Technical Paper
On Blockage Effects in Wind Tunnels – A CFD Study
2001-03-05
2001-01-0705
Validation studies often contains uncertainties due to boundary condition differences between computational fluid dynamics, CFD-, and experimental fluid dynamics, EFD-, in the setup for the cases involved. The present study is in two parts where the first part is a 2D parametric study of two geometrical parameters and their variation with blockage. The parameters were radius in the transition region from the windscreen to the roof and the angle of attack for the windscreen. A mesh blending technology has been used where an interpolation between two meshes is conducted on a vertices level for the creation of a mix between the two grids. Many CFD simulations have been done of which some are presented. The windscreen angle was more sensitive to blockage in the sense that trends in drag from two configurations may be erroneously predicted if large blockage is encountered.