Why the authors of this article has meantioned the reynolds number?

Roh · April 11, 2019, 08:41

Guys,
In this article the authors has meantioned the reynolds number of chord. Why?

https://arc.aiaa.org/doi/10.2514/3.50501

How can we use it? I don't get why they've meantioned it.

LuckyTran · April 11, 2019, 12:54

Reynolds number is a very important non-dimensional number, it's a similarity variable. You will see it mentioned very very very frequently in fluid mechanics. It let's you maintain dynamic similitude across different velocity scales and length scales.

Imagine you want to study flow over a very big airfoil that has a chord of 1 km or a super small airfoil with a chord of 1mm. How do you maintain the comparison of flow speeds with these different length scales? Reynolds number lets you do that.

April 11, 2019, 08:41	Why the authors of this article has meantioned the reynolds number?	#1
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 8	Guys, In this article the authors has meantioned the reynolds number of chord. Why? https://arc.aiaa.org/doi/10.2514/3.50501 How can we use it? I don't get why they've meantioned it.

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April 11, 2019, 12:54		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	Reynolds number is a very important non-dimensional number, it's a similarity variable. You will see it mentioned very very very frequently in fluid mechanics. It let's you maintain dynamic similitude across different velocity scales and length scales. Imagine you want to study flow over a very big airfoil that has a chord of 1 km or a super small airfoil with a chord of 1mm. How do you maintain the comparison of flow speeds with these different length scales? Reynolds number lets you do that.