Abstract
Consider a rigid body, \({\mathscr {B}}\), constrained to move by translational motion in an unbounded viscous liquid. The driving mechanism is a given distribution of time-periodic velocity field, \({\varvec{v}}_*\), at the interface body-liquid, of magnitude \(\delta \) (in appropriate function class). The main objective is to find conditions on \({\varvec{v}}_*\) ensuring that \({\mathscr {B}}\) performs a non-zero net motion, namely, \({\mathscr {B}}\) can cover any given distance in a finite time. The approach to the problem depends on whether the averaged value of \({\varvec{v}}_*\) over a period of time is (case (b)) or is not (case (a)) identically zero. In case (a) we solve the problem in a relatively straightforward way, by showing that, for small \(\delta \), it reduces to the study of a suitable and well-investigated time-independent Stokes (linear) problem. In case (b), however, the question is much more complicated, because we show that it cannot be brought to the study of a linear problem. Therefore, in case (b), self-propulsion is a genuinely nonlinear issue that we solve directly on the nonlinear system by a contradiction argument. In this way, we are able to give, also in case (b), sufficient conditions for self-propulsion (for small \(\delta \)). Finally, we demonstrate, by means of counterexamples, that such conditions are, in general, also necessary.
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Notes
A detailed analysis of homogeneous Sobolev spaces including their main properties can be found in [8, Section II.6].
We use summation convention over repeated indices, unless confusion may arise.
Possibly, by modifying \(\tau \) by adding to it a suitable function of time.
For simplicity, we set \(\varvec{\xi }_{{\varvec{u}}_n}\equiv \varvec{\xi }_n\), \(\varvec{\chi }_{{\varvec{w}}_n}\equiv \varvec{\chi }_n\).
Notice that \({\mathcal V}_\sharp ^{2,\frac{3q}{3-q}}\subset {\mathcal V}_\sharp ^{2,q}\).
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Acknowledgements
I would like to thank Mr. Jan A. Wein for sharing several conversations on the topic of self-propulsion.
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Galdi, G.P. On the Self-propulsion of a Rigid Body in a Viscous Liquid by Time-Periodic Boundary Data. J. Math. Fluid Mech. 22, 61 (2020). https://doi.org/10.1007/s00021-020-00537-z
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DOI: https://doi.org/10.1007/s00021-020-00537-z