[usamaubk]

I am calculating drag and lift coefficients of an object placed in a wind tunnel numerically.
I am using 2 different WT geometries. one is much larger like other is smaller. In order to see the experimental blockage effect.

My question is: Does drag co-efficient depend upon the area of cross-section of the wind tunnel that I am using. Imagine placing an object once in a big box around it and other time in a small box.
WT-1: 350mm W x 350 mm H with the length of 1meter
WT-2: 2.2m W x2m H with the length of 1.6meter

Cd depends upon Drag force, dynamic pressure and the ref. area of the object placed. My BC's are constant velocity at the inlet and zero pressure outlet.
So, how does the Cd behave in this case as it is not depending on the area of WT am using? experimentally it increases in case of small WT area bcz of blockage ratio dues to walls etc. is it bound to happen numerically too. bcz in my case it not happening.

Also, my object is placed far away from the inlet. will it have some effect on it.