A challenging test case for large eddy simulation: high Reynolds number circular cylinder flow

Unsteady RANS and detached-eddy simulations of flow around a circular cylinder in ground effect

“…A further difficulty for simulating the flow around a circular cylinder arises from the fact that the flow separation points are not fixed or determined by the geometry (Shur et al, 1996), in comparison with, for example, a square cylinder, for which the separation points are fixed at the two front corners and the flow can be reasonably predicted, at least in the mean sense, by URANS [with a special care to avoid the excessive production of turbulence in the front stagnation region, e.g., Kato and Launder (1993), Bosch and Rodi (1998); see also Section 3.3]. Some promising results of large-eddy simulations (LES) have been reported by Breuer (1998Breuer ( , 2000 on a circular cylinder in a uniform cross-flow (Re ¼ 3.9 Â 10 3 and 1.4 Â 10 5 , respectively), but an essential problem in the use of LES is again the computational cost required to sufficiently resolve the near-wall region, especially in high-Re cases. A possible alternative to LES is the detached-eddy simulation (DES), which is one of the hybrid methods that combine URANS and LES to obtain realistic solutions of practical high-Re flows at acceptable computational costs [Shur et al (1999); see also Breuer et al (2003) and Squires (2004) for recent progress on DES].…”

Reynolds number effects on flow over twisted offshore structure with drag reduction and vortex suppression

“…증되었다 (Ahmed and Bays-muchmore, 1992;Nebres et al, 1993;Chyu and Rockwell, 1996;Lam et al, 2004a;Lam et al, 2004b;Lee and Nguyen, 2007;Lam and Lin, 2008 (Unal and Rockwell, 1988;Prasad and Williamson, 1997;Norberg, 1998, Dong et al, 2006 (Breuer, 1998;Breuer, 2000;Jordan and Ragab, 1998;Jordan, 2002). (Keefe, 1962;Bishop and Hassan, 1964;White, 1974;Moeller, 1982;Moeller and Leehey, 1984;Norberg, 1987;Tadrist et al, 1990;Gopalkrishnan 1993 있다 (Unal and Rockwell, 1988;Prasad and Williamson, 1997;Norberg, 1998, Dong et al, 2006.…”

A Complementary Numerical / Experimental Investigation on the Flow over Periodic Hills at 100 ≤ Re ≤ 10.595

“…For modeling the non-resolvable subgrid scales, two different models are implemented, namely the Smagorinsky model (1963) with Van Driest damping near solid walls and the dynamic approach by Germano et al (1991). For more information please refer to [1,2].…”