DNS of Separated Flow: Scale-by-Scale Analysis
The Direct Numerical Simulation (DNS) of a turbulent channel containing a bump is carried out to study the turbulence dynamics in the separated region. Our study is intended to fill the gap among the idealised conditions, e.g. plane channel flows typically addressed in literature and the actual flow geometries where the effects of wall curvature and the presence of bluff bodies immediately generate a substantial separated flow region in the bulk of the flow and produce turbulent wakes behind the bluff body. Such configuration allows retaining, with the minimum level of complexity, all the basic features of separated wall-bounded flows such as the presence of the recirculating region that acts as the main energy source for the turbulent velocity fluctuations in the bulk of the flow and in the wake behind the bump.
The research leading to these results has received funding from the European Research Council under the ERC Grant Agreement no. 339446. PRACE, under grant no. 2014112647, has awarded access to resource FERMI based in Bologna, Italy.
- 2.Thiesset, F., Danaila, L., Antonia, R.A.: A look at the turbulent wake using scale-by-scale energy budgets. Fluid-Struct.-Sound Interact. Control (2014)Google Scholar
- 4.Casciola, C.M., Gualtieri, P., Benzi, R., Piva, R.: Scale-by-scale budget and similarity laws for shear turbulence. J. Fluid Mech. 476, 105–114 (2003)Google Scholar
- 7.Mollicone, J.-P., Battista, F., Gualtieri, P., Casciola, C.: Energy fluxes in turbulent separated flows. J. Phys.: Conf. Ser. (IOP Publishing) 759, 012003 (2016)Google Scholar
- 9.Fischer, P., Lottes, J.W., Kerkemeier, S.G.: Nek5000 - open source spectral element CFD solver. Argonne National Laboratory, Mathematics and Computer Science Division, Argonne, IL (2008). http://nek5000.mcs.anl.gov