streamline problem
Hey, i am having some problems creating the steamlines for my Helmholtz coil. I followed the steps for the one of the model on comsol website for Helmholtz coil except other than revolve to create the...
View ArticlePoisson-continuity coupled equation
Hello, I try to model the corona discharge in wire-cylinder geometry governed by the equations: nabla (V) =- rho/epsilon0 (Poisson equation) and grad (rho) * grad (V) = rho ^ 2/epsilon0 (equation of...
View Articlesaw sensor for pressure measurement
hello, i am designing a saw sensor for pressure measurement.can somebody suggest me which formula i need to use in comsol in order to measure pressure. it should be related to change in frequency of...
View Articlenumerical oscillation in modelling corona discharge with coefficient form...
Hi,everyone I,m working on modelling corona discharge in air with coefficient form PDEs and Electrostatics interface. I'm encountering the problem of numerical oscillation in the simulation area...
View ArticleThermal Stress Static analysis
Dear Concerned, I have comsol 4.2 version package. In this regard i am facing a problem to define spatially varying force on a boundary in 2D space. For instance, if i have a line extending along...
View ArticleStructural analysis 2-D stress plot overlapping
Dear Concerned, How can i overlap von mises plot of 2D asymmetric formulation with a 2D plane stress formulation for the Same Geometry.
View Articlecoupling model, extrusion 2D-axy towards 3D
Hello, Is it possible to re-use temperature boundary results of a 2D-axy simulation towards a boundary destination of a 3D model (4.3a version)? Which operator could I use if it's possible? Thank you...
View Articlehow to enter a Channel thickness
Hi everybody, how to enter the Channel thickness? I use the (laminar flow -> mass flow -> mass flow rate -> normal mass flow rate), but get an error! I read a comsol documentation and I think...
View Articlesafe to manually delete?
hey there I uninstalled all the old version of COMSOL over control panel but I still found lotsa old directories C:\Users\xxx\.comsol\v(n) is it safe to delete all of the old ones manually? Appreciate...
View ArticleCOMSOL external MATLAB function
Hello forum. I want to use an external matlab function to define a local heat transfer coefficient distribution. If I use a very simple external function, everything works fine: for example: function...
View Articlemagnetic shielding with mumetal(nonlinear - saturation)
Hi I need some help with my model.... I have a 3D sim, A current line that generates my field and a mumetal infinite plane(1m*1m*0.5mm) The 0.5mm is the thickness of my mumetal. I have 0.5T on the...
View ArticleManipulating variables from 3d to 2d temporal
Hi: I'm working with a coupled heat transfer - momentum equations, but what I need to do is to use a dependent variable previously solved which depends on x, y and z axis in a 3D system, being...
View ArticleGenerating shear waves induced by a piston hitting to a model
I want to generate sinusoidal shear waves and observe its propagation induced by a piston hitting a 3D model. I think what I would like to do is similar to paper presented by S.Audiere...
View Articlemagned no moving
Hey. I have this problem: I have two magnets oriented so that the north pole of one facing the North Pole 2 in the common axis X. Magnets are so close to each other should be repel. But magnets will...
View ArticleComputing the inductance of a Wire
Hi! I read "Computing the Resistance of a Wire" post. It is easy for compute resistance of wire, but how i can compute the inductance of this wire?
View ArticlePDE solving or defining force in terms of displacement
Hi, I hope you are doing well, I am a new user of Comsol. At this moment, I am trying to model a cantilever beam with an applied force on its edge as a function of displacement. So, what I need is...
View ArticlePDE - Contact Resistance
Hi Everyone, I am wondering how to implement electrical or thermal contact resistance when using the PDE physics. I am using the PDE coefficient form to model thermoelectric effects at a...
View ArticleNanoparticle heating with Surface Plasmon Resonance (SPR)
Hi Fellas, I am trying to model heating of metallic nanoparticles when exposed to Laser/Solar light with Heat Transfer module. I am new to comsol and I do not now how to model the incident light and...
View ArticleHow to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View Articlestreamline problem
Hey, i am having some problems creating the steamlines for my Helmholtz coil. I followed the steps for the one of the model on comsol website for Helmholtz coil except other than revolve to create the...
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