Output pressure of the transducer in frequency domain
Hello,everyone I'm doing research in capacitive ultrasonic transducer. I use the electromechanic model and want to observe the output pressure in the frequency domain. Now I can add the biased voltage...
View ArticleGravity volume force in non-isothermal laminar flow
Hello I'm trying to simulate non-isothermal laminar flow through a tube, and I use 2D-axisymmetrical to decrease the computing time. The model works fine with laminar flow and heat transfer, but when I...
View Articleconnecting solid and beam elements.
Hi, how can I use the beam element to act as a shear connector between two solid elements.
View ArticleEquation Based Modeling in structure mechanics
Hi All, While solving equation based structure mechanics problem i encountered the following error message- - Undefined value found. - Detail: Undefined value found in the stiffness matrix. -There are...
View ArticleEigenfrequency Problem
Good evening, I'd like to know if there's a way to find the highest, maximum , eigerfrequency of a structure using COMSOL.
View Articlechanging boundary cond. with time
Hello, I want to ask for advice how to change boundary condition in time. E.g. I have exact temperature on boundary for 3600 sec. and after this time, I want to change this boundary to insulation. I've...
View ArticleProblem with meshing in a microfluidic channel.
Hey all, I am trying to simulate the deflection of a half-sphere, with ALE Fluid-structure interaction, stuck on the bottom surface of a microfluidic channel (height = 50 um and width = 300 um) and it...
View Articlenegative concentrations with high reaction terms in biokinetic models
Hi, I am using a biokinetic model based on the ASM (activated sludge models) to simulate water contaminant removal in a gravel filter. This kind of models consider the degradation of the influent...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View ArticleHow to set initial velocity in level-set method two phase flow for one phase
Hi guys, I am trying to set the initial velocity for a droplet as fluid 1, how can I set an initial velocity for the bulk of fluid (for example the the continuous phase or the drop) in level set...
View ArticleControlling my own boundaries
I am modelling a closed tube of air in 3D with a heating plate at one end of the tube. I have measured the temperature distribution across the heating plate as a function of time and location and would...
View ArticleSimulation of leakage flux from transformer
Hello. I've tried to simulate a quantity of leakage flux from transformer by using COMSOL 4.3a. To do this, I made a simple transformer model with LiveLink for AutoCAD.(I want to attach mph file, but...
View ArticleHarmonic Load
Hey, I'm new to COMSOL and I have a few questions about it. I'd like to do a Frequency Response Analysis of a structure with a harmonic load ''shaking'' it with a pre-determined force and frequency ,...
View ArticleTemperature dependent creep analysis!!
Dear all, could you share your knowledge on temperature dependent creep analysis!! I’m using COMSOL 4.3a to see deformation pattern. In this model, I apply Linear Elastic Material with Norton creep...
View ArticleHow can I find the flow velocity of a specific coordinate point
Dear all, I would like to ask how can I find the flow velocity of a specific point (x=105, y=2.5) in my channel (it is shown in the picture). In the graph, if I click at any random point I got 3...
View ArticleType in the divergence of a gradient, manually.
Hi, I am trying to model some thermo diffusion where I need to type: div(-“factor”*grad(temperature) ) , manually. Does anyone know where to find perhaps a list of the syntax for these operators? Thank...
View ArticleAutomatically parameter increasing
Dear friends, I have a simple 2D rectangular model, I want to measure some acoustic properties in my desired frequency range, for specific height of model it's easy, but I want to check a range of...
View ArticleAdapative Mesh Refinement with Mapped Distribution
Hello, I'm using Comsol version 4.3 and, for some reason, when I try to use adaptive mesh refinement in the Stationary Solver's extensions, it claims I can only use triangular mesh elements for it. I...
View ArticleWarning: Edge is much shorter than the specified minimum element size.
I am trying to mesh a 3D integrated concrete masonry block. The geometry is somewhat complex but the idea is that it is a layered apparatus: brick, foam, brick. I am trying to measure the R-value of...
View ArticleMagntic field analyses using current excitation
Hello, I have started to use Comsol this week and have done some examples, but when I try to simulate my model I hit some set backs. The model has 16 electromagnetic poles with a pair of coils in...
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