# calculating actual momentum thickness(theta) & Reynolds number based on it(Re_theta)

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September 21, 2020, 07:41
calculating actual momentum thickness(theta) & Reynolds number based on it(Re_theta)
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Jalal
Join Date: Sep 2020
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Hi everyone!

I need to calculate momentum thickness (theta) and Reynolds number based on it (Re_theta) for a turbulent flow over a flat plate to capture the turbulent boundary layer.

How to find the stream-wise location for a given Re_theta??
I do it as shown in attachment 1.

After getting the required location, how do we calculate the actual momentum thickness?
I do it as shown in attachment 2.

Am I doing it right?

Problem details:
LES of turbulent flow over a Flat plate
Flow is parallel to the plate
Re (based on length of the plate) = 1 million
Ma=0.3

Domain:
shown in attachment named domain. The plate starts at x=0
Flow is in positive x direction.

If further details are needed, please do tell me...

Cheers!!
Attached Images
 1.jpg (53.7 KB, 40 views) 2.jpg (55.2 KB, 32 views) domain.png (27.0 KB, 23 views) cells.png (84.2 KB, 20 views)