Find Cross Sectional area perpendicular to an axis at every point
I have a variable diameter hose and I want to find the mass flow through this hose at every point. There are no bends in the hose except to change its diameter so the hose's central axis is in a...
View ArticleCluster computing
Ä° am trying to solve a problem using cluster computing with HPCS 2008. Comsol starts solving the problem using the nodes. At the end of first iteration, program does not show any progress although it...
View Articlecluster computing
I was trying to solve a problem using cluster computing with HPCS 2008. The program produced the foowing error. What can i do to solve the error. --------- Current Progress: 100 % Memory: 336/342...
View Articleliquid thermal expansion by comsol?
Hi I want to simulation air thermal expansion in a sealed chamber, leading to a deformation of PDMS thin membranes on the top of chamber. I can not find suitable example form COMSOl. Does anybody give...
View ArticleModeling a transient plane-wave
Hi, I have just started learning myself Comsol 4.1. I have earlier experience with version 3.5 , though. My question relates to time-dependent transient analysis in RF-module. I would like perform a 2D...
View ArticleStep function
Very simple question, but I can't find out how to do it. I have a external temperature, "Temperature 1", which is 100 C. After 330 seconds I would like it to drop 80 degrees to 20 degrees. I should be...
View ArticlePML refractive index
Hi, I am studying a model of Step index fiber and I want to put a cylindrical PML around the core. What should be the refractive index of the PML , should be same as refractive index of the cladding or...
View ArticleMass Concservation in Two Phase Pipe Flow
Hi folks, I was wondering if there is a way to check if the mass conservation principle is uphold in COMSOL for pipe flow. I am using glass spheres in water in my simulation and due to some...
View Articleexporting data
Hi all I have a 3D cube and I need to get isothermal lines at the surface of the cube.If I am using the contour plot (line) option but the quality of isotherms are not good. Can anyone tell me how to...
View ArticleDefromed Mesh
Hi everyone. I designed a 2D rectangular object with a deformed mesh composed by a set of points interpolated between them in order to realize lines. How can I "move" such a structure in COMSOL 3.5a (I...
View ArticleTotal Mass and Mass Flow Rate discrepencies
I have a pipe that flows air through a porous media. I calculated the mass flow rate by doing a surface integral across my inlet and outlet. I put fp.rho*v in the integral expression box (where v is...
View ArticleError in comsol: Automatic scaled regions cannot treat selections without...
I am trying to simulate an optical nano-antenna where I used a spherical coordinate. However I am getting an error like "Automatic scaled regions cannot treat selections without exterior and interior...
View Articlequestion in the blood vessel tutorial
In the attached tutorial, on page 15, the force (boundary load) in the x,y,z directions is specified with a negative sign. I am wondering if someone can explain what the negative sign signifies. I am...
View ArticleModal Mass calculation
Hi Is it possible to calculate the modal mass for a particular mode shape? Can someone please explain how to do it.
View ArticleMetamaterial relative permittivity
Hi everybody. I realized with MATLAB (not LiveLink) a metamaterial permittivity distribution. It consist in (x,y) point coordinates and relative "epsilon" values, like: x y val 0 1 0 .... 4 2 10 .......
View Articlechanges in geometry
hi, am designing a 3d comb drive accelerometer, i have made some perforations in the proof mass( circle) when i run the model, shape of perforations changes to octagon..cud any1 help me wit this..
View Articlemagnetic-Fluid-Structure Interaction in a Network of Blood Vessels
The blood vessels are embedded in a biological tissue (the cardiac muscle) and, during the flow of blood, pressure is applied to the internal surfaces producing deformation of the vessel walls. In the...
View ArticleAxial flux permanent magnet generator
Hi Dr. Ivar/All, Iam trying to simulate the axial flux permanent magnet generator with two rotor and a coreless stator sandwiched between two rotor. Permanent Magnets are attached on inner surface of...
View ArticleTime derivative of a surface integration in 4.3
Hi I'm using the magnetic field (mf) physic in time dependent study. I want to calculate the voltage V(t), as v(t) = - d/dt(flux phi) (time derivative of the magnetic flux). I serched the docs and...
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