Custom Periodic Boundary Conditions on spherical meridian sections
Hi I would love to know how I can implement the following Floquet-symmetry conditions on two meridian sections of a sphere (solid mechanics module)u_dst = R(theta) u_src exp(i theta)thanks in advance!
View ArticleElectroosmotic velocity flow profile
Hello,Please I am a beginner with COMSOL and I am trying to simulate electroosmotic fluid flow in a channel inrder to capture the plug flow velocity profile. I have used the creeping flow, electric...
View ArticleInterpolation function define in material list
Hi,I have read so many posts about this problem but still can't seem to find an answer:I'm trying to define my permittivity as frequency dependent in my material. I have an interpolation function of a...
View ArticleSolution does not converge
Hi, I am having trouble with my Comsol simulation. It is a simple heat transfer simulations, with a fluid of 200 deg and two surfaces at 100 deg. This is the error i get when I try to run the...
View ArticleInserting mathematical expressions under reaction field
I want to insert a differential equation in the reaction section as a function of concentration. The physics is "Transport of Dilute Species". The reaction is concentration dependent.Every time I...
View ArticleSimulate eddy current induced by switching off current source in short time
Hello,I am using COMSOL to simulate eddy current induced by switching off current source in short time. The most simplified model consists of a single turn coil and a copper plate. By switching off...
View ArticleScatterer on substrate problem
Hello,I tried to recreate the scatterer on substrate model as given in the comsol application gallery webpage. I later modified the model to my own needs by changing the nanoparticle used in the model...
View ArticleParametric Sweep "logarithmic range", how do you use it?
Hello!Could someone give me an example of how you are supposed to use the logarithmic range in a parametric study? This options has a entry called "step for decade," what is this?Thank you,
View ArticleHelp with boundary conditions on a simple model
Hi,I am quite new to comsol and would love to receive some advice on better modeling my system!I have a simple 2D axisymmetric model describing a 100 um water domain sandwiched between a glass slide...
View ArticleMesh Error on a complex geometry
Hi i'm trying to simulate a porous media with a random close packing, with a porosity of 0.6 My 3D geometry is a cube with spheres inside, i made the difference to simulate the porous, then i made some...
View ArticleHow to observe a field patterns other than excited frequency
Is it possible to observe field pattern other than the excited frequency. One smple experiment I am exciting a 500 nm width, 30 nm height Si waveguide at 193.42 THz with numeric port (boundary mode...
View ArticleCoupling Richard's eqn with heat transfer in porous media
Hi I want to know if it is possible to couple Heat transfer in porous media with RIchard's eqn?
View ArticleElectromagnetic wave solver outcome ?
Hello.When we get the electric field value from outcome of electromagnetic wave solver using permittivity, does electric field value means remaining electric field intensity after extinction or...
View ArticleTime dependent solver problem
Hii, i am facing a problem in comsol 5.2. i am always finding a problem in time dependent is that "Nonlinear solvee did not converge Maximum number of Newtonian iterations reached" please guide me what...
View ArticleReflection coefficient of geometries (perforated plate and nozzle)
I'm interested in calculating the reflection coefficient (aka trasfer impedance) of two geometries as a function of frequency and Mach number. One is a perforated plate with bias flow, the other is a...
View ArticleScattering Vs Impedance Boundary Condition for Plane Wave
I would like to model a plane wave with its amplitude and propagator. Can I model this using the source field of the impedance boundary condition? If so, do I need to include the propagator in the...
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How to consider the directions using up and down operators
I want to obtain the value in the boundary inside a domain. Like thisIf the boundary is horizontal, which direction is up?
View ArticleIssue with FNL Installation
Hello,I am having issues installing Comsol Multiphysics with a FNL given by my University. I have already tried following step by step the video installation guide "Installing Comsol Multiphysics with...
View ArticlePlotting electric fields along plane for MEF coil simulation
Hello,I'm relatively new to COMSOL and I'm trying to simulate the electric field created by an AC current within a toroidal coil. I have been able to simulate the B-field in the axisymmetric builder...
View ArticleTwo Phase flow fluid structure interaction.
Hello,I am relatively a new user with COMSOL. can anyonw suggest module for two phase fluid-structure interation. The two phase flow is liquid (water) and gas (nitrogen). I am trying to model with...
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