Parallel computing MatLab Comsol
Hi, I am using Comsol 4.3 with Livelink for Matlab. I run an optimization code in Matlab where i call Comsol to perform frequency response simulations. Now i would like to start two parallel frequency...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View Articlegive specific values for every mesh point of a boundary as boundary condition
hey everybody, is it possibly to give different values for all points of the mesh on the boundary, respectively? for example, just a vector containing as many values as i have boundary mesh points, or...
View ArticleCurrent density and resistance in piezoelectric device
I am trying to simulate the current density in a piezoelectric device. The geometry is a simple rod with a fixed boundary (also ground boundary) and a surface load on the opposite boundary. I can...
View ArticleSurface growth and moving mesh (ale) ?
Hi, I am building a CVD growth model using the heavy species transport, much similar to the silane growth model. My geometry includes a small trench (um scale), where I deposit the material. Is it...
View Article"Error: Duplicate variable name."
I am using solid mechanics, electrostatics and moving mesh and I want to perform an Eigenfrequency Study. The solver crashes with an error message:"Error: Duplicate variable name." But I didn't find...
View Articlestability of geometry creation
Suppose that the geometry is not simple enough to be represented by regular geometry primitives. Then, there are two chooses: 1- use of parametric surfaces (possible as external function) 2- use of...
View ArticleCalculating contact area
Is there any way to calculate the contact area of a contact pair within COMSOL (ie without having to post-process data in MATLAB, which I have yet to try)? I have tried surface integration and other...
View ArticleS-Parameter in Complex format in COMSOL
I have not yet been able to find how COMSOL represent complex format of S-parameters. Can anybody please provide the correct format with reference? I am wondering if it is like S11=Re(S11)+j*Im(S11) or...
View ArticleRoot mean square in 4.3a
Hi I need to calculate the Root mean square (RMS) of a voltage. Are there any predefined functions in Comsol to do so. I searched the docs and got no clue on that. Thanks a lot
View ArticleLicensed number of users already reached
Hello, I couldn't open the versions 4.2a and 4.3 from COMSOL. A message informing me that the number of users already reached and the program closed automatically. It seems strange for me, because...
View Article2D electrostatic Force
Hi, I am modeling a slice of a simple comb capacitor in 2D. I would like to determine the force acting on the fingers. I can calculate the electric field, but when I try to determine the force through...
View ArticleIs the problem positive definite? Floquet periodic boundary conditions or PML...
Hello, I am doing some elastic wave simulations using solid mechanics module and piezoelectric module. And sometimes the DOF of my models are quite large so that I have to choose the solver manually to...
View ArticleHow to rotate a 2D Plot?
I built a model with a 3D geometry. Unfortunately the created 2D plot (postprocessing), which is based on a cut plane, is rotated by 90°. Is it possible to rotate the 2D plot back by 90° or to exchange...
View ArticleWhat physics do I need to model clogging of a vein? (very similar to...
If I have a species entering a vein at some velocity, how would I model the reaction with the surface and thereby build up of particles on the wall? I know I need some mass transfer equation (let's say...
View Articlepartial derivative of external MATLAB function
Hi, I am modeling reactive transport in COMSOL and have external MATLAB function to solve the chemical reactions. MATLAB function is defined based on five COMSOL variables as follows; FUNCTION NAME:...
View ArticleElectric field lines mapping
Dear all, I am new to COMSOL multiphysics software. I am doing electrospinning in which polymer nanofibers of the order of nanometer diameters are produced by applying a high voltage(of the order of...
View ArticlePoint Charge
Hello all I want to define point charges (lets say some circles as positive Or negative charges) in Comsol. Can anybody give me some idea how i can do this? what I have in my mind is: define a constant...
View ArticleUsing interpolation to define temperature-dependent material properties
Hi, I am a COMSOL beginner. Trying to added a file containing temperatures and measured material properties and then utilize an interpolation function to define the temperature-dependent material...
View ArticleHow do I make a laser on z-axis in 2D modeling?
Hi, I did 2D modeling in Electromagnetic waves, Transient mode. I wanna make a model in which the enhanced electric field is shown when a laser passes from air to nanopattern. however i don't know how...
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