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.