STREAM-FUNCTION BASED MULTIPLE BLUFF-BODIES 2D FLOW-ANALYSIS

The structure of 2D solenoidal or non solenoidal incompressible viscou s channel flows in presence of obstacles was numerically investigated with special reference to laminar and transition conditions. The resul ts obtained with a psi,zeta model and a Control Volume approach depend upon the supposed inflow-outflow boundary conditions. The numerical s olution of the flow around multiple Bluff Bodies require also the dete rmination of the B.C.s for the Stream Function on the obstacles. Moreo ver, for models of incompressible flows, where also source like obstac les are considered, the flow may result to be non solenoidal; in these cases multivalued Stream Functions were successfully employed. A new, highly accurate, vector upwinded scheme, recently introduced by the a uthors, is used for the treatment of convective terms at high Cell Rey nolds numbers. Meaningful results were obtained without the need of sp ecial grids, or of spectral methods.