[sandy_1982]

hi friends ,

i am simulating flow which takes place over a duct that is protruding out of a wall .
Pl find attached the picture of the flow domain and also the dimensions in 'mm' as indicated there.

here are the BCs i have used :
‘Inlet’: u = 0,
v = 50.83m/s,
w = 200.91m/s ( as the flow is in the YZ plane at an angle of attack)
‘Outlet’ = 0 psi
Top face = ‘No-slip wall’
Face 1 = ‘Opening’ at 0 psi
Face 2 = ‘Opening’ at 0 psi
Shaded face = ‘Symmetry’

the problem i face is that pressure which i am monitoring just upstream of the duct , where the flow hits is, comes equal to 15 psi (gauge)where as it should be around 3- 3.5 psi (g) as per calculation ?

suspecting something wrong with the BCs on the Faces 1 and 2 , i have used 'opening with entrainment' , ' opening with cartesian vel. components' and also 'free slip wall' but each time the pressure has been on the higher side

could you please guide me as to where i am going wrong in the AoA case , which i have tried to illustrate in the attached figure.

[ for 0 deg AoA, i get good match with the analytical value.]

thanks

Sandeep