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covering two parametric surface into a solid object
I use two parametric function to define two function, and want to generate a solid object based on the parametric surface. However, I don't know why I just could not do the conversion (empty output)....
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Solving a coupled system of convection-diffusion equation
Hi all, I am having trouble solving two coupled pdes, its described below I have a 2d system (square) and from the top boundary a nutrient (C) flows in to the square. I have set the concentration S=S0...
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Solution Changes with time
Hello every body, I have a problem and hope somebody can help. I compute a laminar two phase flow setting for for example 0 to 100 seconds and the solution is something. then when I compute the same...
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Very big difference in the results between direct and iterative solvers.
Hello, I am trying to solve a 3D Model using the MEF physics in the frequency Domain. With a rather coarse mesh I am able to solve the model (DoF~1e6) with the direct solver (PARDISO) and the global...
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particle size measurement
i asked someone to measure particle size for my calcium carbonate powder. he did and what he gave me as result was 1351.32cm2/g. this wasn't what i was expecting. i expected result in mesh, inches,...
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How does COMSOL recognizes t when you write it in a function?
Hello everyone İve been trying to learn and simulate heat transfer in comsol for the past 2 weeks and i have a problem i cant seem to figure out why. İve put a drichlet boundary condition on a surface...
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Help with Nerst Plank Equations
Hi, I have modelled a simple nerst plank equation with copper electrodes and copper sulphate. The equations on both electrodes is copper dissociating and plating (modelled as flux). The problem is that...
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Lumped Capacitor in the RF Module, eigenfrequency
Hello all, I'm using 4.4, and I realize it is impossible to add Lumped Capacitor and Lumped Inductor in RF Module Eigenfrequency study. (but lumped elements with Z value is possible, and Lumped...
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Solving enzyme reaction and diffusion
Hi, I am trying to solve a reaction diffusion problem. It is time dependent and I am expecting to get at t=0 the concentration of product at point d=0. My initial concentration of product is 0. There...
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capacitance as function of frequency
Hi all, I know how to simulate the capacitance of a static capacitor. Now I want to change the static voltage to a AC source and I want to see the capacitance as function of frequency. How can I do...
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Multiphase modelling of dense suspension help
I was going through the Multiphase model of dense suspensions tutorial and have a doubt in some of the steps. For the uniform concentration, there is no term "eps" in the expression for gamma. But in...
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concentrated species transport with moving mesh
Hi everyone, I am dealing with a model of binary liquid to evaporate. I use the concentrated species transport to simulate the concentration field of two components in liquid as well as a moving mesh...
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export comsol material library database into excel
Hi Dose anyone who would I be able to export all the comsol material library data into excel? Or anywhere I could find a comprehensive material properties data sheet? Thank you very much Ramsay
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Reference edge (current) direction in a multi-turn coil domain
Hello, I have designed a simple curved saddle coil pair in Comsol directly by using some blocks and boolean operators. After adding "Magnetic Fields" as physics to that component I created two domain...
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oxygen diffusion through SiO2 and a metal alloy (Mo-Si-B) in a two dimesion...
Hi all, I am very new in COMSOL. I am trying to learn COMSOL by doing a task. I am using COMSOL Multiphysics 5.1. The model description is like: There is a layer of SiO2 on a metal alloy(Mo-Si_B)....
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frequency domain study of a heat transfer model
Hi everyone. I am new to comsol, it would be appreciated if someone helps me. I want a frequency domain study analysis of a heat transfer model. Is there an easy way in comsol to do this.? Basically I...
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problem with capacitor having conductive media
I am using this one as example:www.comsol.com/model/frequency...-modeling-of-a-capacitor-12693 in the example, it use glass as media and conductivity is 0; if I change the media to pbs buffer, which...
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problem with consistent initial values
Hello. I am new to this forum, so forgive me if there are some technical problems with the way i define my problem. As you will see from the assembly i am uploading i try to run the simulation and i...
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Collision of a droplet and a solid particle
I want to model collision of a particle into a droplet. A water droplet is falling by gravity and a solid particle is shot toward that to hit the drop. Collision outcome is a conic liquid film...
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