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Temperature effect in Electrostatic module.
Hi, I am using Comsol ver 3.5a. Can anyone guide me that how could i observe the effect of temperature on capacitance value in Electrostatic module ? From where i can change/control the temperature in...
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2D magnetic field streamline plot from cut plane
Hi, I have a question on the streamline plot. I have build the 3D emf model on 6 parallel bar with the same current density. bar cross section was in YZ plane The 3D streamline could be clearly seen....
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how to define Heat source?
Hi, I use COMSOL to simulate a microheater to heat the polymer waveguide on Silicon substrate. The model is 2D. Silicon substrate serve as the heat sink at 25 degrees. When I set the microheater to 300...
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geometry problems
Hi all, My question is, if you build up a block first, then you build up a sphere inside the block. Is it means that the volume which was belonged to the block is taken by the sphere? If so, is it...
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Global constraint
Hi, I am modelling thermodiffusion of moisture with the mathematical module. Is it possible impose a constraint to the concentration, c, in order to ensure it stays positive.
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Assigning material properties to an interior volume
I want to assign the empty volume within a closed container to be a fluid and assign material propertied to this fluid. I imported a closed 3D model that is made up of a number of solid parts contained...
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Modulated sinusoidal excitation
Hi everybody, I have to simulate a piezo transducer. The excitation of ceramics is a modulated sinusoidal excitation with an amplitude of 110V. In Piezdoelectric Devices module, I just can set a...
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hill plasticity
Hi, Trying to make hill plasticity non-symmetric so my question is; is it possible with different yield stress level in tension and compression. Then in addition the plastic stage is confusion. How are...
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How to display "Cut Point 3D" data sets?
Hi there, I want to simulate and visualize discrete measurement points which I import from another application as distinguished "Point" objects in the geometry of my 3D-model. So far I've created a...
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External U vs. I
Hello, I'm quite new to COMSOL. I generally have doubts where to use external U vs. I or external I vs. U when I want to insert my designed model into a circuit. I think in any of those cases I have to...
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Mesh continuity at boundaries
Hello, I'm starting with Comsol, and I have this question, that may sound really basic to many of you. I have defined a contact pair between two parts of my geometry - an assembly. Now I would like to...
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Modeling a complex structure
The structure I'm modeling is very complex. it's a double layer structure with one wrapped outside the other. The structure is on nanoscale, so the mesh has to be really really fine. Due to the...
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minimum time value under condition
Hi I have a problem on my simulation I have a time dependent simulation and I want to get the minimum time value when a phenomena occur ( The voltage V raise a value above a certain threshlod) I want...
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Lift and Drag coefficients - 2D stationary turbulent k-epsilon flow
Hello, I am starting with COMSOL, and I have made a 2D flow simulation around a multi-element airfoil for a project at school. I used a turbulent k-epsilon flow for my model. After reading multiple...
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Plotting the mesh of a cut plane through a 3D model
Hey guys, So i am currently doing some simulation involving parallel plate capacitors and i just want to see the difference between the meshes outside and within the capacitor. I've tried to create a...
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solution does not converge when using more intensive mesh
Dear: I am making a 2d model about laminar flow around a plane. When I use better mesh, the solution does not converge. It works quite well using not so intensive mesh. Can anybody explain this to me...
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Excavation process - time dependent
Hi, I am trying to model a real-time excavation of a borehole. Assuming that at the time t = 0, the drilling begins and at time t = 1 day, the tunnel advancement is 1 m (drilling velocity = 1m/day)....
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[Batch Run on Linux Cluster Problem]
Hello, I am currently trying to run COMSOL/4.3a in batch mode on our university cluster. I am able to submit the job and pull it back after computation. However, although the size of the *.mph has...
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How to 'fill' the space between two parametric curves.
Good morning, I'm trying to make an S shape drawing to my model that consists in two rectangles and 4 parametric curves ( forming 2 semi-circles). But when I make the extrusion the parametric part of...
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How to make sure AC/DC and Structural models are coupled? SIMULATION ATTACHED
I'm doing my thesis on the magneto-mechanical coupled analysis. The attached file is only a simple example showing what I want to do about magneto-mechanical coupling. I chose to use the AC/DC model,...
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