Particle tracing: prevent particles from disappearing before too many wall...
Hello,I would like to simulate a simple model of particles accumulating on a surface due to gravity with the particle tracing module. I use a General Reflection wall condition so that the particles...
View Article3D BAW resonators
I'm a Phd studen, in my researchs i use comsol for the 3D modelisation of BAW resonators, i model my structure but when i run the model i have some errors, i need to have the steps for modeling the 3D...
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Referencing to domain numbers in equations
HiIs there a way to reference to the domain number in equations? That is, I'd like to set the voltage of an Electrostatics terminal to for the electrode that has the domain number 4 etc. The idea is...
View ArticlePeriodicity of a Unit cell
Does anyone know to apply periodic boundary conditions on a unit cell of a repetitive unit cell of a cellular structure? For example periodicity only in a particular direction, maybe in x or...
View ArticleNumerical Wave Tank
Dear all,I am simlating numerical wave tank in COMSOL 5.4. I do my simulation with Twophase_Flow ,Phase Field & Moving Mesh.I worked 2 models. Model 1 is 30 meters width & 5 meters height....
View ArticlePhD scholar
I have got a temperature contour plot after the simulation. But the graphic is not clear along transverse axis( y axis). How do I enlarge my temperature contour plot along y axis compare to x axis?
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Numerical solution of a highly nonlinear PDE and the absence of the soliton...
Hello. I try to solve the fourth order stationary PDE equation:for right trangle geometry.Following the procedure here and introducing and I rewrite the equation for the simulationThis equation can be...
View ArticleWave optics problem not converging for large domain size
I am doing a wave optics study on a nanoparticle inside a sphere (world domain) along with PML. Everytime I set the radius of the sphere to be larger than the highest wavelength used in my study, the...
View ArticleCOMSOL on new Apple ARM Macs
Does COMSOL plan to migrate its products to the new ARM-based Macs Apple announced at this week's WWDC?
View ArticleAcoustic Pressure Field vs Sound pressure level
What is the difference between Acoustic Pressure Field and Sound Pressure level? I came across a similar question but the answered that it is the same just Pascal to dB but I find my solutions to be...
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How to add initial conditions of discrete form to partial differential equations
I use the partial differential equation solution module in comsol to solve the dynamic model of flexible cables.a, b, c, d are constant coefficientsThe initial conditions required for the flexible...
View Articlenanosecond pulsed plasma
Hi,I am modeling a nanosecond pulsed plasma discharge to reform methane.I have imported an external CR circuit (.cir) to produce nanosecond voltage and also I am using plasma interfce. I have attached...
View Article"Failed to find a solution. Singular Matrix" error?
I am working on the "coil_problem" file as linked below. I am modeling it after the "spiral_inductor_example" also listed below, an example inductor made by comsol.I get this error in my file:Failed to...
View ArticleDefining Reflectance of Material Discontinuity as a Function of Angle of...
Hello,I was reading the Diffraction Grating tutorial for the Ray and Wave Optics modules, and Reflectance and Transmittance for the Diffraction Grating were able to be defined as a function of the...
View ArticleThe Transverse Modes for a Symmetric Laser Cavity
I want to simulation the transverse modes for a symmetric laser cavity which include a laser crystal. But I can't find a convergence solution. I am very glad if there are some suggestions. Furthermore,...
View ArticleHow to calculate the thermal focal length of crystals by the Ray Heating...
I want to calculate the thermal focal length of a crystal,but I have no idea about it,I need some advice.
View Articleproject the max temperatures into a 2D map of the domain.
Hi, I work with a 3D model and I want to project all the max temperature of each line on a plane (0.0.0).
View ArticleInconsistent cpu usage (AMD Ryzen 3900x)
Hi,I recently upgraded my pc (AMD Ryzen 3900x cpu) and I am noticing a significant decrease in performance compared to my old laptop (Intel 4700 cpu). When I inspect the processor performance its very...
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