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No eigenpair solution selected
Hi I'm new in COMSOL. I want to find out eigenfrequencies of a pinned-pinned rectangular concrete beam. this beam has 5X5 cm cross section. It is a simple problem but I have some problems in getting...
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Simple supported boundary condition in Comsol
Hi, guys. I'm actually studying cylindrical sound diffusers using Comsol 4.3a and I need to add simply supported boundary conditions. Is there any way to do it? I have noticed there's several...
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Setting initial values for an iterative solver
Comsol user interface shows some options for setting initial values at the stationary study step at 'Initial values of variables solved for'. These are either zero or a solution - but we want to set...
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Diffraction on an isolated line
hello everyone, I have a problem. now I want to simulate the diffraction for an isolated line, and I want to observe the intencity of different diffraction orders, both transmitted and reflected....
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Piezoelectric Eigenfrequency analysis - Decay factor - Understanding results
Hi, I carried out successfully an eigenfrequency analysis of a piezoelectric structure and now I need some help in understanding the meaning of the results. These are the six eigenfrequencies that I...
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CFD - Surface roughness
Hey guys I really need your help on this one! I was wondering if any of you could tell me about the default settings of surface roughness's in COMSOL? All I've found about it in the documentation is...
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Why does COMSOL lead to zero solution for a high-order PDE?
Dear all, I'm trying to solve a system of PDE, where the highest order is 4. COMSOL supports finite elements of 5th order. So solving the equation system should be possible by using COMSOL. But the...
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where can we find the parametric symbols of different variables????
Hello Friends, Am a beginner to Comsol Multiphysics and i find difficulty in knowing the parametric symbols being used in modeling!!! Thank you.
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How prevent an object from penetrating another object?
The attached file has a simple case that is a precursor to what I really need to model. The simple case consists of a membrane (hyperelastic material model) with a small quartz bead located a short...
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Multiple input ports in RF problems
Hello, I'am doing a simulation with RF module. It's about the mode analysis of a rectangular silicon waveguide. There are two waveguides. To propagate the monochromatic light of 1550nm (1.935e14 Hz ),...
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Initial condition for time dependent study
Hi, I'm trying to model free vibration of a small PZT cantilever (MEMS). I need to apply some initial conditions on displacement in a time dependent study. How can i do it? Thanks Andrea
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DEP Model using Comsol 4.3
Hello, I am trying to do a DEP simulation in Comsol 4.3 and I want to apply an AC signal of 10V 14KHz in a pair of electrodes. I am presently using AC/DC model. I am able to apply a DC signal but I am...
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Boundary Interaction?
I am currently working on a model that uses the Heat Transfer in Fluids module in the lower domain to simulate the performance of a Metal Hydride that is absorbing heat by a given reaction. The part of...
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Show which computer is using a license
We have a network license for COMSOL 4.3a. This is a fairly large laboratory setting. People here have a bad habit of leaving COMSOL open on their workstations when they go home for the day, locking up...
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EFFECTIVE INDEX
Hi eveybody. Actually I am trying to plot effective index of PCF with variation of diameter in COMSOL.I could not know how to put the diameter values and where to put.Please help me in this regard.I am...
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Zero stress boundary
Hey everyone, I'm trying to figure out how to model and find the motional eigenfrequencies of a totally free cylinder. That is the requirement as I see it is to have zero stress on all surfaces while...
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Using interpolation tables for temperature dependent structural and themal...
This will eventually be an analysis of the thermal and structural very steep pulses but for now I am keeping it simple. (stationary and moderate time dependent loads) In trying to defining some basic...
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VCCS
Dear all, I simulating a 3D electrode model and do not know how to use voltage controlled current source (VCCS) under electric circuits (ec). Can anyone help me where can I find examples using the...
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AC sources
Hi All, I am working on a project using comsol and I need to define an AC source. I want to use the Ac source to see the effect of bioheating. I don't know how to define an AC source and how to use...
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No eigenpair solution selected
Hi I'm new in COMSOL. I want to find out eigenfrequencies of a pinned-pinned rectangular concrete beam. this beam has 5X5 cm cross section. It is a simple problem but I have some problems in getting...
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