How to selecting the turbulence specification method

Khai123 · April 22, 2022, 08:09

Hello, how to choose the turbulence specification method

- my project specification
- Sudden contraction 90*
- 5/5 m/s inlet
- Turbulence flow
- 2D geometry

In boundary condition, for inlet part

How to choose turbulence specification method

LuckyTran · April 22, 2022, 09:50

It's just a matter of which parameters you actually know and find most convenient. At the end of the day, what actually gets specified is the values of your transport variables: k and epsilon, k and omega, and so on. If you want to learn how to do it the correct way, then choose k and epsilon (or omega, or whatever) and input these values directly. When you go and try to estimate k and epsilon, you'll find that you more-often-than-not use turbulence intensity and some type of length scale because these are more universal parameters that you can translate between different geometries very easily whereas k and epsilon are scale specific.

April 22, 2022, 08:09	How to selecting the turbulence specification method	#1
Khai123 New Member Khairul Join Date: Apr 2022 Location: Malaysia Posts: 7 Rep Power: 4	Hello, how to choose the turbulence specification method - my project specification - Sudden contraction 90* - 5/5 m/s inlet - Turbulence flow - 2D geometry In boundary condition, for inlet part How to choose turbulence specification method

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April 22, 2022, 09:50		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,746 Rep Power: 66	It's just a matter of which parameters you actually know and find most convenient. At the end of the day, what actually gets specified is the values of your transport variables: k and epsilon, k and omega, and so on. If you want to learn how to do it the correct way, then choose k and epsilon (or omega, or whatever) and input these values directly. When you go and try to estimate k and epsilon, you'll find that you more-often-than-not use turbulence intensity and some type of length scale because these are more universal parameters that you can translate between different geometries very easily whereas k and epsilon are scale specific.