Distance between two points
Hi ! Suppose I put two circles at position (0,0) and (0,2). If I rotate the second circle with respect to first(0,0) at a range (0,60,360), it gives a hexagon.Is there any way to confirm the distance...
View ArticleGenerating thermal resistance and thermal capacitance of model; OR import...
Hello everyone, I've been trying to control a heat exchanger model build with comsol. The idea is to control the temperature of the fluid running through the aluminium heat exchanger heated by two...
View Articlemodeling a Non-Newtonian fluid in rotating machinery
I modeled a rotating machinery and defined Non-Newtonian fluid in model. Unfortunately, when I run the model this problem occurred: Failed to find time step so that given tolerance are satisfied. What...
View Articlesplit a rotating machinery
I want to split a mixer (rotating machinery) into 4 part and then define a unique particle tracing physics for each part. How can I do this?
View Articleprescribed dispacement
Hello, I'm trying to do a simple thing with structural mechanics module, but I don't get convergence. I attached the model. I'd like to apply a prescribed displacement at boundary 2 and check the...
View ArticleHow to solve laplacian euqations on dielectric sphere?
Hi everyone, I'm a starter of Comsol~ I was trying to solve laplacian euqations on a dielectric sphere with a non unity permittivity e, where a uniform electrical field E was applied outside the...
View ArticleHow to get the intensity (or amplitude) of transient laser pulse?
Hi, I have a question on getting the intensity (or amplitude) of laser pulse in RF module. After having created a laser pulse as the sample of 'Propagation of a 3D Guassian beam laser pulse', how can...
View ArticleAC sources
Hi All, I am working on a project using comsol and I need to define an AC source. I want to use the Ac source to see the effect of bioheating. I don't know how to define an AC source and how to use...
View ArticleSchiller Naumann with Mixture Model
Hi folks, I have been trying to use the Schiller Naumann with Mixture Model to simulate a particle flow in water. I have previously used the Hadamard-Rybczynski model with smaller particles (Rep <1)...
View Articlethermal magnetic motor and or generator
Along time ago I had the thought after reading and studying about patents by Edison and Tesla on the development of a thermal magnetic generator and/or motor Has anyone ever tried to follow through...
View ArticleHow to applicate a Magnetic field
Hello I'm beginner wuth Comsol and i wish to applicate a magnetic field into the metal structure of a surface acoustic wave sensor. Thank you for your help
View ArticleLithium ion battery 1D model: solver error
hi, I am trying to solve the Lithium ion battery model from the model library (li_battery_1d). I am always getting this error message while solving study1 in it .Please help me on this. Repeated error...
View ArticleFGM materials
Hi I'am working on the vibration of FGM plate, and I need to change the gradient parameter in for several values ,so I tray to define a material Matrix ;case of anisotropic materials , after...
View Articlevariation of effective index with lambda
Hi everyone ! I want to plot the variation of effective index with lambda in COMSOL 4.3.151.First i think I have to define freq=c_const/lambda in parametric section.But after that what I have to put in...
View ArticleLaminar mixture model
Hi all, I am trying to simualte a steady state flow of liquid having nano particles of Copper (d=25nm). I have to use Reynolds number for which the Stokes flow is valid. Constant void fraction of 0.022...
View ArticleNo eigenpair solution selected
Hi I'm new in COMSOL. I want to find out eigenfrequencies of a pinned-pinned rectangular concrete beam. this beam has 5X5 cm cross section. It is a simple problem but I have some problems in getting...
View ArticleError to initialize a physics interface created with Physics Builder in...
Hi all, I am trying to compile with LiveLink for Matlab (Matlab version MATLAB_R2012a) a Comsol model (Comsol version COMSOL 4.3.0.151) that uses a physics interface which I created with the Physics...
View ArticleNatural Free Convection
Hello, I'm attempting to model the temperature rise above ambient over the period of one day within a sealed concrete trough buried in soil with its top exposed to outside air. I have successfully...
View ArticlePiezoelectric transformer interfaced with electrical circuit.
Hello, I have made a piezo transformer model and wish to drive it using an external electrical circuit interface. I have made connections to the electrical circuit elements using a voltage source, a...
View ArticleCOMSOL 4.3a Installation Problem
After installing 4.3a, whenever I open most files (or try to at least), I get the following error in a pop-up window:
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