how to calculate deformation??
hi, i am trying to design a nanotube based pressure sensor, am getting some displacement values for pressure applied on nanotube boundaries but how can i verify the result...how can displacement be...
View ArticleHow to solve a ODE or PDE equation?
Hi~ I try to use COMSOL to solve the mathematical problem. I have a PDE equation in attachment. How could I use COMSOL to solve it? Thank you~
View ArticleEditing equationin at Expression in Variables from Equation views
Hi all, I’m playing with thermo-mechanic coupling. In the mechanical part, I use solid mechanics with Norton Creep. In this creep, I would like to have nD=1. That’s why I’ve changed Expression in...
View Articledefine the propagation constant and angle of incidence and refraction at...
Dear friends, define the propagation vectors in a multilayer system. i have attached the simulation detail in the attachment . somebody help me out to solve this problem Aim: To find out the...
View ArticleImpedance mismatch in quasistatic
Hello everybody! I need the help of people familiar with AC/DC and RF module. I am working with a 3D structure consisting of 2 pads, 100um*200um*0.2um, separated by a 1um slot line. The pad are shorted...
View ArticlePipe flow module / Falied to evluate variable Jacobian
I am working over a simple pipe flow problem, where I encountered with an Jacobial Error saying ; Failed to evaluate variable Jacobian. - Variable: mod1.nipfl.u3 - Geometry: 1 - Boundary: 7 10 13 I...
View ArticleTheory of Brinkman equation
I'm checking the theory of the Brinkman equation in the manual. There's a term I don't understand where stems from: 2/3nu(nabla u). I also checked the given references but this term is not metioned....
View ArticleLivelink for Matlab
Hi, I would like to create a simple model using API in Matlab. When I type the command "shell.feature.create('fc1', 'FixedConstraint') ", errors "Unkonwn feature ID#FixedConstraint" exsit. I have...
View Articlemodel coupling
Dear sir or madam, I have a problem about coupling of a laminar flow domain and thin film flow-shell domain, 3d case. I have to transfer the pressure on an edge to the whole surface,shown in the...
View Articleliquid loading
I'm a beginner level COMSOL user and new to this forum. So please excuse me if I happen to ask a really silly question. I've been trying to simulate the behaviour of a piezoelectric crystal upon...
View ArticleCavitation in thin films
Relating to this topic from 2011: www.comsol.com/community/forums/general/thread/22758 Are there already tools available within Comsol to investigate cavitation effects in thin fluid films (such as...
View ArticleComsol won't create multiple meshes
I have a problem with Comsol and meshes. I have a carbon fibre, with copper at either end, sitting on top of a piece of glass. I illuminate the carbon fibre and look at heat transfer. I need a good...
View ArticleMesh creation
Hello, I have a problem with mesh generation. I set up the model and then mesh it. but when I want to run the study at first step it re-generate the mesh. I don't know what is the reason. my model...
View ArticleThermoelectric Effect - Adding the physics
Hello, I'm working in a project on thermoelectric generator. As 'Thermoelectric' physics interface,is not in the physics area/physics list, I was trying to add the physics using the steps given in the...
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 ArticleTransport of concentrated species, Membrane gas separation
I've attached simplified model describing transport of the one component through membrane. I've made it simple to make you catch a problem easily. In my advanced model I'm using Laminar Flow physics...
View ArticleShape optimization of radiating plate
Dear all, I'm currently optimizing the shape of a vibrating plate in an closed hollow cylinder filled with air to get an as straight as possible wavefront. I model it 2D axisymmetric and make use of...
View Articleelectromechanics
Hi, Can anybody tell me how to apply vaccum of 70-mtorr around my model clamped-clamped beam resonator.Something like keeping my model inside a chamber of vaccum.
View Articlemodel eye and its saccades
Hi, I'm trying to model the eye and have it oscillate about it's axis with an angular velocity. However, when I use moving mesh to create movement, I can't seem to get it to rotate about it's axis (the...
View ArticleNelder-Mead method in optimization module
Hello, I'm wondering if the Nelder-Mead method is also available in the optimization module? I can find it in the optimization node of a study, but not in the optimization module if it was added as...
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