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BAIL 2006 Book of Abstracts - Institut für Numerische und ...

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W. LAYTON, I. STANCULESCU: Numerical Analysis <strong>of</strong> Approximate Deconvolution<br />

Models <strong>of</strong> Turbulence<br />

✬<br />

✫<br />

Numerical Analysis <strong>of</strong> Approximate Deconvolution Models <strong>of</strong><br />

Turbulence<br />

William Layton ∗ and Iuliana Stanculescu †<br />

Abstract<br />

If the NSE are averaged with a local, spacial, convolution type filter the resulting<br />

system is not closed due to the term g ∗ (uu). A deconvolution operator GN is one<br />

which satisfies:<br />

u = GN(g ∗ u) + O(δ 2N+2 ) (0.1)<br />

where δ is the filter width. This yields the closure method:<br />

g ∗ (uu) = g ∗ (GN(g ∗ u)GN(g ∗ u)) + O(δ 2N+2 ) (0.2)<br />

We will review several solutions to the ill-possed deconvolution problem, present<br />

an ”optimal” deconvolution procedure and present numerical analysis and numerical<br />

experiments with it.<br />

∗<br />

Department <strong>of</strong> Mathematics, University <strong>of</strong> Pittsburgh, Pittsburgh, PA,15260, U.S.A.; email:<br />

wjl@pitt.edu, www.math.pitt.edu/˜wjl<br />

†<br />

Department <strong>of</strong> Mathematics, University <strong>of</strong> Pittsburgh, Pittsburgh, PA,15260, U.S.A.; email:<br />

ius1@pitt.edu, www.math.pitt.edu/˜ius1<br />

Speaker: STANCULESCU, I. 18 <strong>BAIL</strong> <strong>2006</strong><br />

1<br />

✩<br />

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