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Modeling the vibration of microbubbles in Thermoviscous Acoustics

Posted Nov 19, 2025, 4:19 a.m. EST Acoustics & Vibrations, Studies & Solvers, Physics Interfaces Version 6.3 2 Replies

Ali Kheirkhah Barzoki
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Hello,

I am trying to simulate the acoustic streaming around a microbubble under acoustic actuation. To do so, I coupled Pressure Acoustics with Thermoviscous Acoustics and defined surface tension at the bubble interface. First, I did Eigen study and found the resonant frequency. Then, I did frequency domain study at the resonant frequency I found, and use the results of the frequency domain study in a stationary study for Laminar flow to see the acoustic streaming. The problem is that the simulation result doesn't match the experiments. When I check the mode shapes of the bubble interface in Eigen study and Frequency domain study, they are not the same, while I think they must be the same because they are at the same frequency.

Can somebody help me with this contradiction?

Best, Ali

2 Replies Last Post Nov 21, 2025, 3:33 a.m. EST
Acculution ApS Certified Consultant
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Posted: 6 months ago Nov 21, 2025, 2:12 a.m. EST

Don't know anything about bubbles, or why the experiment data does not fit with the modeled data, but in general I would not expect the eigenshape to 'look' the same as the forced response, unless it is forced in a very particular way, even at the same frequency.

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René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Don't know anything about bubbles, or why the experiment data does not fit with the modeled data, but in general I would not expect the eigenshape to 'look' the same as the forced response, unless it is forced in a very particular way, even at the same frequency.
Edgar J. Kaiser Certified Consultant
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Posted: 6 months ago Nov 21, 2025, 3:33 a.m. EST

Hi Ali,

there is some analytical work about bubbles by Minnaert: https://en.wikipedia.org/wiki/Minnaert_resonance

I was doing some work with bubbles and was only using pressure acoustics. We were only considering the fundamental spherically symmetric mode. Agreement with theory was pretty good. We weren't doing measurements though.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Ali, there is some analytical work about bubbles by Minnaert: https://en.wikipedia.org/wiki/Minnaert_resonance I was doing some work with bubbles and was only using pressure acoustics. We were only considering the fundamental spherically symmetric mode. Agreement with theory was pretty good. We weren't doing measurements though. Cheers Edgar

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