Cut Point 3D Point Evaluation
Hi there I am trying to obtain data for a point on my model that is not directly defined within the geometry. I have used the "Cut Point 3D" to add a point on my model, then I was going to use the...
View Articlecoupling Electric Currents and Magnetic Fields
Hi everyone! If a model consists of both electric currents (or electrostatics) and magnetic fields separately (not using MEF), how do you couple them to make possible the magnetic fields can be...
View ArticleScttering problem using comsol4.2
I wanted to calculate scattering absorption cross section and thereby extinction for a nanoparticle. I am not sure how to go for that in comsol4.2. Can anyone please tell a basic flow to accomplish...
View ArticleSliding boundary conditions in Solid Mechanics
Hi! I am trying to model a sliding boundary condition between to elastic bodies. By sliding condition here I mean, that the DIFFERENCE between the displacement fileds should always be zero in the...
View ArticleMeaning of "node" vs. "vertex" vs. "degree of freedom" for linear finite...
Hi there, can anybody tell me what COMSOL means by the word "node" in contrast to "vertex" or "degree of freedom" when it comes to the discretization? I have...
View ArticleTime Dependent Study of an Airfoil- Lift Coefficient
Hi, I am trying to learn how to calculation the lift and drag coefficient of an airfoil running a time-dependent study. Below are the boundary conditions. Re ~2000 Inlet- Inlet U*step1(t[1/s]) Top and...
View ArticleRF: Emitting planar light from PORT (3D)
Hello my friends. I am trying to construct a model where the port is placed along the y,z-axis and emits light in the x-direction. However, I do not want to just emit light normal to port's surface, ie...
View ArticlePlot of a line between two points in 3D
Hello, I need to plot a line that describe the electric field between two points in 3D. I tried the way I used to try in 2 D but obviously it didn't work as I wanted. It didn't give me the plot I...
View Articledesign and analysis of 2d single axis capacitive accelerometer
hi, I have designed 2d single axis capacitive comb drive accelerometer, i am getting the same deformation for the different g-forces but displacement value is changing. help option present in comsol...
View Articleinsulated electrode solution interface, assistance requested.
Hello, I'm a beginner with COMSOL and appreciate any guidance that could assist me learn more about this powerful tool. I have a question about modeling the voltage drop across the electrode-solution...
View Article2D coplanar waveguide Port Modeling
Hello everyone, I have a very simple 2 D model of the crossection of a coplanar waveguide (substrate in an air box, at the boundary between substrate and air I have lines for the metallization). I want...
View ArticleHelp variables in weak form
Hi, I'm wondering how to insert a help variable in the weak form. I am solving for three variables u1, u2 and u3. However, my weak form integrand is a complicated function of these variables. So I...
View Articlemodifying Vibrating Beam in Fluid Flow
I am trying to modify Vibrating Beam in Fluid Flow, which is given a example of FSI on this site. what I want to change is the condition of the cylinder. In this example, the cylinder is fixed,...
View Articlecan we bound a dependant variable?
Hello, I use laminar flow plus adding a convection-diffusion equation as a pde one to NV and continuity equations(time- dependant) to solve my simulation. The problem that I have is that the magnitude...
View ArticleCan I make a project on a mac and open it in windows?
As the title says really, I have made a Comsol file on a mac and I want to run it on a Windows machine. Will this work? Or will Comsol on Windows reject it? To further complicate things, my mac is...
View Articlemixing of fluids!!
hii!! I am using this software for the first time and i need help... I am using version 4.0a.. i want to know how to mix 2 liquids (blood and glucose) with different properties in a cylinder which is...
View ArticleMake my model infinite at one direction
In order to make my block having an infinite length in x-direction (as it is a stripe of graphene and extends along its length to infinity) Should I use some specific Boundary Condition??
View ArticleModulo function for making pulse train.
Hi, Trying to make a pulse train by combining the heaviside function with the modulo function, as described in a previous post. The heaviside works fine for one pulse: (flc2hs(5- t),1) But when I...
View ArticleCreate Equation
Hi In COMSOL it's given the wave equation (file 1) - PDE waeq but I want to use other form of this equation (see file 2) this means I need to create or modify the equation in the COMSOL how can I do that?
View ArticleFluid flow channel in cantilever beam
Hello, My model is the following: a cantilever beam has one longitudinal channel containing a fluid flow. My goal is to find the effects of the fluid flow (viscosity, velocity, size of the channel) on...
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