Cross diffusion coefficients in coefficient form PDE interfaces
Hello,I'm curently working on some numerical simulations with a two-variable PDE system shown in the attachment.The last terms in both functions are the second order Taylor expansion terms. A and B are...
View ArticleMoving the Support over a cantilever
I am working on a Thermo-Mechanical problem. I have a cantilever kind of 2d domain, which is fixed at one end. I have done the Thermal part where the Temperature at the edge is moving down with a...
View ArticlePassing location and velocity of particle from external MATLAB function back...
The below post is related to an archived discussion[start here] Hello, I am using COMSOL version 5.5 on Windows 10.I have an external MATLAB function to calculate the velocity of a particle after it...
View ArticleGeometry sequence rectangular oven
Hello ! I want to model a rectangular 3D oven . I want to put 4 cylindrical inlet and 4 cylindrical outlet on the same face ! but I don't know what is the geometry sequence to do it !!!!!! Thanks in...
View Articlelshell，Derived Values,compute lshell.eXX
For example, evaluate lshell.eXX in the Derived Value, but remind me not to define the expression, data set selection, multi-layer material.
View ArticleCut Line 3D Step Size
Hey guys,I'm new to COMSOL and am using the Structural Mechanics module for a undergrad physics research project this summer. I've applied a Cut Line 3D to the axial center of a cantilever, and I'm...
View ArticleUpdate solution in LiveLink for MATLAB
Hi!I'm currently developing a model using LiveLink for MATLAB, but I've run into some trouble. After I have solved my model, I need to extract the solution (the electric field) to compute the...
View ArticleRunning Cluster Sweep from the command line on several nodes
I want to use Cluster Sweep with setting After Sweep / Output to file. When I use the following command:comsol batch -batch off -inputfile model.mph -batchlog model.logit computes all six cases defined...
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Mesh Cell Dimensions
Hi all,I am trying to calculate the conductivity at each point along the length of a semiconductor using the equation:But my question is how can I find the individual L (x dimension) of a cell from my...
View Articlemodel.component() undefined for v5.2 with JavaSE1.7
I'm trying to work with a collaborator using v5.5 and when importing his code via eclipse/JAVA I get errors on all the model.component() lines in eclipse.The method component() is undefined for the...
View ArticlePrestressed frequency analysis is not supported in Beam interface
Hi,when I analyze a shell-truss-beam coupling system by 5.5 version, a error always appearred as 'Prestressed frequency analysis is not supported in Beam interface'. but if I use 5.4 version to analyze...
View ArticleSolving two coupled 1D governing equations
Hello, I want to solve two coupled 1D governing equations for solute transport in a fracture-matrix system. The equations are written in the attached document. I know that this problem can be sovled by...
View ArticleLinear motion of a magnet moving around a coil in 3D
The below post is related to an archived discussionWhen modelling the linear motion of a magnet around a coil or other ferromagnetic materials in 3D, it seems that (1) moving mesh is requred for large...
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I would like to modify the default equations in the semiconductor module
I am planning to modify the default drift-diffusion equations under the Semiconductor Material Model. Also, I would like to add a new equation related to exciton concentration into the simulation.Here...
View ArticleProblem with Loading and Vibration Response of Stacked Plates
I want to test various loading conditions and the vibration response of a metal plate on top of a rubber pad. I have set up a model with the following conditions, but it produces errors and fails to...
View ArticlePeeling Test
Hello all,I want to compare my experimental data with the simulation in COMSOL, so I used the Cohesive model as reference. However, it produces error and fails to find a solution.Overall Setup: * 3D...
View ArticleGet specific time
I am running a time-dependent model using a kappa-epsilon turbulent model. There is a convergence reached in the segregated solver plot by fluid (velocity and pressure variables) and the turbulence...
View ArticleStationary and Time Dependent giving different solutions?
I've successfully modelled a transport of coupled dilute species, electrostatics and deformed geometry problem in 1D and I'm now trying increase it to 2D. I'm having an issue with concentrations going...
View ArticleAverage pressure at the meniscus
Hello, I am new to comsol and working on the capillary flow using Lamiar flow phase field method. Is it possible to calculate the average pressure at the meniscus exactly. Meniscus is an isosurface...
View ArticleMuscle-Tendon Interface
Hello everyone,We are trying to model the material properties (elastic modulus, density, etc.) as they shift from tendon to muscle to bone. We are aware of using analytical, interpolated, or piecewise...
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