Modeling an acoustic t-junction
Hello, I am currently trying to model an acoustic t-junction with the frequency domain acoustic pressure module. But while the 3D simulation gives me reasonable results I only get nonsense from the 2D...
View ArticleTotal Mass of a Structure
Hello, I was wondering how to extract the total mass of system. I have solids model of a beam and a beam model of a beam. I wanted to compare their total masses to each other. Any help would be greatly...
View ArticleDefining constraint
Hello friends, I would really appreciate some help in defining a constraint. I am trying to solve a system of PDEs but the result at the earlier times keep overshooting the expected value. The maximum...
View ArticleIs there any relations between the "1D axial symmetry" and "spherical...
Hello everyone. I am quite confused by the "1D axial symmetry geometry". To my understanding, "1D axial symmetry geometry" actually represents the spherical coordinate. For example, line in "1D axial...
View Articlestop criterion adaptive mesh refinement
Hi, I have a question concerning the stop criterion of the adaptive mesh refinement (adaptive solver) algorithm: In the Reference Guide stop criterion is only described by: “Terminate execution if it...
View ArticlePML Implementation
Hi all, I generally have a PML implementation issue. I simulate my wave equation in a 2D weak PDE form, namely -ux*test(ux)-uy*test(uy)+k^2*u*test(u) in a square region. Outside are the PML domains. So...
View ArticleSet the coordinates of nodes via matlab
Hi, I'm using Livelink with matlab and I'm trying to define my model using matlab software. Everything for me seems quite clear, except one thing. Firstly I create the geometry using following comands:...
View Articlehow to get the average values on parallel channels
Hello everybody. Now I simulate the hydynamics of the distributor with parrallel channels. I want to get the mean velocity values in the middle of each channels. I try to use the 'cut plane' on the...
View ArticleSurface evaporation, condensation
Hi, I want to model surface evaporation from a water flow at 40 Celsius and observe the consequent condensation on a cold surface. Can you help me with the model that I should use? I could not find...
View ArticleDiscussion Forum now Supports LaTeX Equations
Hi, We have just implemented the support of being able to communicate your mathematical equations using LaTeX formula entry. This is described in the 'Help' section, by clicking on the Help button or...
View ArticleReverse Joule Heating
Hi. I'm doing a model of a HV power cable, that heats up due to the current flowing through it. I know that the temperature of the isolation material can not exceed 90degC so i want to figure out how...
View ArticleImport geometry from Matlab into Comsol
Hello, First of all, I want to emphasize that I am a beginner with Comsol. I am trying to import a geometry generated with Matlab into Comsol in order to study the wave propagation in this geometry. My...
View Articlemodeling sessile droplet evaporation
Dear Firends, does any one has experience with modeling phase change from liquid to gas ? is there exists any tutorial ? I intended to model evaporation of single droplet pinned of relatively hot...
View ArticleFSI error : segregated solver
Dear All, I am trying to work with FSI simulation of Blood-flow in an artery using a coupling of the Laminar Fluid flow and the Solid Mechanics Interface.But my solution-progress is stuck around 10% (...
View ArticleMW Equations + Phase Change in 4.2
Hi, I am using microwave heating option of the RF module for heating a mixture of oil and water.Can any body let me know which set of equations COMSOL is using to solve the microwave heating problem? I...
View ArticleTriaxial Test
I have studied the triaxial test example, "axisymetric" case, which is CU (Consolidated Undrained).This means no variation of pore pressure in the soil. And, how to proceed if one needs to take account...
View Articlehow to understand the code of comsol in matlab editor.
how can i understand the code of programme that is developed with the help of COMSOL and saved as m file and now it is obtained in COMSOL MATLAB editor. how to get to know the curve it shows belongs to...
View ArticleCan someone help me understand this error?
I need help understanding the cause of the following error:"Failed to compute elastoplastic strain variables" I have received this error numerous times in a few different structural models where I am...
View ArticleDiode example solved but strange
Hi I tried to solve the semiconductor diode example from the model library but simplifying it a bit. In particular, I discarded the rounded corner and just made it a text book like pn-junction. It...
View Articlemultiphase flow with moving interface combined with diffusion
I'm working on a simulation of two droplets in air coalescing into one combined droplet in which I want to follow in time the mass transport of a species C in one droplet into the coalesced droplet....
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