Equivalent sand grain roughness alternatives

arun1994 · May 8, 2018, 10:51

Hello !

Are there approaches to model the roughness effects in the RANS equations for wall corrections other than the usual equivalent sand grain roughness ?

I understand it is the most used approach , but i would like to explore others in RANS LES or DNS ( In DNS how the meshing is done ,instead of wall corrections) . Will be thankful if I can atleast get some papers or links to look at

Cheers,
Arun

FMDenaro · May 8, 2018, 12:27

Quote:

Originally Posted by arun1994

Hello !

Are there approaches to model the roughness effects in the RANS equations for wall corrections other than the usual equivalent sand grain roughness ?

I understand it is the most used approach , but i would like to explore others in RANS LES or DNS ( In DNS how the meshing is done ,instead of wall corrections) . Will be thankful if I can atleast get some papers or links to look at

Cheers,
Arun

There are interesting papers exploring DNS in some ways:

https://www.researchgate.net/profile...-sandpaper.pdf

https://www.cambridge.org/core/journ...A1D2E28F204A6C

https://ntrs.nasa.gov/archive/nasa/c...0170000677.pdf

arun1994 · May 8, 2018, 12:32

Thank you very much , I will look into them. Do you have any papers that account roughness without using equivalent sand grain roughness please?

FMDenaro · May 8, 2018, 12:33

Quote:

Originally Posted by arun1994

Thank you very much , I will look into them. Do you have any papers that account roughness without using equivalent sand grain roughness please?

No I never used such model but I suggest to have a look into journals like PoF and JFM.

arun1994 · May 8, 2018, 12:34

Grazieeee!

FMDenaro · May 9, 2018, 12:38

An example of LES application
https://www.researchgate.net/publica...cular_cylinder

May 8, 2018, 10:51	Equivalent sand grain roughness alternatives	#1
arun1994 Member Arun subramanian Join Date: Jun 2016 Location: Florence,Italy Posts: 48 Rep Power: 10	Hello ! Are there approaches to model the roughness effects in the RANS equations for wall corrections other than the usual equivalent sand grain roughness ? I understand it is the most used approach , but i would like to explore others in RANS LES or DNS ( In DNS how the meshing is done ,instead of wall corrections) . Will be thankful if I can atleast get some papers or links to look at Cheers, Arun

May 8, 2018, 12:34		#5
arun1994 Member Arun subramanian Join Date: Jun 2016 Location: Florence,Italy Posts: 48 Rep Power: 10	Grazieeee! FMDenaro likes this.

May 9, 2018, 12:38		#6
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,896 Rep Power: 73	An example of LES application https://www.researchgate.net/publica...cular_cylinder arun1994 likes this.

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May 8, 2018, 12:32		#3
arun1994 Member Arun subramanian Join Date: Jun 2016 Location: Florence,Italy Posts: 48 Rep Power: 10	Thank you very much , I will look into them. Do you have any papers that account roughness without using equivalent sand grain roughness please?