"Use space coordinates as arguments" check bock - Interpolation Functions
Dear support-team, recently I updated my Comsol from 4.2a to 4.3a. In my models I use the interpolation functions. In the 4.2a version there was a check box "Use space coordinates as arguments" which...
View ArticleMathematical Particle tracing - resintence force
Hi! I'm trying to compute some trajectories using Comsol Math. Particle Tracing in the Newtonian formulation for some force which is of the form: F=F1+F2 where F1 is proportional with the...
View ArticleMathematical Particle tracing - resintence force
Hi! I'm trying to compute some trajectories using Comsol Math. Particle Tracing in the Newtonian formulation for some force which is of the form: F=F1+F2 where F1 is proportional with the...
View ArticleSystem matrix error in structural mechanics module
Hello! This is in reference to a femur model built to study stress and strain variation upon application of force.However,even after setting the boundary conditions and meshing,it displays an error...
View ArticleRelative Permittivity
Dear All, I am performing FE simulation on piezoelectric material. In the material properties section, relative permittivity is provided for both strain and stress charge form. Does anybody know how to...
View Articleinductance
I need to calculate the inductance for a wire (with a arbitrary cross-section) place in a arbitrary tube. That is, an arbitrary coax line. I need to calculate the inductance (both internal and...
View ArticleShape of sessile drop
Hello, I am trying to model the equilibrium shape of a sessile water drop in comsol. I have used a 2D axisymmetric laminar two phase, phase field model for the same. I started off with the shape of...
View ArticleShape of sessile drop
Hello, I am trying to model the equilibrium shape of a sessile water drop in comsol. I have used a 2D axisymmetric laminar two phase, phase field model for the same. I started off with the shape of...
View Articlecylinder roller contact (contact mechanics) modeling problem
My model is pretty simple: a cylinder contacting an infinite half-space and I want to find out the deformation at the contact area as well as the stress distribution in the half-space. Actually this...
View Articlefailed to evalute variable Jacobian"
Hi: I am designing a structure which is gold stripe that is put above Silicon. I am trying to plot the Electric field (y-component) of the resulted mode. The problem is that I did not get the mode. I...
View ArticleDirect comparison to strain gage
I'm modeling a simple fixed-free beam to compare with a piezo strain gage with a foil strain gage that I have on an actual beam (aluminum, 20cm x 2cm x 2mm). I'm trying to decide which strain I should...
View Articlethermal expansion leads to overlapping domains
Hello! I have a model composed of three layers, three different materials, of very different coefficients of thermal expansion. The top layer has cracks built into the geometry. The first two study...
View ArticleTransmitted evanescent compoent after passing through the periodic grating...
Hi everyone, I am folloing the tutorial model about plasmonic_wire_grating. By setting those ports, I can get the transmission and reflection for different diffraction orders T_+1, T_-1 , as the same...
View ArticleDeformation of liquid droplet
I am new to COMSOL, so I am referencing a work on deformation of liquid droplet impacting a solid surface. I tried to recreate the same model as that work. But I ran into several problems. As I tracked...
View ArticleGeometry problem "unknown geometry -Tag:null"
Hello! I have done a Chemical Reaction engineering simulation and have synchronized it with a geometry. The fist model I did was too large, so I wanted to create a new one. I have done this by buildung...
View ArticleModelUtil.connect(solverHost, solverPort);
Hi everyone, I try to compair the results of two solvers running in parallel on two different comsol-servers. Therefor I try to establish a link from my Java-API to two comsol server. But only one...
View ArticleWhy does my parametric sweep slow down?
When doing nested parametric sweeps, they start off fast but slow down to a crawl eventually. What am I doing wrong here? Is there a faster way of doing this? Seems it has little to do with my computer...
View ArticleVoltage source in AC
Hi. i'm studing an inductor to analyze inductance and resistence od the model. I use electrical circuit and i work with AC frequency of about 20kHz and i have some questions: 1)Vsrc in voltage source...
View ArticleHeat source
Hi all, I have a model composed of three layers, three different materials. How could I insert a triangular power profile(as heat source) in the second domain. Example of power profile ( t=0s P=0w;...
View ArticleLumped port
Hi, Do i have to use some particular dimension when i use a lumped port? I mean do i have to use a particular hport an wport ratio? Thanks Nicola
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