A direct numerical simulations (DNS) of a spatially evolving particle-laden turbulent boundary layer has been performed to study turbophoresis effects in presence of changing local Stokes number. The data show a preferential particle localization near the wall at the streamwise position where the local Stokes number St + assumes a value close to 25, similarly to that found in channel flow. Note that a complete steady state will never been reached for the particle concentration in this kind of flow. The effects of the seeding and of preferential sampling of the fluid velocity will be described as well.
Transport of inertial particles in turbulent boundary layers / Sardina, Gaetano; Luca, Brandt; Philipp, Schlatter; Casciola, Carlo Massimo; Dan S., Henningson. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - STAMPA. - 318:SECTION 5(2011), p. 052020. (Intervento presentato al convegno 13th European Turbulence Conference, ETC13 tenutosi a Warsaw nel 12 September 2011 through 15 September 2011) [10.1088/1742-6596/318/5/052020].
Transport of inertial particles in turbulent boundary layers
SARDINA, GAETANO;CASCIOLA, Carlo Massimo;
2011
Abstract
A direct numerical simulations (DNS) of a spatially evolving particle-laden turbulent boundary layer has been performed to study turbophoresis effects in presence of changing local Stokes number. The data show a preferential particle localization near the wall at the streamwise position where the local Stokes number St + assumes a value close to 25, similarly to that found in channel flow. Note that a complete steady state will never been reached for the particle concentration in this kind of flow. The effects of the seeding and of preferential sampling of the fluid velocity will be described as well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
