How to define the zero potential at infinity boundary in electrostatisc of...
Hi, all I am not very familiar with COMSOL, just begin to learn, Looking forward to your help to address the issue "How to define the zero potential at infinity boundary in electrostatisc of ADDC...
View ArticleFace mesh does not respect face vertices
So I am trying to create a boundary layer mesh for a fluid flow model. I keep getting the following error Face mesh does not respect face vertices. What does this mean?
View Articlefinding fringe capacitance
hello sir i am new in comsol. i am trying to find capacitance of a device ..when voltage of drain=voltage of source=0 volt and gate =6 volt. but i don't know how to put boundary conditions on the...
View Articleacoustics
Dear sir, i am using acoustics equations are writing in Matlab. i need some help from you. In same equation are introduce in comsol and also avilable for matlab programs are introduce in comsol. give...
View ArticleHeat exchange during ice cube formation !
Hi, I'm trying to solve a heat exchange problem coupled to a phase change in 2D. The model consists in a small volume of water on contact with a metal plate. I cool down the plate gradually so at some...
View ArticleImplementing non-standard boundary condition
I am trying to solve a standard diffusion pde in potential form. The resulting equation consists of a term with a first-order time deriviation and another term with a second-order space deriviation....
View Articleimpose heat flux fluid/fluid Interfaces: laminar (tpf) and heat transfer in...
All, I would like to impose a heat flux on a 2D fluid/fluid interface. I have considered utilizing an equivalent volumetric generation using the delta function and even the tpf.Vfi function to turn on...
View Articlegot problem with my simulation on nano scale particles
I would like to simulate the magnetic force on an iron particle due to an external magnetic field. The magnetic field is generated by a wire, conducted with steady current. The wire is about 30um in...
View ArticleDependent variable definition
Dear all, I am having trouble finding which variables the solver is solving for. I know that I can see all the variables if I activate the equation view. However, out of all these I am not sure which...
View Articleimpact
how can i solve a structural mechanics problem where there is a contact between to structures with certain velocity?
View Articleabout parametric sweep and optimization
I built a reaction model, I want to know the equilibrium states of the reaction at difference concentration of one material. so I use the parametric sweep to calculate the equilibrium results. but when...
View ArticlePlotting unwrapped phase
I am plotting the phase response of a loudspeaker, and I want to unwrap it (like what the Matlab command unwrap() does)www.mathworks.com/help/techdoc/ref/unwrap.html Any ideas?
View ArticleInfinite elements problem in AC/DC modul
Hi all, I have problem concerning of "Infinite Elements" in AC/DC modul. I know there are couple of discussion about this but this is still unclear to me. I have read the manual and I followed the...
View ArticleSplit a surface
Hello, Anyone knows how I can split a surface or a solid to some sub-elements? I made a pipe in 3D and know I want to slice outer layer of the pipe into some clickable elements. I made a work plane as...
View ArticleThermoelectric Effect - Adding the physics
Hello, I'm working in a project on thermoelectric generator. As 'Thermoelectric' physics interface,is not in the physics area/physics list, I was trying to add the physics using the steps given in the...
View ArticleFlouquet periodicity on Eigenfrequency analysis 3D
Hi everyone! I'm trying to obtain dispersion curves for a 2D periodic structure in 3D. Already build the geometry (basically a ball inside a box), assigned the materials, and set the Flouquet...
View ArticleHow can I find eigenmodes propagating in given direction?
Hi! I have a general question about eigenmode problem in RF module. How can i find only eigenmodes propagating in given direction? For example, let's consider an infinite number of parallel cylinders...
View Articlematlab function unwrap giving odd results?
Dear all, I am trying to unwrap a phase plot, using the unwrap Matlab function. This function works fine in Matlab on the same data but gives erroneous results in Comsol. I added the function in the...
View ArticleRecalculating solution only for point probe
Hi, I am using comsol to model heat transfer in solids, but I am mostly intrested in the solution at certain points. I know that I can use domain point probes for this purpose, but I was wondering...
View ArticleCross Sectional Integration
Dear Fellows, I've got this problem since long time, and despite searching everywhere, I couldn't find the answer. The problem is a heat transfer with fluid flow coupled. I need to integrate over the...
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