Unusual condition between two fluids
Hello, i`m new here, then sorry if this is a silly question... I need to set the follow condition in the interface between two fluids: ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) -...
View Articleabout heater simulation in the room
Hello! I am use comsol 4.3a , and use the non-isothermal flow physics to simulate the heater in the room. And the room has a door , and I want to set the door is open, and it is connect to the...
View ArticleThin liquid film with thermal gradient in contact with air (tpf, ht, ALE, AMR)
Dear all, I am modelling a thin film liquid in a rectangular channel (2mm), as well as the air on top of it. At the initial condition everything is within room temprature (Tc) then one side of the...
View ArticlePostprocessing-visualization of symmetric profiles
I solved the thermal stresses in a plate using two faces of symmetry, saving computational cost. I wonder if COMSOL allows me to mirror the two symmetric faces and visualize the deformation in the full...
View ArticleVarying the order of diffraction in Plasmonic Wire Grating
Hi, I am simulating in Comsol 4.2.I started simulating the PLASMONIC WIRE GRATING given in the model library.the simulation there is done by varying the angle of incidence.(in the parametric sweep...
View ArticleGeneral Projection Bulk Temperature Example & Question
Dear all, The following model may prove useful to somebody (other than myself) who wishes to calculate the average of some scalar value as a function of axial distance. In this case it's the bulk fluid...
View ArticleI can't deal with some contact problems
Hello, there are some contact problems, hope to get some help. I did a model which is two cylinders cross each other and the contact part range from a point to a surface, so here comes my questions: 1....
View ArticleTypical fluid-structure interaction model
Hi I am new and struggling to start a simple model. I have been playing with blood vessel model from the model library. I would like to look at the vascular behavior when blood vessel is impacted by a...
View ArticleHow to apply harmonic and random vibration's load?
Hello, I want to know how to apply harmonic and random vibration 's load in comsol v4.2, my previous operation is that first, apply a boundary load, then give a range of frequency, am I right? or...
View ArticleBuckling Question
Hi, collegues I really need your help. I solve a buckling problem in 2 steps: Step 1 fix a rod at both ends, make initial strain 1% (normal strain in "X" direction only) and solve a static problem (as...
View ArticleError in geometry compose operation
Hello COMSOL Users and Moderators. I have a geometry with is composed of two different domains. Both geometry files were an STL. The outer geometry is supposedly as the first domain and the inner...
View ArticleInduced charge on a surface by a charged object at different relative positions
Hello, I am new in COMSOL and I was wondering if anyone could five me any idea. I want to simulate the evolution of the induced charge on a surface as the relative position to a charged object varies,...
View ArticleEvaluate parameter value in MATLAB
Hi, If I have a parameter, e.g.:>> model.param.set('outer_z', '((volume*formfactor^2)/(2*pi))^(1/3)'); How can I in the easiest way evaluate the value of this parameter (like the 'Value'-column...
View ArticlePML for SAW interdigital transducer
Hi, i'm trying to simulate an interdigital transducer for SAW on a lithium niobate substrate but i have a lot of problems adding PML. I have previously simulated using periodic conditions but now i'm...
View ArticleUnable to create mesh : Error Free Tetrahedral 1
Hi everybody, I am having this error when I try to mesh a 3D structure : The following features have problems : Features : Free Tetrahedral 1 I don't find a way to have more information about this...
View ArticleLinking a Porous Media Flow to a Transport of Concentrated Species
Hello, I have created a chamber that has sugar water running through a compartment and carbon cloth modeled by a free and porous media flow physics. I also want to create a transport of a concentrated...
View Articleadvice for simulation set up or suitable tutorial (3D stress distribution...
Hi All, I am trying to help my fellow Orthodontics to showcase COMSOL's ability to simulate one of his problem. But I am struck and getting inconsistent results. The simulation is very basic and...
View ArticleModel couplings: Integration vs. Summation over nodes
Hello, I am working with two modules Structural Mechanics and general form PDE as coupled. I need a model coupling to define an integration. When I choose "Summation over nodes", my model works fine,...
View ArticleWaveguide amplitude errors, scattering boundary condition
Hello everyone! I am modeling a waveguide with the purpose of verification, but I am getting high errors in amplitude when the length of the waveguide is not a multiple of the wavelength of the...
View Articleaccuracy in evaluating refractive index
Hi, I am using RF module > perpendicular mode in order to simulate the distribution of modes and get the refractive indices, when I use related m.file of the geometry ,I get refractive indices with...
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