Meaning of time depending solvers
There are various time depending (BDF) solvers, such as PARADISO, MUMPS, SPOOLES and Dense Matrix. Which solver we should use? Thanks.
View ArticleHow to model Surface Roughness in COMSOL 4.4?
Hi, I would like to model a bulk acoustic microresonator and investigate the effect of the surface roughness. I have read some discussions on surface roughness, however I could not find model for...
View ArticleProblem in finding reflection characteristics of silicon solar panel
I'm new Comsol, How to create a silicon solar panel (i'm using wave optics module for the creation ) . I need to apply Laser and short pulse on the substrate and find its reflection character. how to...
View ArticleIs there a variable Ex in Electromagnetic Waves module?
Dear all, By the question in the title, I mean a variable named exactly as Ex, without emw. prefix. Is it an internal variable? I input such a variable by mistake in a model. COMSOL didn't report an...
View Articlehow to do the research on Luminous efficiency about the LED andLED Package
I am a rookie in the simulation on the Luminous efficiency about the LED andLED Package,I need some Model and cases to study the efficiency and external quantum efficiency ，and also want to know how to...
View ArticleFar field projection of heterogeneous environment
Hi all, I am interested in far field distribution of scatterers placed over substrates. If I want to know the far field distributions of these kind of heterogeneous structures, will COMSOL give me...
View ArticleThin film
can any one help me for calculation of transmittance and reflectance of a thin film
View Articleoptical mode analysis with the geometry affected by mechanical force
I'm doing optical mode analysis given that the geometry of my structure is deformed by mechanical force. The displacement can be easily calculated. THE question is how to calculate the optical mode...
View ArticleImpedance in RF module & Transmission Line module
Hi ! I am currently on a project. I am trying to model human liver and the reaction of tissues due to the heat. There are models already set up in COMSOL. They are called "tumor_ablation" and...
View ArticleGetting scattered field from magnetic current
Hello, i'm trying to figure to out how to get the scattered field from a magnetic current excitation. The model is 2D, I have a arbitrary object. Then I assign a point to be magnetic current...
View ArticleSetting up plane wave
Hi, I am quite new to comsol. My problem is fairly simple. I want to simulate an incident plane wave in 2D using RF module and calculate Fresnel Reflection and Transmission coefficients. However, I am...
View ArticleExpression for microwave absorbed power by plasma
Hi My work is on mw excited plasma. I want to know that how much mw power is absorbed by the plasma. So which expression, I should use? Thanking you.
View ArticleRCS problem in 3D model
Hello! First of all, I need to let you know that I am a total beginner in these simulations so please be gentle :) I am trying to solve RCS for a 3D module by following a tutorial for a 2D RCS of a...
View ArticlePlotting unit length as a function of the angle of incidence
I am having trouble with presenting a polar plot for the RCS per unit length as a function of the angle of incidence for 3D model. If the expression for plotting the said RCS for the 2D model would be:...
View ArticleHow to add a condition on the mode solver when using the parametric sweep?
Hi, I am using the RF module of COMSOL 4.3b to determine the effective refractive index of the modes of a waveguide as a function of the wavelength (for instance between 600 and 700 nm). I am therefore...
View ArticleModeling of resonant absorbtion
Hello, I am wondering if it is possible for COMSOL to model the resonant absorption of protons in a static magnetic field. For example, if I had a 1T field along the Z-axis with a water phantom inside,...
View ArticleHow to set up the port?
Dear all, I use RF module constructing 2 models, which have same structures except the length. The input power and other parameters are also the same. But after simulation, the power at the incident...
View Articlemicrofluidic + external force field (optical force)
Hi, everybody I am a new user and just learned the tutorial of particle separation in microfluidics (www.comsol.com/model/red-blood-cell-separation-17013). I am working on a problems that how the...
View ArticleThermoacoustic imaging
I am working on doing microwave induced Thermoacoustic imaging simulation , i wonder if comsol have a special module to deal with converting the heat variation with time to an acoustic waves because i...
View ArticleHow to draw a periodic waveguide?
Hi all, I have a simple question towards for geometry for which I didn't a lot of search but still confused. So how do you draw a periodic waveguide that has a simple mathematical expression in 3D? For...
View Article