How to calculate farfield by nearfield?
Hi,I'm simulating a metalens, and I want to know the field behind the lens surface. If I just calculate the field of whole space, I would run out of memory. So is there any technics, through which I...
View ArticleConvergence problem in modelling
Hi I am a begginer in comsol multiphysics. I am going through the calculation of scattering cross section from gold nanoparticle situated over a dielectric substarte. There is a very nice example in...
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Are weak contributions applied by element or by selection?
Hello,I am using a weak contribution to couple two physics. I know that the weak contribution adds a term to the weak formulation in the form of an integration over a line, so that we have . This would...
View ArticleElectric Field and Equipotential Line Distribution Problem
Hello! I am a new user to COMSOL. Can anyone help me please?I wanted to generate equipotential lines distribution between 2 parallel metal plates that have a needle like structure attached to one of...
View ArticleQuestion about electrostratic charge model in cylinder
Hello!I´m working on a simulation of the electrostatic charge of a steel cylinder surrounded by an air flux. My doubt is about how i should configure the COMSOL software to obtain the electrostatic...
View ArticleDifference between acceleration and total acceleration
Hi all,In multibody dynamics physics I want to generate acceleration of a certain point in the global frame. Among the variables there is 'acceleration' and 'total acceleration' and both consist of...
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How to draw a Spiral Phase Plate in COMSOL?
Is there a straightforward way to draw a Spiral Phase Plate (as shown in the figure )? Here the thickness of the object varies with the azimuthal angle , as in
View ArticleSource Location when Coupling Electrostatics with Electrical Circuit
I am trying to model a parallel plate capacitor as a charge sensor in the Electrostatics (ES) interface and the measurement circuitry in the Electrical Circuit (CIR) interface. I've successfully been...
View ArticleDifference between COMSOL solution and analytical solution
I'm trying to model a load (a long mountain with vertical sides) placed on an originally unstressed elastic half space. I know what the solution should be based on an analytical solution. The solution...
View ArticlePressure distribution problems
I'm trying to model the flow of an ice deposit on top of a fixed rocky unit using solid mechanics creep (attached). The pressure distribution in the ice looks wrong to me. There a hump in the pressure...
View ArticleBoundary Conditions with Weak Form PDE's
Hello!Quick question, when I make the weak form of my PDE, I end up with domain and surface integrals.Do I input both types of integrals in the same spot? Are the surface integrals like using boundary...
View ArticleCould you help me with simulating drag force and dielectrophoresis force in...
I'm trying to apply a nonuniform electric field and create a dielectrophoretic force in a channel and put a particle in the middle of the channel. I added these 2 physics, creeping flow and...
View ArticleBand gap of lossy photonic crystal
Hello, Everyone!Currently I am trying to calculate a band diagram of a lossy photonic crystal. To do this I use the example posted on comsol site that is true for a conservative case. If one consider...
View ArticleCreate cortical shell around vertebra
Hello,I have imported a STEP file with the geometry of a human vertebra in COMSOL (see upload below), and I would like to create a corticall shell (0.2 mm) around all boundaries of the geometry. Does...
View ArticleHOW TO JOIN ILLUMINATI IN GERMANY/USA
HELLO EVERYONE its my pleasure to share with you my great testimony how MR CARLOS made me a member of the illuminatibrotherhood which has brought so much happiness into my life including my...
View Articlediffusion and reaction
oxygen is diffusing through a food matrix and react with the lipids prssent in it, due to this reaction another product produces. Can anyone help me for selecting the physics required. i have to...
View ArticleHow to partion 3D results without partioning the geometry
Hello everyone! First of all, thank you so much for the time you spend reading my question.I have results (velocities) from a 3D model. The results are realistic and accurate; however, I want to see...
View ArticleData of a Solid Element
Where can I see the data behind a 3D Solid Element in Comsol? In Ansys (sorry!) there is an option for each element were all data behind the element are visualized. Do Comsol have somthing like it?Data...
View ArticleIn comsol5.5, how do I enter the matrix and compute it?
Hi, I want to calculate the distribution of the electric field, but the expression has a matrix in it. So, what should I do to enter a matrix in coomsol5.5?
View ArticleCOMSOL with matlab cannot use "model.sol('sol1').run; "
DERA All, I use COMSOL with matlab to run my model with a for-loop (change some parameters every time) . About three month ago, I can use "model.sol('sol1').run; " to run my model. However, today, it...
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