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Physique des écoulements turbulents - Centre Acoustique du LMFA ...

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17<br />

A short intro<strong>du</strong>ction to turbulent flows <br />

Couche limite laminaire : solution autosimilaire de Blasius (1908)<br />

δ<br />

x1<br />

≃ 4.92<br />

δ ≃ 4.92<br />

1<br />

Rex 1<br />

νx1<br />

Ue1<br />

x 2 /δ<br />

1.5<br />

1.0<br />

0.5<br />

Coefficient de frottement local,<br />

Cf = τw<br />

1<br />

2 ρU2 e1<br />

0.0 0.2 0.4 0.6 0.8 1.0<br />

U /U<br />

1 e1<br />

∼ µU<br />

δ<br />

ρU<br />

2 ∼ ν<br />

δU<br />

∼ 1<br />

Re 1/2<br />

L<br />

<strong>Physique</strong> <strong>des</strong> <strong>écoulements</strong> <strong>turbulents</strong> @ Christophe Bailly – ECL’12<br />

H. Blasius (1883-1970)<br />

Cf ≃ 0.664<br />

Rex 1

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