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Diffusion in two layers!
Hi, I am pretty new on Multiphysics. I want to make a solid sphere with two layers. I want to calculate the mass uptake in the inner layer (from origo to the border between the layers). As a first...
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save a model made on a new version to an older version
Hi, I have a model on a version4.3, i would like save it on the version 4.2.. How can i do it?? Thanks
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Saving only the sequence
Hi If I make a model (geometry, physics, mesh) but do not solve it, the file size is naturally very small, 20 kB, for example. Solving it increases the size to, say, 10 MB. Fair enough, but if I then...
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How to design a SAW Resonator and how to improve the Q
Dear All the COMSOL Users, Can any one help me regarding the Designing of the SAW Resonators ( Procedure and how to build the Geometry of Resonators)
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Transport of dilute species module
Respected Sir, I want to know how a group of bulk reactions and a group of surface reactions can be written.I am hereby attaching the file. I will be greatly indebted if any one can help me. Thank you
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Fillet
Hello, I am trying to model the magnetic flux distribution. For the same scenario, in one version I added fillets to some key rough edges and in the other version no fillets were added. You can clearly...
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Joule heating problem - 2D and 3D simulations and compleatly different...
Hello, I am quite new to comsol and I have some problems with joule heating simulation. So when I simulate my structure with 3D simulation it shows me huge temperature on heated material, but is is not...
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Interpolation method in numerical integration
Dear all, I have a question regarding the integration mechanism in Comsol. If one integrates an expression with Comsol, for example on a 3D simulation volume, as a derived value in results or using...
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Error in burner model.
I am trying to simulate a version of the "syngas combustion in a round-jet burner" where heat transfer in fluids and reactive flow are coupled. The model works fine in the first step where the reactive...
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if statement
hi. i have a probleme with ' if statement'. if you can help me. (if(t<=12*36000,-0.75,-5)) thank's
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Importing point measurements (coordinates in xyz format) into COMSOL 5.0
Hi all, I am wondering if it is possible to import point measurements into COMSOL. I have a whole range of flow velocity and depth measurements for a river structure. I have already created the 3d...
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Deflection of a simple cantilever
Hi guys, currently I'm simulating a simple cantilever. The first thing i did was to determine its eigenfrequency. I got a value of about 504.5 Hz. I'm interested in the deflection of the beam as a...
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COMSOL on Amazonec2
Hi, I was trying to run COMSOL on amazon. While file following the link "www.comsol.com/shared/download...SOLOnTheAmazonCloud.pdf", I face errors when trying to install COMSOL on the AMI. When I try to...
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COMSOL cannot load MATLAB (on Ubuntu 12.04 and Debian 7.7)
Dear all, I recently experienced a serious problem when trying to use MATLAB functions in COMSOL on Linux computers, where COMSOL needs to call a MATLAB command line. I use COMSOL 4.4 and MATLAB...
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Band structure of a photonic crystall with a defect.
Hello! I need your help! I can calculate the band structure of a photonic crystal based on an infinite triangular lattice. So, I want to calculte the band structure of a photonic crystal with a defet...
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Modelling a heat sink with COMSOL
Hi, I'd like to model a certain Aavid heat sink that has a profile that can be seen in the picture I'll attach. I'm new to Comsol so I don't have much experience with creating objects of certain...
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heat transfer in thin film superconducting material
Hi , I am working on topic named heat transfer in thin film superconductor. where i am coating a superconductor layer on substrate and exciting it inside a liquid helium bath maintained at 4.2K. I am...
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undefined pressure variable error
Hi! I am new to comsol and I created this toy model to play with in order to get a better understanding. The model intends to simulate the rizing air in a cylinder. The cylinder has an inner and outer...
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effect of pml thickness and meshing in acoustics-structural module
Hi everyone, I am trying to simulate the frequency response of a thin membrane using acoustic-structural interaction module.The issue is with meshing of all domains and the pml thickness levels. For my...
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concentration in solute trasnport model
Hi all, I have a 2D model, coupled Fluid flow with solute transport in order to simulate the nitrate concentration inside my domain. I have soil column, which the left angle, is river and in the right...
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