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Pré-Publication, Document De Travail Année : 2015

Time optimal swimmers and Brockett integrator

Résumé

The aim of this work is to compute time optimal controls for micro-swimmers. The action of swimming is seen as a control problem. More precisely, given an initial position and a target position, can the swimmer move to the target by changing its shape. The motion of the swimmer in the fluid results from the fluid-structure interaction. For micro-swimmers, the fluid equations in consideration are the stationnary Stokes equations. The way of swimming can be described by the following steps: 1. the swimmer modifies its shape, 2. this modification creates a velocity field in the fluid, 3. the fluid velocity acts on the swimmer as a force, 4. the fluid force moves the swimmer. Of course things are not so distinct and the swimming is a highly coupled nonlinear control problem. In this note, we present some key results for a fast numerical method to compute time optimal controls for axi-symmetric micro-swimmers. This numerical method is based on explicit formulae of time optimal controls for the Brockett integrator which is a system approaching the dynamic of the swimmer.
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Dates et versions

hal-01164561 , version 1 (17-06-2015)

Identifiants

  • HAL Id : hal-01164561 , version 1

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Jérôme Lohéac, Jean-Francois Scheid. Time optimal swimmers and Brockett integrator. 2015. ⟨hal-01164561⟩
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