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The paper presents the numerical results obtained with the use of the ANSYS FLUENT commercial code for analysing the ow structure around a two rectangular inline surface-mounted blu bodies immersed in a boundary layer. The calculation of a conguration with a ow around objects has been performed using both the steady and unsteady approaches (RANS, uRANS). Eects of the inow boundary layer thickness on the velocity and pressure field, wall shear stress and the grid resolution accuracy in predicting periodic vortex shedding from two bodies in a tandem arrangement was examined. It has been observed that the separation length is considerably reduced with an increase in the δ/H parameter. This research was supported in part by PL-Grid Infrastructure.

The role of inflow boundary layer thickness for numerical modelling of flow around bluff bodies of built-up areas