How to develop a user defined plasticity model without programming
Hi,I want to develop a DP-Cap model in Comsol by myself without programming. The difficult thing is to solve the problem of KKT condition. In order to do that, can I just change the yield function in...
View ArticleHow to cope with the KKT condition for a plasticity or damage model without...
Hi, everyone,I want to develop a damage model in COMSOL. However, different from the built-in damage model in which the damage evolution is explicitly expressed as a function of strain, the damage in...
View ArticleError in Meshing: source and destination are not compatible
Hi,I am trying to mesh 10 unit blocks (3D), which are subdivided into 4 smaller blocks for better calculations, connected between pairs by one single rectangular block (in other words I am trying to...
View ArticleDiffraction Grating
Hi all, Can we simulate diffraction grating as shown in fig(1) and observe the diffraction order as shown in fig(2)
View ArticleImport STL and convert into solid
Hi all,I have an issue importing my stl. file (this is a model created in Fusion 360) in Comsol 5.4: I'm able to import the file, but then Comsol does not recognize it as a solid, so I cannot perform...
View ArticleInternal Call Back Error
I was doing a problem related to fluids and then I computed but it was showing internal call back error which was related to parametric sweep.Parameters: "d_by_h_ratio","0.35","re","500" The following...
View ArticleFree fluid flow inducing a movement in a porous matrix
Hi all,I'm looking to simulate a steady state system where a fluid flow is inducing a velocity on an porous matrix (see attached picture).I have managed to model a moving solid using the...
View ArticleThe pm_motor in Rotating Machinery Magnetic(rmm) with moving mesh was
Dear all, I am simulating a pm_motor in rotating machinery magnetic physics. I defined the rotor with moving mesh and defined the moving mesh with constant revolutions per time. I need to reach a...
View ArticleInversed sign in electric field of port.
Hello to allFor verification purposes I'm simulating a interface between glass and vacuum. For the port in vacuum with wave input I define my electric fields as follows:...
View ArticleAttempt to evaluate negative power of zero error
I am working on a COMSOL model of 2D axisymmetric packed bed for studying breakthrough profiles of gases. I have defined all my Overall balance, component balance, Ergun's equation and LDF model...
View ArticlePDE in Cylindrical Coordinates
The below post is related to an archived discussionHi, I want to solve poisson Boltzmann equation using General form PDE and the PB equation is dependant on r and z and I also need to normalize the...
View ArticleHow to remove lines after importing geometry
As depicted in the attached figure, I can see many lines after importing my geometry from Ansys (left side figure: ansys / right side figure: comsol). How can I remove the lines? It seems like the...
View Article3D plot with table or MATLAB data
I used COMSOL to simulate a mechanism and get the stress tensor for each element of the mesh as a function of time. So I used LiveLink for MATLAB to extract stress tensor values and calculate the...
View ArticleUser defined recombination
I am simulatinig a simple p-n junction and I included a user defined recombination mechanism to my model. And recombination rate is given a constant number (1E26(1/m^3)). However, I observed that...
View ArticleStop sweep when a probe value decreases
Hi all,I was introduced to the "stop condition" in parametric sweeps (see attached). Is it possible to make a sweep stop when a probe value for the new solution is smaller than that from the preveous...
View ArticleFNL license not validated -- "SERIAL" feature does not "exist"
I've been waiting 2 days for tech support to answer this question, so I thought maybe I could get faster help from the forum. I imported our most recent FNL license file to our license server as usual,...
View ArticleIso surface mesh export using LiveLink for MATLAB
Hello Comsol Comunity, In the team I am part of, we use comsol to make simulation of electric fields propagation, that we display using a fixed threshold: - simulation domain 100x100x100mm,...
View ArticleConvergence problem for contracting cell
Hi!I created a 2D axisymmetrical model to examine the deformation of a (stem) cell on a (polyacrylamide) gel after contraction.With previous problems (earlier post) out of the way, I now run into the...
View ArticleUsing model.save method to save as mph
I am trying to have my simulations be saved automatically under specified names as they are automatically computed in my app, but I am having trouble getting them to save under specified names.Both of...
View ArticleWhat is discretization? [linear, Quadratic, Cubic]
HelloI'm working with the wave-optics module. I noticed there is an option called discretization which is set as quadratic by default. Please, can you explain it to me and why the results change...
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