European Turbulence Conference 2015

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12:15
15 mins

DIRECT NUMERICAL SIMULATION OF AN EQUILIBRIUM ADVERSE PRESSURE GRADIENT TURBULENT BOUNDARY LAYER AT THE VERGE OF SEPARATION
Vassili Kitsios, Callum Atkinson, Juan Sillero, Guillem Borrell, Ayse Gungor, Javier Jimenez, Julio Soria

Session: Wall-bounded flows 6
Session starts: Friday 28 August, 10:30
Presentation starts: 12:15
Room: Room B

Vassili Kitsios (Monash University)
Callum Atkinson (Monash Univeristy)
Juan Sillero (Universidad Politécnica de Madrid)
Guillem Borrell (Universidad Politécnica de Madrid)
Ayse Gungor (Istanbul Technical University)
Javier Jimenez (Universidad Politécnica de Madrid)
Julio Soria (Monash University)

Abstract:
The statistics and structure of a self-similar equilibrium adverse pressure gradient (APG) turbulent boundary layer (TBL) are investigated using a direct numerical simulation (DNS) of the flow at the verge of separation. Flow simulations are performed using the DNS TBL code of Simens et al. [8] and Borrell et al. [1] with the desired equilibrium APG achieved via the use of a tailored far-field boundary condition. The APG TBL develops over a momentum thickness based Reynolds number of Reθ ≈ 2000 to 6000, achieving a region of constant friction coefficient (Cf ), pressure velocity (up) and shape factor (H). One- and two-point statistics are presented under both inner wall (uτ ) and pressure velocity (up ) based scaling.