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Plot of parametric sweep results for a single time
I'm simulating time-dependent laser heating of an object. I plot the temperature vs time at a point probe. Everything is well up to this point. Then I have added a parametric sweep varying the laser...
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Meshing error when changing length of model - Internal error in boundary...
Hello, I'm using microfluidics to model a 3-layer device - when the device is 10mm in length, the physics-controlled mesh works fine, but when I lengthen the device (which I need to be able to do), I...
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Introduction of BEM solver for Acoustics
Hello, I see from the recent presentation by Mads J. Herring Jensen at the COMSOL conference in Boston in October (uk.comsol.com/paper/download/257851/jensen_presentation.pdf) that there is an...
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why is calculated initial value always different from specified one.
Dear All, I faced one problem in comsol. I specified one non zero initial value for a time dependent physics(tds). after solving, in post processing step, When I plot the average value of dependent...
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How is compliance tensor calculated in comsol for isotropic materials?
I have been working on a piezoelectric cantilever. At some point I wanted to see what would be the difference if the piezoelectric material was considered isotropic regarding his compliance matrix...
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Coupling problem and LU factorization error
Hi, I am modelling electrostatically actuated switch in Comsol 4.3. For this, I am coupling electrostatic+ moving mesh + solid mechanics physics. I have to find displacement in plate due to the applied...
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Vectors with random orientation
Hey guys, I'm interested to generate random vectors for the initial condition of my 3D model which is basically for solving time-dependent PDEs. The problem is the components of these vectors are...
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Comsol advice
High guys. I am new to Comsol and was wondering if a comsol simulation will be able to give me the induced voltage on a conductor placed in an external electric field.
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Absolute Value of Temperature at Discrete Time Periods
I am performing an eigenfrequency analysis and I want to find the absolute value of temperature (T) at each given phase of the oscillation. When I use the expression abs(T) COMSOL creates a profile...
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Permeability
Hi I'm modeling a laminated core with COMSOL 4.3 in 2D. I have defined the permeability of the steel with a BH curve. My model is working pretty good as we expected. I can plot the B and H on any...
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Torque through Maxwell Stress Tensor
Dear all: Recently I tried to implement a similar problem to the one presented in the following poster. The goal is to obtain the force and the torque over a particle that is illuminated by an...
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defining function depending on 3D spacial coordinate vector and time
Hello, I am quite new to Comsol, and I would like to create a function depending on the 3D position in the coordinate system of my geometry and the time. It would create a space and time dependent...
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Modeling Magnetostriction - mod1.Azy variable
Hello I'm modeling magnetostriction in a laminated core in 2D. I have studied the '''non linear_magnetostriction'' model in COMSOL and have compare my model with that. In my model everything looks...
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Selection with name
Hi, I am a new student to start COMSOL. I have some questions in selection domains: When I import a model and try to follow the description, I need to select the right object, but I need to try one...
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Step function for battery module
Hello. I would like to create a discharge and charge cycle by using a step function. It is for Li-ion battery. I've managed to create only one pulse by define equation for discharge and charge:...
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Eigen Frequency
Dear all, I am working in solid part and trying to get Eigen frequency for a cylinder.I need to get frequency in weather,water and in oil.when i use sweep in a special range of frequencies the result...
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Problems modelling a microstrip resonator
Hi there, I am trying to model a microstrip resonator with COMSOL and I am having some problems with it since it's the first time I use this software. Basically I followed the steps on the example "...
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What is "Thickness" in a 2D model?
Hey all, In the piezoelectric transducer (pzd) and structure mechanics (solid) physics, there is a "thickness" box in one of their trees. I already draw the thickness of my domains in the geometry. I...
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Challenges of matching the results of 2D axisymmetric and 3D for a cylinder
Hello everyone: I am modeling the transport of diluted species in a cylinder in 2D axisymmetric and 3D domain. I could not match the simulation results of the 3D model with that of the 2D axisymmetric....
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Comsol advice
High guys. I am new to Comsol and was wondering if a comsol simulation will be able to give me the induced voltage on a conductor placed in an external electric field.
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