Unexpected behaviour while creating geometry
Dear all, I encountered the following problem while using Boolean Operations on Ellipsoids and Blocks: The attached image shows a cut plane inside the final 3D geometry, which looks like it should. The...
View ArticleMesh Control and Periodic Boundary Conditions
Are mesh control boundaries compatible with faces that are part of a periodic condition? I have a mesh I'd like to optimize with the mesh control operations but so far I've noticed that if the mesh...
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 Articlewhy COMSOL is solving so slowly
Hi All, I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I...
View Articleelectric field,temperature and pressure
Hi all, I've designed string insulator using comsol multiphysics 4 (3D) i've formed a cylinder around the insulator model as a air medium and i've given the conductivity and permittivity values. But i...
View Articlefield distribution
hello sir/madam, i designed a insulator and i want to analysis the field distribution along the surface of insulator but i can't get that please give me your succession and in this im going to place...
View Articlevisualization of results with hiding, volume works surface not
Dear, If I want to do a visualization of the results, I need just a part of the total structure to be plotted. Therefore I make a view and hide the parts which must not be visable. When I enter a...
View ArticlePhysics for FET based biosensor
Hi, I am currently working on FET based biosensor for cholesterol detecion.I want to know how to get the current as output and what kind of physics is most suited for this kind of application using...
View ArticleHow do I implement maxwell-voigt model in PDE mode
Hi, I'm trying to elongate a simple 2D model and I want to implement a maxwell-voigt type viscoelastic response. How do I implement this in PDE mode? or is there a simpler approach? Thank you in advance.
View Articlecolor rage manual
Hello to everyone! Could you please inform me on how i could change the range of a colour bar manually in a .3.5a file? (i know it's a too old version). Thank you in advance for your response! Marilena
View Articlewall effect on particle terminal velocity
in the model of 'sand settling velocity', 'symmetry' boundary is used, now I try to see the wall effect, so I changed it to 'no-slip', but COMSOL doesn't work any more. Is there any comment? Thanks!
View ArticleFlow of fluid over an obstacle
Hi. I am very new to comsol software. I have been trying to simulate the fluid flow in a microchannel. I have designed the channel in workplane and extruded it to 50um to get the 3d structure. In the...
View ArticleDifference in 3D simulation of duct to rotated 2D simulation?!?
Hi everyone! I created a simulation for a circular duct which is heated by a constant heat flux. Does it make a difference to simulate a 3 dimensional geometry or a 2 dimensional geometry (rectangle:...
View ArticleNano Dielectrics
dear sir/ madam how can i create nano composite dielectrics ? how to see the field distribution and heat transfer in nano compositedielectrics materials plz guide me.
View Articleplease help me how to eliminate the perspective effect .... how do you...
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View ArticleIntegration with a variable integration bound
Hi, i am using a 2D axisymmetric model. For my simulation i need to evaluate for each point (r,z) the integral of f(r,z')dz' from 0 to z keeping r constant. Can you tell me how to implement this in...
View ArticleTrouble with meshing/geometry
Hello everybody, I would like to ask for some help with my model. Basically, I have a parametric curve which is then revolved to form a spherical shell. The parameters of the curve will later be...
View Articlehow to model pipe with angle
Dear friends how to model pipe with angle in comsol. this structure is possible without meshing problem? can anybody help me Please find the attachment
View ArticleTime dependent study with Joule heating and thermal expansion physics
Dear Sir, I have made two 2D geometries using Joule heating and thermal expansion physics. I am using time dependent study. So the actuation electric potential is provided using the 'Piecewise...
View ArticleCOMSOL keeps closing
Hi I have an urgent problem concerning COMSOL. I am using modes such as "weakly-compressible navier stokes" and PDE modes, and I realise for some models I cannot open; the COMSOL will load and then...
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