How to design an Open Scale Model Wind Tunnel

I finish it.
Wind tunnel
I hope is wath you are looking for.

I am also doing a simulation in SoliWorks and the experimental data are taken from a wind tunnel with contraction ratio 7.5:1. What contraction actually means ?

Thank you. Now I understand it. I tried to make some small modifications on the wind tunnel model you have posted earlier on but I get some difficulties. Is there any way to change the ratio value and put plexiglass around the test section area ? Basically I tried to modified it to become like the UUC low turbulence subsonic wind tunnel, if you can take a quick look.

You can change the material of the test section area by applying the material on each face of the testing area. I will try to change the ratio value by addind another plane for the loft command.

I hope you can find the answer to your question on this site.
http://navier.stanford.edu/bradshaw/tunnel/contraction.html

Answered with a tutorial: https://grabcad.com/tutorials/how-to-design-an-open-scale-model-wind-tunnel

I modified the wind tunnel but I don't know how exactily to make the ratio 7.5:1.
Wind tunnel 2

Great model. Thanks i will try to find out a way. Furthermore I have some questions about the Flow Simulation of SolidWorks. I am trying to achieve a Cd for an SD2030 airfoil but I am achieving a lower value. Despite the finer mesh I tried and the boundary conditions I have put still from the target value of 0.8 I am getting 0.6. Is there any parameter that I can later to get closer to the target value ?

Sorry its for Cl not Cd.

You can use this site to document.
http://www.slideshare.net/krrbanirudh/wind-tunnel-design
I will try to make a 3D model of a wind tunnel after the images from the site but I don't know if is going to be exactly what you are looking for.
The test section area isn't 150x150x300 mm? 15x150x300mm seems to be too narrow.

I finished to make some modifications to the wind tunnel, but I don't know exactly how to make the ratio 7.5:1.
Wind tunnel 2