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Transport of dilute species
Respected Sir, I am working on chemical vapor deposition using transport of dilute species module.In the"flux" boundary condition i wanted to enter a non-linear rate expression--0.01*((c2)^0.5)*c where...
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Export fieldmap in a different coordinate system
Hello, I am wondering if it is possible (easily!) to export a simulated fieldmap in a coordinate system which is different from the global coordinate system (origin moved, and axes rotated). I would...
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Reaction Diffusion system
Hi everyone. I am dealing with a simple problem which involves diffusion of product species (which is produced by enzyme substrate reaction). I am not able to solve this using comsol. i was wondering...
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Transport of dilute species module
Hi, Plz help me out to know how to enter nonlinear rate expressions bcz comsol is not taking powers like 0.5 i.e c*c2^0.5. I kindly request anyone of them to give a reply soon. Thanx a lot..
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Concave Workplane / Concave Geometry
Hi, Do you know if there is a way in order to draw attached geometries in COMSOL? Or any idea if I am able to create a concave workplane? Thanks in advance.
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Transport of dilute species module
Respected Sir, I am attaching my .mph file.It is working well when a>=1.For my case a=0.5 it is showing error. Here 'a' is the power of the concentration. I kindly request you to help me out with...
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High Aspect Geometery Meshing
I am modeling heat transfer through a stainless steel plate with dimensions 6.35mm x 6.35mm x .1mm . Does a meshing function exist which would allow me to change the mesh element size on the thickness...
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Override and Contribution (boundaries) - Solid Mechanics
Hi! I just started my first project on COMSOL! pretty excited! I have a problem, that I can't seem to solve. With Solid mechanics physics, I can't make the default Free 1 with an added boundary mass to...
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rate of heat transfer
I am new in Comsol and might have a fairly simple question. How can I simulate this situation: There is a block of a material 10mm*10mm*1mm. If a part of this material with dimension of...
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help required for input functions
I am very new to cosmos. I would like introduce different time dependent boundary conditions for temperature for the model www.comsol.com/showroom/gallery/474/ So, what I would like provide is The...
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defining a surface in 2d axisymmetric
Hi, if I want to calculate the heat flux that is exchanged by the bottom and the top parts of a cylinder, how can I define the surfaces at the top and bottom in a 2d axisymmetric? by cut line 2D or Cut...
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(Solved) A problem with deformed mesh
Hi all, I am trying to solving a very simple heat transfer problem with one moving boundary due to corrosion. However, Description: 1. 2D transient heat transfer in a rectangular solid block; 2. Left...
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probe variable problem
Hi I defined a domain point probe (Temperature)and the model runs fine and I get a table of the temperature at specified times. But if I try to define a variable with an expression that includes the...
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Using the "spatial at" function to extract a value at a particular point
I need to write a COMSOL expression to extract a result value at particular spatial coordinates from one study, so that the result can be used as input to another study. I am trying to implement...
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Meshing a thin layer
We have problem meshing a 12 Micrometers layer in the attached model. Just wondering if anyone can give me some suggestion on how to mesh it. I have tried different methods (including the approaches...
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How to access materials property variable using material switch node
Hello all. I want to access materials property variable(Cp,rho etc) in physics node. When I use (nomal) material node, I can access this syntax : "comp1.mat1.def.Cp" . Then, how should I access these...
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Someone knows how to configure transport of diluted species?
Hello, someone knows how to configure transport of diluted species? I`m trying to simulate the diffusion of methanol in water. My model have two inputs and an output, microchannels. My question is i...
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Flow rate at inlet
Hi, Could someone help me to understand how the boundary conditions presented in page 5 of the following paper could be implemented in COMSOL? www.comsol.com/paper/download/43839/Smith_pres.pdf Best...
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Electricfield Streamlines
Hi! I am new to COMSOL and I have a very simple model consisting of 2 electrodes. When i try to simulate for electric field lines, using the streamline function by the magnitude controlled option i get...
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baffled mixer example
I built and solved the baffled mixer example which worked flawlessly. I am making a mistake when adapting this to the frequently performed test tube research. I followed the instructions below from the...
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