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Modeling a Sliding Constraint
I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...
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Undefined Value Found
I was runing a 2D model and came up with this error.. anyone can help me?? Undefined value found. - Detail: Undefined value found in the equation residual vector. .There are 912 degrees of freedom...
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Heaviside function simulate Acoustic emission signal
Hello, I need to apply a Heaviside function difference to simulate a Acoustic emission burst signal. Can help, how can I do this? What model should I use? I'm new working with COMSOL. Thanks, Nuno Gueiral
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Modeling a Sliding Constraint
I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...
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Change x-axis units in table plot
Hi all, I have a 3d model of diffusion from a source and am calculating surface integrals of flux over particular features in my geometry. This outputs a table of total flux vs. time point which can...
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How to integrate a table result
Hello, I have calculated surface integrals for total flux over particular features in my geometry. This outputs a table of total flux in (mol/s) vs. time points. I would like to then be able to...
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Show parameteric value on plot
I've made a model of a hi-pot test setup to visualize how the electric field changes at a discontinuity as the conductivity changes (fixed potential). I'ts working great, but now I want to make an...
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Easy way to convert a complex solid model to shell model
I am working with a complex structure with formed sheet metal and tubes. Wall thickness of ~.030" with linear dimensions on the scale of 8 to 15". Definitely a problem that would benifit from a shell...
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mesh error
Hey, I was trying to follow the PDF on comsol website ( Model ID 15) to build a model for Helmholtz coil. I followed almost all the steps except for the dimensions, so the geometry should have no...
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Sharp Fluid-Fluid Interface
I’m new to COMSOL, and I was hoping someone here would be able to help me. I am trying to model fluid displacement in a pipe. I could use the two-phase flow module, but I don’t need that level of...
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Gain Medium with Circularly polarized light in COMSOL
Dear All COMSOL follows exp(-iwt) modeling in the and hence the absorption of the material is given by imag(permittivity) >0. If I want to simulate a gain medium, is it trivial to replace the...
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heat source setting
HI;I have a question that when I using heat transfer in solid and lamina flow model to simulate heating a crucible in a silicon furnace, when I setting the heat souce desity equal:6000W/m^3, the...
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Problem on Analytic function
I want to define analytic function E, which is a function to time, t, but when I want to plot out E(t), there is always a error, which is attached. Who can help me figure out what is the problem? t...
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Comsol 4.3a Memory problem -- not using enough RAM
Hello everyone, Usually the complain is that Comsol is using too much memory, but in my case its other way round. I have a really nice machine in the lab with windows 8 server. I have Comsol version...
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Heat Transfer Problem
Hi everyone, I found my heat transfer problem is taking too long to solve even in stationary. The problem is about a pair of thin pipes embedded in soil. pipe diameter 25mm, 20m long each. There is...
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Problem with insulation...
While using the Non-Isothermal Flow (nitf) and Heat Transfer in Solids (ht), I am facing problem with insulation being allocated to the faces that are not insulated. I suppose that I am not getting...
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Clarification regarding Jacobian error
While modelling a cantilever beam with two layers using Piezoelectric devices model, I had to choose two materials. One from the same physics, i.e. PZT 5 A and the second material from a different...
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"Failed to compute elastoplastic strain variables" Help Please
Hello, I am an absolute beginner at COMSOL Multiphysics and I am trying to model the effect of the movement of soil on a steel pipeline buried in it. I have attached the model file with this post. I am...
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Properties of magnetic flux in some transformer sheets
Hello everyone, i´m trying to observe the magnetic flux density in a smal gap of some transformer sheets. So far building the model and getting results that are in consent with my experimental setup...
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"Error: Duplicate variable name."
I am using solid mechanics, electrostatics and moving mesh and I want to perform an Eigenfrequency Study. The solver crashes with an error message:"Error: Duplicate variable name." But I didn't find...
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