Data set solution variables
Dear sir, I am following the 'cylinder_flow' model from the model library to illustrate integration of data sets. However, I am not sure which variables are being integrated. Therefore I have these...
View ArticleDense solver
Hi, Has anyone used the "Dense" solver? It is a new option for a Direct solver. The old option was between MUMPS, PARDISO, and SPOOLES. I couldn't find anything in the Documentation or on the website...
View ArticleField cage simulation
Hi, I am simulating a 300 V/cm electric field generated by a field cage composed of square copper plate (see enclosed figure). The mother volume is just a box of air, but in reality a gas will be used....
View ArticleHow to make a dependent variable does not take negative values?
Hello, I am modeling microorganiamo growth in a bioreactor, using the Chemical Engineering Module. The question is, as time passes, the organism grows and feeds on a substrate, the substrate...
View ArticleMaximum value at each point
Hi there, I'm fairly new to Comsol so please excuse me if the question is trivial: I have modelled the temperature profile in 3D for a slab that is heated intermittently from either side. What I now...
View Article4.3a demo: Battery capacity fade. There is an unwarranted parameter.
An interesting thing is discovered that the newly added demo "capacity fade.mph" in 4.3a was deleted in 4.3b for unkonwn reason. The capacity fade model was established by referreing to these two...
View ArticleCan I pause the calculation and check the intermedia result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermedia result? I would like to check if the intermedia result is reasonable or not. I don't want to only depend on the convergence plot....
View ArticleCan I pause the calculation and check the intermediate result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermediate result? I would like to check if the intermediate result is reasonable or not. I don't want to only depend on the convergence...
View ArticleUnexpected 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 ArticleModule 4.3b
Hi I am using comsol 4.3b and wanted to know which ACDC module would be best suited to model an interaction between an electric and magnetic field? Thanks
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 Articleconvergence history
Hi All, I find that I can show the plot of convergence histroy after I re-open a convergenced case. How can I retrieve the convergence history? Thanks and regards.
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!
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