Y+ for rough surface

Rana abdo · November 30, 2023, 19:33

I have a several rough surface geometries how can i adjust y+ for each roughness case
(For each roughness case i have the roughness parameters)
I Know that i have to adjust y+ between 30 to 300 for roughness but which value when i use 30 or 50 or higher i get different results. So which y+ is optimum and i am using the k w sst model ?

CFDfan · November 30, 2023, 22:55

Quote:

Originally Posted by Rana abdo

I have a several rough surface geometries how can i adjust y+ for each roughness case
(For each roughness case i have the roughness parameters)
I Know that i have to adjust y+ between 30 to 300 for roughness but which value when i use 30 or 50 or higher i get different results. So which y+ is optimum and i am using the k w sst model ?

I might be wrong but as far as I recall the K-Omega SST requires the Y+ <1, so please verify that

Rana abdo · December 1, 2023, 01:52

Even if i use k e model with standard wall function wich y+ value in a range of 30 to 300 should i use for each roughness case on what bases do i choose the y+ value ?

November 30, 2023, 19:33	Y+ for rough surface	#1
Rana abdo New Member Rana abdo Join Date: Apr 2023 Posts: 9 Rep Power: 3	I have a several rough surface geometries how can i adjust y+ for each roughness case (For each roughness case i have the roughness parameters) I Know that i have to adjust y+ between 30 to 300 for roughness but which value when i use 30 or 50 or higher i get different results. So which y+ is optimum and i am using the k w sst model ?

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December 1, 2023, 01:52		#3
Rana abdo New Member Rana abdo Join Date: Apr 2023 Posts: 9 Rep Power: 3	Even if i use k e model with standard wall function wich y+ value in a range of 30 to 300 should i use for each roughness case on what bases do i choose the y+ value ?