Turbulent Flow Past Two-Body Configurations

Flows Around Bodies

Underlying Flow Regime 2-12

Abstract

Interaction of inherently unsteady wakes created by bluff bodies with other bodies or elements of the same body is a complex phenomenon commonly encountered in many flows of technical interest, e.g., the oleo and hoses on a landing gear, high lift wing configurations, environmental flows, heat exchanger fins, chimney stacks, off-shore oil platforms, etc. The flow past a tandem cylinders (TC) is a prototype for many of such interaction problems and possesses some of their typical features (separation of turbulent boundary layer from the front cylinder and free shear layer roll-up, interaction of unsteady wake with the downstream cylinder, and unsteady massively separated flow in its wake), thus being a fairly general representative of the considered UFR. This motivated an experimental campaign of NASA Langley Research Center aimed at accumulating reliable benchmark data for the TC flow. These data have been used in the course of two subsequent international CFD campaigns (EU Project ATAAC and BANC-I Workshop) aimed at evaluating a capability of different turbulence modelling approaches and numerical methods to reproduce properly complex turbulent flows, in general, and the high Reynolds number TC flow, in particular. A purpose of this document is to summarise results of simulations of the TC flow carried out within the ATAAC project. Together with a similar analysis of the computational studies presented at the BANC-I Workshop, this gives a clear vision of both capabilities and restrictions of the current CFD methods and turbulence modelling strategies with regard to the considered UFR.