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Laminar Flow, Reynold number

Posted Jun 29, 2021, 7:52 a.m. EDT Computational Fluid Dynamics (CFD) 1 Reply

A. Munazza
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How to fix Reynold number in laminar flow? I have consider a rectangular geometry having a circular ostacle inside. I want to set Renold number as 100, 500, 1000 . Please help me if possible. Many thanks in advance.

1 Reply Last Post Jun 29, 2021, 10:49 a.m. EDT
Advitya Patyal
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Posted: 3 years ago Jun 29, 2021, 10:49 a.m. EDT

Hi. The Reynolds number is controlled by the different quantities defining it, specifically the length scale (like the size of the circular obstacle, not always), density, viscosity and velocity. If you wanted to increase the reynold's number, one way would be to increase your velocity by the same amount. So, if using a value of 1 m/s for the incoming velocity gives you a Re=10, increasing the velocity to 10 m/s would give you Re=100. You can also do the same thing by increasing your obstacle size. But, in most cases the geometry is fixed and the inflow velocity is the simplest knob.

Hi. The Reynolds number is controlled by the different quantities defining it, specifically the length scale (like the size of the circular obstacle, not always), density, viscosity and velocity. If you wanted to increase the reynold's number, one way would be to increase your velocity by the same amount. So, if using a value of 1 m/s for the incoming velocity gives you a Re=10, increasing the velocity to 10 m/s would give you Re=100. You can also do the same thing by increasing your obstacle size. But, in most cases the geometry is fixed and the inflow velocity is the simplest knob.

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