular mapped mesh for a cube which has faces of 10 by 10 square areas throughout the whole of the cube. I'm applying a magnetic field to the cube and I wanted to...
View ArticleHow is the penalty factor used in the penalty method?
I am modeling a transient contact problem using the penalty method instead of the augmented Lagrangian method. How does COMSOL use the penalty factor when the penalty method is being used? I understand...
View Article[solved] Call functions in 4.3a
Hi I created an interpolation fonction in the global definitions node. I need to use that function as an excitation in a bondary condition and simulate according to that interpolation. So, I put "Int1"...
View ArticleMagnetic field
Does anybody know how to write this expression on comsol ( ∇/B/^2 )? I meant expression that replace "the gradient of the magnetic field norm square". Thank you
View ArticleFailed to evaluate variable jacobian - using a step function
Hi every one, Im trying to put a BC (volumetric flow rate) in my model as a step function. But the following error occur: Failed to evaluate variable Jacobian. - Variable: step1 - Geometry: 1 - Point:...
View ArticleMax value of a field and its coordinates
Hello, I know that there have been a lot of posts about this topic and I have read many of them but I am still as dumb as before. I need to find the value of the maximum value of the field in a domain...
View ArticleUse contour plots as geometric entities
I saw in the release highlight video that in v4.3a that you can use contour plots as geometric entities. How do you do this?
View Articlestart comsol server on cluster on multiple compute nodes
Dear, I would like to run the comsol server on multiple nodes, with each 8 cores, on a linux cluster. For this I use the following command in a PBS script: comsol -nn 1 -np 8 -f ${PBS_NODEFILE} server...
View Articledialysis
Hi, I have got the attached model on dialysis process at COMSOL site. I have some questions regarding the solver. As you can see, under the "Stationary Solver 1" there are two nodes- Fully Coupled and...
View ArticlePlot of Temperatures for a Time Dependent Step
Hi, I was running a case last week that included several physics, including heat transfer. Just by chance, I looked at the computed temperatures at the end of a steady state step and again at the start...
View ArticlePiezoelectric Devices with Electrical Circuit Help
Hello - Ive been using COMSOl for about 6 months, and working with Piezoelectric devices. I recently upgraded to the ACDC module to include SPICE models with my piezo component models. I would like to...
View ArticleVariable modifications between solution iterations
I'm developing a transient model using the Livelink interface. The model first calculates an initial solution for the first time window, then I would like to modify the state variable values due to...
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