how to calculate reynolds number

farshads83 · June 27, 2019, 10:22

how can i calculate reynolds number in cube with three holes?
do i need hydrolic diameter for reynolds number? if yes, are holes taking account for calculating?
for expmple a cube with 300*300mm and three holes with 2mm radiuos how can i calculate?

flotus1 · June 28, 2019, 10:16

Based on your description, your flow has at least 2 representative length scales: the cube length 300mm and the hole diameter 4mm. Both length scales are valid for calculating a Reynolds number.
So the question should probably be: what do you need a Reynolds number for?
It is just a number, writing either one on a piece of paper does not change your simulation result

June 27, 2019, 10:22	how to calculate reynolds number	#1
farshads83 New Member far Join Date: Jun 2019 Posts: 8 Rep Power: 7	how can i calculate reynolds number in cube with three holes? do i need hydrolic diameter for reynolds number? if yes, are holes taking account for calculating? for expmple a cube with 300*300mm and three holes with 2mm radiuos how can i calculate?

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June 28, 2019, 10:16		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	Based on your description, your flow has at least 2 representative length scales: the cube length 300mm and the hole diameter 4mm. Both length scales are valid for calculating a Reynolds number. So the question should probably be: what do you need a Reynolds number for? It is just a number, writing either one on a piece of paper does not change your simulation result