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Dynamic Data Extension
Posted Jan 27, 2017, 12:00 p.m. EST Acoustics & Vibrations, Results & Visualization Version 4.4 1 Reply
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Hello,
I'm interested in the inner workings of the dynamic data extension feature for creating animations. It's a very useful tool for visualizations and it works great, but I'm wondering about the computation processes that COMSOL uses to create the dynamic graphics.
I have two models using the eigenfrequency study in acoustics module. One is a simple standing wave tube, the other is the same tube with a feedback loop which results in a traveling acoustic wave. The dynamic data extension animations show the two wave types very clearly, however from the data that I am able to export (amplitude of the acoustic pressure as a function of position in the tube) it is impossible to determine whether the wave is standing or traveling (since there is no information about evolution of the wave over time).
I was hoping to learn more about how COMSOL is able to generate an accurate time dependent animation in a frequency domain study. Thanks in advance. I'm new to the software so any help is appreciated.
I'm interested in the inner workings of the dynamic data extension feature for creating animations. It's a very useful tool for visualizations and it works great, but I'm wondering about the computation processes that COMSOL uses to create the dynamic graphics.
I have two models using the eigenfrequency study in acoustics module. One is a simple standing wave tube, the other is the same tube with a feedback loop which results in a traveling acoustic wave. The dynamic data extension animations show the two wave types very clearly, however from the data that I am able to export (amplitude of the acoustic pressure as a function of position in the tube) it is impossible to determine whether the wave is standing or traveling (since there is no information about evolution of the wave over time).
I was hoping to learn more about how COMSOL is able to generate an accurate time dependent animation in a frequency domain study. Thanks in advance. I'm new to the software so any help is appreciated.
1 Reply Last Post Jan 27, 2017, 3:52 p.m. EST
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Posted:
8 years ago
Jesse,
the dynamic data extension can only show you the quantities along a harmonic cycle. There is just no time in the frequency domain. If you want to see temporal phenomena you have to run a time dependent study.
In case you have a frequency sweep you can transform to time domain by an FFT.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
the dynamic data extension can only show you the quantities along a harmonic cycle. There is just no time in the frequency domain. If you want to see temporal phenomena you have to run a time dependent study.
In case you have a frequency sweep you can transform to time domain by an FFT.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com