restricted stress in time dependent problem
Hello evrybody, I m using a time dependent problem of a beam restricted at both ends. When we apply voltage or temperature, it produces stress greater than 500 MPa. Can anyone help me how to restricted...
View Articlevector form variables in PDE
What is the procedure to specify a dependent variable in PDE interface to be a vector rather than a scalar? In more specific terms, I'm trying to implement the vector wave equation in 3D using the...
View ArticleNeed Help: Solder Joint Estimation of Flip Chip
Dear All I'm a new for COMSOL. the case that i'm facing is a flip chip process. after read several samples, still could not figure it out what model/physics should to be used. hope to get some help...
View ArticleDeravites in 2D-axisymmetric models
Hi guys, I was wondering if we should add any extra parts for calculating the derivative of a variable in 2D-axisymmetric models? Under Definition ----Variables--If the goal is to define a new variable...
View ArticleDefining port, identity pair and PML layer
Dear Friend, Currently i am using comsol 4.3 version, i am totally new about it. could you suggest me how can i define port i,identity pair and also PML at same time in my model. it was works nicely in...
View Articlesome problems about cantilever under Electrostatic force + contact
Hi, When I simulate cantilever bending under electrostatic force with COMSOL, there are some problems and errors I can not fix. Could someone please give me advises? I attach my file. (1) When the...
View ArticleHow to calculate the water saturation in the period of water injection to...
I just start to learn COMSOL4.2a.I want to simulate the process of water injection in oil production. Two phase darcy flow is applied in reservior.When water is injected to the reservior at the...
View ArticleDerivative of Interpolation Functions
Dear all, I am trying to understand if, given an interpolation function (defined by a table of points in an external file like *.txt file) it is possible to define the derivative (spatial) of the...
View ArticlePolynomial Issue with User-defined Variables
I have a 2D rectangular geometry that has porosity and permeability values dependent on x-coordinate. Polynomial expressions are used to define the local porosity and permeability. However, COMSOL does...
View ArticleMeshing and convergence problems
Dear Comsolians, I was finally able to draw the problem in 3D in Comsol :), am also a beginner, lol. The way I have modeled the coils is that they do not form a complete closed loop, thus I assigned...
View ArticleCylindrical anisotropic stiffness
Hi, Problem: Imagine a cylindrical shell, with a certain wall thickness. The material properties of the shell have an isotropic density (rho) and an anisotropic stiffness described by a constant radial...
View ArticleMeaning of "node" vs. "vertex" vs. "degree of freedom" for linear finite...
Hi there, can anybody tell me what COMSOL means by the word "node" in contrast to "vertex" or "degree of freedom" when it comes to the discretization? I have...
View ArticleSplit solid into two domains
Hi, I have a 3D model that I've imported into COMSOL. In Solidworks, I have two features that are separate, however, when imported into COMSOL, they become a single domain and a single geometry...
View ArticleUrgent (RF)
Hello, I am having a deadline in less than a month and I need really your help. I am trying to build an RF model with a layer of graphene that is going to be shined by light from different angles. I am...
View Articlesimulating moving piston
There are 4 components in my model; blood, blood vessel, brain tissue, and piston Blood and blood vessel are surrounded by brain tissue and piston crushes down brain tissue with 1mm depth. When I used...
View ArticlePipe flow module for turbulent flow in the pipe
Hi all, I have just discovered the brand new pipe flow module. it looks amazing. I was wondering if this module is suitable for turbulent flow in the pipe as well. I haven't seen anything regarding...
View ArticleTime Dependent Study of an Airfoil- Lift Coefficient
Hi, I am trying to learn how to calculation the lift and drag coefficient of an airfoil running a time-dependent study. Below are the boundary conditions. Re ~2000 Inlet- Inlet U*step1(t[1/s]) Top and...
View ArticlePloting ?
Hi, How do I control my plots? window size, fonts size, label positioning? I miss on a 2D-surface plot with height-expression the labels on my axis? the snapshot window is too small whenever i want the...
View Articledesign and analysis of 2d single axis capacitive accelerometer
hi, While assigning the material air for domain i am getting the error in material contents for young"s modulus and poisson's ratio i.e it is showing stop signal. please can u explain me this error....
View ArticleGraph vs Phase with Frequency Domain Solver?
Hello, Im sure this is pretty simple, but im still learning COMSOL 4.1. Im using a frequency domain solver, and I have a solution, I can build a video across a full harmonic, with the dynamic data...
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