The Influence of a Background Flow on Acoustic Streaming
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2017 IEEE International Ultrasonics Symposium, IUS 2017
Acoustic streaming effects are usually treated using perturbation theory by writing the field variables as perturbation expansions utilizing a small scale parameter and solving the ensuing equation systems. When conducting numerical simulations, this approach can help reducing the computational effort drastically. In most cases, the zero-order velocity is assumed to be zero, which is an applicable assumption, if the fluid is considered to be at rest in the unperturbed state. If this assumption is not fulfilled, the zero-order velocity has to be taken into account in the calculation. In this contribution we investigate the influence of such a
background velocity field on the resulting acoustic streaming flow by finite element analysis. The zero-order velocity is therefore included in a numerical simulation scheme, which is based on perturbation theory. The impact of the zero-order velocity is investigated in two examples taken from literature.