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September 17, 2023, 18:18 |
Turbulence Properties
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#1 |
New Member
Anas Ayman
Join Date: Jul 2023
Posts: 1
Rep Power: 0 |
I am simulating a turbulent flow around an airfoil at Re = 6e+6 and Ma = 0.7 and I chose the turbulence model to be kOmega
I have several questions about the pre-processing part 1. What is the difference between nu and nut? and What property is needed in "0" file? 2. How to let OpenFOAM understand the Re? (How to enter Re into OpenFOAM)? 3. How to calculate "Omega"? 4. How to calculate "k"? |
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September 18, 2023, 03:15 |
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#2 | |||
Senior Member
Join Date: Dec 2021
Posts: 231
Rep Power: 5 |
Hey
Quote:
nu is the kinematic viscosity that should be used in transportProperties (assuming you use simpleFoam for instance) and nut is the turbulent viscosity, which is used in the 0 folder. Quote:
OpenFoam does not need to understand the Re, your boudary conditions will dictate it (your inlet velocity, your airfoil etc). Quote:
If you look around in the OpenFoam doc and online, you will find formulas to calculate the initial values depending on your fluid and your conditions. There is this online calculator if you want to compare values: http://ichrome.com/blogs/archives/342 Good luck! And search the forum too, you will find better and more complete answers than mine |
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