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Magnetization along the short axis of a magnet
Hi! I am trying to simulate demagnetization of magnets in a rotor of an electric motor using the MF module. The magnets are supposed to be magnetized along their short axis, but it gives me the...
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Acceleration on Cantilever
Would you guys please suggest me how can I apply Acceleration on PZT Cantilever? I want to calculate Output voltage
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Defining a variable limited only for the boundary
Can we define a dependent variable for a physics which is only valid for particular boundary and not for the whole domain?
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How to add a static current in Electromagnetic wave transient study
Hi, I am working on a problem using electromagnetic waves transient module. I want to study the interaction between incident EM waves and an annulus conductor in which a static current is flowing on...
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How to make a interface boundary?
Hello I am doing a evaporative cooling project. I have two domain (see the figure). One is for air, another is for water. Problem is, when I try to give flux at the interface boundary, comsol is...
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Exporting data while solving
Hi, I am relatively new to COMSOL. Is there anyway to write the data generated up to a point while solving into an external file like excel or .txt which can be opened in COMSOL at a later point of...
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Form assembly or Form union
Dear All, I encountered a problem when I models fluid flow through conduit surrounded by solids at two sides. The models involves laminar flow module and structure module. According to the description...
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What causes a model to converge at one frequency, but not at another?
I have created a coil and am running it at different turn number and frequencies to verify that the model is outputting correct inductance. Using "magnetic and electric fields" (mef) and a frequency...
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How to add a mass source term to NS equation
Hello everyone I have a problem in adding a mass source term to the NS equation. I use it to account the mass loss due to vaporization during laser melting process. Currently I use the interface moving...
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Thermal Expansion Polycrystalline Silicon
Hello, I was trying to find a similar problem to mine but could not find it. I am trying to find the stress gradient of a poly crystalline thin film layer deposited on silica and single crystal...
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Fracture Propagation in Comsol
Hi everyone, Can I use Comsol to simulate Physics relating about: + Fracture initation + Fracture Propagation I have been searching for examples about this , even on Facebook but could not find...
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calculate the gradient of solid.pm
the result of d(solid.pm,z) is zero,how can I get the gradient of solid.pm
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Matrix has zero on diagonal
I have to solve a lid driven cavity (laminar flow) + melting problem (heat transfer in fluids and solids with moving mesh). I was able to successfully implement this in 2D. I have now shifted to a 3D...
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Quality of deformed elements
Dear all, I have a question about models that use solid mechanics and experience large deformations. Imagine a 2D square heavily compressed, for example. To my understanding, at the end of the...
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Problem when importing .dxf file
Hi When importing a .dxf file I get 100 warnings ( face to face inconsistency) and I have the following problem with domains: after forming an assembly, I want to add material on my domains....
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how to get the iv graph? final year project about geometrical analysis of...
Someone please help me with my final year project about geometrical analysis of silicon solar cell using comsol. i couldnt get the iv graph... and i need to vary parameter, change the material and the...
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Evaluating more than one expression in Global Evaluation?
Hi Is it possible to evaluate more than one expression in Global Evaluation, in one step? My goal in this postprocessing step is to tabulate and plot a variable for different mesh sizes (i.e. from...
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Normal and Shear stress
I have a vibrating structure, and using eigenfrequency analysis to get the natural frequency. I want to evaluate the normal stress and shear stress along the clamped edge (please refer to the figure)....
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Laser Drilling of Ti6Al4V using Nd:YAG pulsed Laser
I am new and a beginner to COMSOL. For my research work I have performed laser drilling of Titanium alloys using Nd:YAG pulsed Laser. Now, I need to develop a numerical model to analysis the laser...
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How to plot deformation due to heat flux
Hello everyone. I currently have a model where I have a significant heat flux through one side of a block(Si/Cu) and I would like to see how the structure of the block changes due to this heat flux. In...
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