Flow in a pipe with a very large aspect ratio
I'm trying to solve what should be a very simple problem as part of a larger project I'm working on. It's just laminar flow in a pipe of length 14,000 feet and radius 0.04 feet. I'm just trying to find...
View ArticleSymmetry
Dear all, sorry the continuous questions today! I am going to use symmetry for the geometry as in the picture I attached. The simplified geometry is a multilayer (only the green part) composed of...
View ArticleUnknown heat source in heat transfer-laminar flow coupled model
Hi all, I am modeling a volcanic conduit (5 m wide) moving up through a "host rock." I want to analyze the thermal budget of this situation. The conduit is a rectangle (Heat Transfer in Fluids, Laminar...
View ArticleHow to use alpha ( thermal expansion coefficient) as piecewise function.
Hello evrybody, I m using a time dependent problem of a beam restricted at both ends. When we use alpha ( thermal expansion coefficient) as a piecewise function, then they give error as "Failed to...
View ArticleRod buckling
Hi, colleagues I'm a new user of comsol and I need to solve a easy task at first: buckling of a rod under pressure. What kind of solver should I use to get both amplitude and wavelength of undulation?...
View ArticleRod buckling
Hi, colleagues I'm a new user of comsol and I need to solve a easy task at first: buckling of a rod under pressure. What kind of solver should I use to get both amplitude and wavelength of undulation?...
View ArticleProblem with wall layer
Hello Comsol Community, I'm new to Comsol and modeled a U-shaped pipe in a concrete block. Cold water (1°C) flows through the pipe and the warmer concrete (11°C) surrounding it warms up the water...
View ArticleEvaluation of Volumteric displacement
Hi all, I am modelling a diaphragm deformed under pressure loading in an axisymetric model. I was wondeing if there is a way to evaluate volumetric displacemnt of the diaphrgam due to displacement....
View Articlespecifying materials in Matlab
Hello, I am trying to setup a simple Matlab script to calculate modes of a step-index optical fibre (there is a tutorial model which describes in much detail how to do that in Comsol, but no mention of...
View ArticleSaving error
I cannot save my model. Is it possible because of the many data points I have? If so, then what other option do I have?
View ArticleGenerate and plot 3D solution, given 2D solution
Hi all, I'm using weak-form modeling to solve for a vector field u(x,y,z). The vector field has 3 scalar components u1, u2 and u3. I know the functional form of the solution in the z-direction; it is...
View ArticleParametric sweep
I have a range of angles set as parametric sweep ie range(0[deg],0.1[deg],4[deg]) And also I have a study in frequencies with range(2[THz],0.1[THz],5[THz]) When it solves it puts them all together in...
View ArticleMesh element volume
Dear all, I have a material property having a different value in a domain and it is function of individual volume of deformed mesh element and undeformed mesh element. Could you tell me how to get the...
View ArticleFluid structure interaction module discussion
Dear all, After trying for three months on Fluid structure interaction module, i decide to seek help.and hope some fluid structure module user can give some feedback. You may refer to comsol model 660...
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 ArticleEffect of sound pressure on refractive index/density
Hello fellow Comsol users, Most of my experience comes from structural mechanics and fracture and would like to ask a little help regarding pressure acoustics. The presence of high and low pressure in...
View ArticleAbout creation of struturegeomerty
Hi...! I am a student of University of Pune,working on Rf MEMS Switch. I can't get how to create a structural geometry of cantilever beam in Com sol multiphysics. So please help me to create a...
View ArticleAC Electrical Field simulation in interdigit structure
hi I want to do AC filed simulation for interdigit structure. I am wondering what kind of physics should I select and how I can apply AC signal to my structure? I would appreciate any help
View ArticleTemperature change from expansion of air
I am trying to model the flow fields of a fluid (air) traveling through an orifice. I have a working model that works great using only the laminar flow module. However, the viscosity of the fluid is...
View ArticleGenerating continuous electrons from cathode
Hi, I'm trying to simulate an 13MHz electron gun with an oscillating grid voltage. I have created the necessary 13MHz fields. But I couldn't create the electrons continuously with using "Release from...
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