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updated Lagrangian formulation
Hi, all, I am curious how to activate the updated Lagrangian for the calculation of the internal stress of a compressed body. I attached my comsol model. Because of the file size, I just attached the...
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Planar RF inductor
I need to find S-parameter for an on-chip inductor. I am finding difficulty in defining the input and output ports (which type of port should i select 'lumped port' or 'normal port'), and how to define...
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Coupling Matrix, Elasticity Matrix, Relative Permitivity
Hi, Im new to COMSOL, im designing a Piezoelectric sensor using PZT 5H. I have used the high strength alloy steel for the rails and nylon as the base substrate on which the piezoelectric material is...
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some problems in my software COMSOL5.2
I am learn from the cases in the official web, in a case, the guide said I should choose "circle" in the "geometory". But there is not the "circle" in the "geometory" in my software. thank you!
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Modelling a sound wave in helmholtz resonator
Hello, I hope someone can help me out with the following. For my graduation project I am looking at the effect of (adding) friction in the neck of a helmholtz resonator. I would like to model this in...
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Where to write notes
Hi, it comes up often enough that I'd like to write notes and save them with the COMSOL input file: could be small comments associated with a variable, or maybe a slightly longer (TeX ?!) file with...
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How can I model magnets attracting each other?
I want to make an animation in 2D. As far as I can see on COMSOL models there is no such kind of tutorial. Actually this is the thing that I want to do; "br.comsol.com/community/exchange/321/" .
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Why does the differential operator d(f,x) always give a zero result?
I was using the semiconductor module to do device simulation. After the distribution of electrical potential V had been computed, a contour of V could be plotted. But if I typed d(V,x) into the...
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time of running
Hi i just want to know how can i know how much time my model takes until arrive to final results. it is very important things for me to compare with time of running until arrive to final results thank you
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no mesh on domain
Hello, i have a problem. i wanna compute my 3D object, but there is an error /warnings warning: No mesh on domains 1 3 5 7 in geometry 1, mesh case 0. No mesh on domains 2 6 in geometry 1, mesh case 0....
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displaying results
Hi I have a small problem when displaying results. During the simulation, I found that the variation curves move and away from t = 0 and I see only the change to an intermediate interval. So when the...
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Does version 5.0 with matlab contains function like flim2curve and loft...
We were using version 3.5a from ling time to make MRI image model segmentations with matlab. now, we are thinking to update version to 5.0 . so I would like to know I it possible to use similar...
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COMSOL Heat transfer
Hello, I am a beginner in COMSOL. I like to work on HEAT TRANSFER MODULE. I have found a paper on Thermoelectrics called "Multiphysics Simulation of Thermoelectric Systems - Modeling of Peltier-...
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Use of an SSD?
I run COMSOL on a core i7 with 32GB. Occasionally I run out of memory, and things get VERY slow. Now more RAM is clearly best. But how much benefit would there be in installing an SSD and using it for...
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Can i make the coil current in the single-turn coil a negative number??
Hi! I simulate a 2-D modle.There are two single-turn coils that is series connection. The parameters of the coils are all same except their coil currents are contrary.So i should make a one coil's...
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How to plot the electric field of circular polarized light?
Hello I simulate a meta-surface model when a circular polarized light is normal incident, the polarization state of transmitted light is circular polarized too, and how can I plot the transmitted...
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How to use the solution of Study 1 to Study 2? (Initial Condition of the...
Hello! I am modeling a conjugate heat transfer problem. It is a closed channel flow of air and a thin liquid film at the bottom surface. In comsol model, first I like to add study for steady state case...
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Iterative solver for Forchheimer flow
Dear all, I am relatively new to COMSOL so please bear with me. I have made a simple axysmmetric model with an inlet on the left hand side and an outlet on the right. The flow between the two has to be...
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File input trouble (Unknown Variable)
Hello, in my simulation, I am trying to use some telemetry data formatted into an Excel spreadsheet. The first column has time data and the second has corresponding Wattage from a heater. Under Global...
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Assign pressure signal to nodes, other approach in COMSOL?
Hello together, I am quite new in using COMSOL and I encountered a problem. I have done a simulation with another FEM program and I saved the nodal values for the acoustic pressure along a certain...
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