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Solid works issue



I started using Flow Simulation SolidWorks, for getting the pressure from the wind on my curved roof.

I am confused if I am doing the job right.
First of all I do not know if I do have to create the "wind tunnel" or not?

Here is the example of project without the "wind tunnel":

And here is how I though "wind tunnel" should look like - simply by putting 4 solids around my roof (left, right, top, bottom solids):

But it seems that this "wind tunnel" I created is not contributing to anything. Take a look at the longitudinal cut through the Flow simulation project:

Do you see how the red, orange and yellow zones flow into the solid. Like it does not exist.

So do I need this 4 solids or not?

Thank you.