Current Source Question
Hello all, I'm trying to apply a current through 3 electrodes to my geometry, it works fine with ac sources, however when I try to change the current source to Pulse it crashes and gives the following...
View ArticleRFID_TAG
hello sir,I wanted to design a RFID Antenna tag in Comsol software. I need the proper guideline for this field so that i can design it
View ArticleSetting last time step as initial conditions of next thermal model run
Hello,I've been trying to create long time scale thermal models (2000yr+) by running them in 100 year segments and using the final time step to start the next 100 year run, saving each 100 year run in...
View ArticleNonlinear solver did not converge.
Hello,I made a fully coupled model of two physics (Darcy's law and Heat transfer in porous media) for 2D horizontal geothermal heat exchanger (i.e., coupled heat and moisture transfer in soil under...
View ArticleHow to create a function or variable based on results from component 1?
Hi all,I am calculating the stress change due to several point loads in the subsurface designed mainly in component 1 (solid mechanics module). I am expecting to calculate some other parameters which...
View ArticleExtract faces (surfaces) of an imported 3D geometry
I imported a 3D geometry (STEP file) in COMSOL and want to use shell elements for the interested faces for eignefrequency analysis.Is there a command that allows me to extract specific faces of the 3D...
View ArticleHow to trace particles in a time dependent flow.
My simulation is time dependent (Sinusoidal Velocity Inlet, zero pressure outlet). First, I solve the laminar fluid, then I want to trace particles in this transient velocity field. But all particles...
View ArticleHow to model a sharply changing BC
Ok, so I have a laser source that turns off at a particular point in time. I need to model the laser, heating and heat distribution until it completely cools off. I can do this with multiple steps...
View ArticleAdoptation and error estimate
Hello dear, I am trying to model a high mach number flow and as a part of that I want to use adaptation and error estimates in the stationary solver for refinement of the mesh where it is needed,...
View ArticleVanadium Rdox flow battery
I am a new user of Comsol. I'm working on the modeling of Vanadium Rdox flow battery.Please how do incorporate the local mass transfer coefficient, and source terms for species and charge in my model....
View ArticleScatterer on substrate in RF module
The below post is related to an archived discussionHi!I try to reproduce results from the "Scatterer on substrate" model using RF module in Comsol 5.0. I have set up the model and it converges in 5...
View ArticleHow to set z-axis parameters on a two-dimensional model
Now, I need to dispose a linearly polarized waves at an angle to the X-axis with my two-dimensional model,and the plane wave is traveling along the Y-axis. But I don't know how to define a parameter...
View ArticleMode volume calculation of whispering gallery modes
Hi guys,I am trying to simulate whispering gallery modes in a plasmonic hybrid resonator. I am using a 2D axisymmetric wave optics module. I need to compute the mode volume (as given in eq. 18 of the...
View ArticleRecording Heat Transfer
Hi everyone!I'm currently working on a power device, where I want to record the effective heat transfer coefficient, as inq=h_eff(T_ext-T);Here I have some power modules (P_in), that provides power...
View Articlecable
Hello! Cable losses in official submarine cables follow the law of conservation of energy, that is, the sum of core loss plus metal sheath loss plus armor loss is equal to three times the square of...
View ArticleCoupling Semiconductor and Heat Transfer
Greetings!First some information on my model. I have a model of 1D PN diode. I want to measure 3 features:Lattice temperatureincreasement due to forward current.Impact Ionization Generation RateSRH...
View ArticleFull S Parameter Matrix - I activated port sweep, but S12, S22 shows no data....
Hello. My question concerns an Electomagnetic Waves, Frequency Domain model.I am trying to obtain S11, S12, S21, S22 from a 2-port rectangular waveguide having numerical ports and a sample material in...
View ArticleKinetic inductance
Hi,I am simulating superconducting microwave resonators in COMSOL and I was wondering if there is a simple method of adding kinetic inductance to PEC boundary conditions. In other words: I have an...
View ArticleSpecify certain modes in my FEM model
Hello everyone,I am a new user of COMSOL. Now I build a simple beam with a PZT patch at the fixed side. I have two question here. 1. When I add a circuit at two side of PZT, the eigenvalue solve can...
View ArticleTo investigate the effect of different pellet size on emission of CO and CO2.
what equations i should use to model these two variables.I investigate it in terms of diameter of the fuel pellet.Where i wish to use this Shrinking core theory for my exlplaination. I did read that...
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