particle emission from a fixed point?
Hello, I would like to make a charged particle tracing simulation. It seems to me that I can only specify an inlet at the boundary of a domain, i.e. of finite extension. Is it possible to specify...
View ArticleBody force driven flow
Hello all, I am trying to generate a body force driven flow. Consider a simple pipe , radius 0.2 m , length 2 m. Lets assume there is a uniform volumetric body force of ( the momentum source term F)...
View ArticlePeriodical boundary condition conflicts with inlet boundary condition
I am doing a simulation of a tube. To reduce the calculation scale, I would like to simulate only a little portion of this tube by using periodical boundary condition. By this boundary condition, I...
View Articleparticle emission from a fixed point?
Hello, I would like to make a charged particle tracing simulation. It seems to me that I can only specify an inlet at the boundary of a domain, i.e. of finite extension. Is it possible to specify...
View ArticleBody force driven flow
Hello all, I am trying to generate a body force driven flow. Consider a simple pipe , radius 0.2 m , length 2 m. Lets assume there is a uniform volumetric body force of ( the momentum source term F)...
View ArticlePeriodical boundary condition conflicts with inlet boundary condition
I am doing a simulation of a tube. To reduce the calculation scale, I would like to simulate only a little portion of this tube by using periodical boundary condition. By this boundary condition, I...
View ArticleParabolic inlet velocity in 3D geometry
Hi there, I am using COMSOL to model flow through a bioreactor with a parabolic velocity profile at the inlet. In a 2D geometry, for the inlet boundary condition I selected normal inflow velocity and...
View ArticleParticles release inlet setting
Hi, It is possible to set the number of particles per release from a boundary(inlet) dependent on the electric field (es.normE) present on the boundary itself? Setting a time-dependent study, the...
View ArticleKnow if a point is inside geometry in MATLAB livelink
Hi all,For a custom meshing algorithm (that inserts vertices at specific points) I need a way to know if a point is inside a geometry using the MATLAB livelink, without relying on an existing mesh. Any...
View ArticleEigenfrequency Linearization (transform) point
Hello,I've got some questions concerning the Eigenfrequency Study with serach method 'Region'. The Eigenfrequency Analysis calculates the complex eigenvalue lambda, which is a complex angular frequency...
View ArticleModifying region for Maxwells Equation
Hi All,I'd like to run a simple magnetic fields simulation, the caveat being there is a region where I'd like to slightly modify Maxwell's Equations. As context I'd like to model a superconductor,...
View ArticleHow to define time condition in frequency analysis
Hello; I have generated an acoustic_solid interaction model in frequency domain to measure the acoutic velocity of the formation surrounding a borehole. A monopole point source is located inisde the...
View ArticleError message: Failed to find a new solution
Hi, I am new to comsol.I have created a geometry which has silicon block on which there is a platinum strip to study the Joule heating due to current flow through platinum strip. On computing it shows...
View ArticleReducing the decimal point of the output of analytical function (Not reducing...
Hello,I have an analytical function (1.291E5 x exp(-1.528E4/(T-0)) of Electrical Conductivity, which produces outputs with far higher precision than COMSOL can handle (up to e-16). For example, if the...
View ArticleMaximum number of Newton iterations reached.
Hello everybody I'm currently trying to design a heat transfer with electric flow in Comsol. and I could not solve this problem for a few days. The problem is that every time I get an error saying:...
View ArticleMethod to cancel operation faster?
Hello all,I am trying to solve a very large geoemtry, it takes 15 minutes for my sad GPU to process the image and for comsol to display the model. Anytime I click on the mesh, datasets, or results...
View Articletest functions in weak form PDE
I have a problem with the definition of test functions in the weak form of PDE. Should I define them as variables? Because if I write for example test(p) the warning says unknown variable p. How can I...
View ArticleHow to simulate an incident plane acoustic wave on a baffled plate in a fluid...
Hello,I am trying to simulate the response of a baffled circular plate to an incident acoustic field inside a fluid half-space. The circular plate is clamped on the edges and is loaded by fluid on one...
View ArticleLiveLink™ for MATLAB about Anisotropic
hello，everyone！ I want to ask how to set the Anisotropic materials by using MATLAB ,because I want to model a period structure ,every unit with different Anisotropic materials.
View ArticleError: Recoverable error in residual, but solver could not recover.
The below post is related to an archived discussionThis errors has something to do with the mesh size. I got this error when I was trying to refine the mesh near a singular point in my model. However,...
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