<div dir="ltr">Segnalo questo seminario online organizzato dal Politecnico di Milano.<div><br>Cordiali saluti,</div><div>Stefano Lisini.<br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><div dir="auto"><div dir="ltr">
Inizio messaggio inoltrato:</div>
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<div dir="ltr">Si avvisa che in data 24/3/2021, alle ore 15:15 precise, Url: <a href="https://polimi-it.zoom.us/j/87365124649?pwd=SjZOcDgrQU9qUGZCM3FZRmxCTUhlUT09" target="_blank">
link</a> , nell'ambito delle iniziative della sezione di Analisi, si svolgerà il seguente seminario:<br>
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Explicit bounds for the generation of a lift force exerted by steady-state Navier-Stokes flows over a fixed obstacle<br>
Gianmarco Sperone, Dept. of Mathematical Analysis, Faculty of Mathematics and Physics, Charles University in Prague<br>
We analyze the steady motion of a viscous incompressible fluid in a two- and three-dimensional channel containing an obstacle through the Navier-Stokes equations under different types of boundary conditions. In the 2D case we take constant non-homogeneous Dirichlet
boundary data in a (virtual) square containing the obstacle, and emphasize the connection between the appearance of lift and the unique solvability of Navier-Stokes equations. In the 3D case we consider mixed boundary conditions: the inflow is given by a fairly
general datum and the flow is assumed to satisfy a constant traction boundary condition on the outlet. In the absence of external forcing, explicit bounds on the inflow velocity guaranteeing existence and uniqueness of such steady motion are provided after
estimating some Sobolev embedding constants and constructing a suitable solenoidal extension of the inlet velocity. In the 3D case, this solenoidal extension is built through the Bogovskii operator and ex! plicit bounds on its Dirichlet norm (in terms of the
geometric parameters of the obstacle) are found by solving a variational problem involving the infinity-Laplacian. The talk accounts for results obtained in collaboration with Filippo Gazzola and Ilaria Fragalà (both at Politecnico di Milano)<br>
Link: <a href="https://polimi-it.zoom.us/j/87365124649?pwd=SjZOcDgrQU9qUGZCM3FZRmxCTUhlUT09" target="_blank">https://polimi-it.zoom.us/j/87365124649?pwd=SjZOcDgrQU9qUGZCM3FZRmxCTUhlUT09</a><br><br></div></blockquote></div></div></div></div>