Calculate the effective thermal conductivity
Hi, im very new in Comsol and its my first post here, so if you need more information for saving my problem just let me know. I want to calculate the effective thermal conductivity of a tank containing...
View ArticleRestricted Solution Set
Hello All, I'm trying to fit parameters to my model (using some known experimental values), the thing is that it's not computationally cheap to evaluate. I have a voltage source and all the model does...
View Article3D conduction with heat flux
Hello, I am trying to build a simple model of a channel in 3D. I set a physic "Heat transfer in solids" and I stablished the following boundary conditions: - heat flux of 800W/m2 in one of the faces -...
View ArticleFinding mesh volumes for volume integral
Hi all, I have calculated an energy density (per volume). Now, I am trying to find total energy by integrating this energy density. I have a list of (x, y, z) coordinates and each point's energy...
View ArticleConstraint found for variables in different Segregated groups. Try to merge...
I am trying to solve for the emf induced in array of coils placed above an array of magnets orgranised with opposite polarity. Here the magnet array is vibrated in x-direction and coils are stationary....
View ArticleParticle Trace Value
Hello All, This might be a bit of a trivial question, but I'm not sure how to do it. I solve for an electric field in space and everything is fine. I know about the particle trace graph where I can...
View ArticleShape optimization on loaded knee (L-sock)
Hi everybody I'm doing shape optimization on the loaded knee. I've made the geometry similar to the image posted, instead I've just put a fixed constraint on the upper boundary and the force is working...
View ArticleHeat Generation in a Disc Brake with 4 brake pad
I'm newbie on simulations, I would like to know how do I resolve some issues I'm finding my style. I want to make a simulation of heat transfer with four brake pads on a disk. I took the model that has...
View Articlewaveguide to microstrip Measure s-parameter
Hi, I am designing simple rectangular waveguide of some 50x100. Then i try to catch microwave signal from waveguide to microstrip with 50 ohm strip line. I used FR-4 as material and copper ,...
View ArticleImport S-parameters of Transistor or diode in comsol from Agilent ADS...
hi, How i can import S-parameters of transistor or diode (active component) from Agilent ADS and then simulate in COMSOL. I have one microstrip coupler which is connected with diode. i want to import...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View ArticleLaminar flow without outlet (mixing with sliding wall) does not find solution
Hey, I have been trying to simulate a system where a sliding wall is causing convection in a closed box. In brief, the system is a box with one wall sliding at a rate of 0.01 m/s. The other walls are...
View ArticleDrop Test Simulation
Hello, I am a Mechanical Engineering graduate student and I wish to simulate drop test of a human head form. I have a few questions which I have enlisted below: Can this kind of explicit dynamic...
View ArticleI wonder why the result is changed?
Hello. I have a problem. I simulate lots of time with same geometry and same condition. But when i open new Comsol and set same way before, but the result from new one is different from previous one. I...
View ArticleFluid flow in a heated flux media porous
Hello, I pretend to built a model where I simulate the heat transfer to air flow through a porous media (in a channel with an inlet and outlet). My fluid is the air and the porous structure is the SiC....
View ArticleSurface Reactions in a Biosensor (model ID: 10428) Failed to evaluate jacobian
I'm following the model instructions exactly but getting this error: Failed to evaluate variable Jacobian. - Variable: chsr.theta_i_cs_P - Geometry: 1 - Boundary: 12 13 19 20 Please advise.
View Articlemodel coupling between different dimensions
Hi everyone, I am trying to do a coupling between a 1D component and a 2D component. What I am trying to do is I solve a 1D transport equation. At one boundary (point), I want to evaluate the flux. The...
View Articlegeneral question about mass fractions/transport
I have a basic question, I have two reactors in contact with each other, both starting with the same initial conditions (equal amounts); compound#1: solvent Compund#2: A compound#3: B while in one of...
View Articleabout 'undefined value found'
I was running a coupled laminar flow and species transport model perfectly fine. But after I scaled the geometry to be isotropically 10 times larger, COMSOL came up with error 'undefined value found'....
View ArticleHow accurate is Comsol compared to FDTD
Hi: I am a comsol user. My supervisor asked me to re simulate a design that was done in FDTD using Comsol. The problem I got is that my solution was not the same as the FDTD solution!!. I am sure I...
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