3D centrifugal pump y+ ?

spk · February 17, 2010, 13:06

Hi guys,

I try to mesh a 3D centrifugal pump! Using spalart-allmaras model y+ has to be 1 or greater than 30. I made a boundary layer near the blades fine in order to achieve the y+ = 1. Because of the huge number of cells i cant do the same for the other walls of the pump. That will affect the solution? Is there anything else that i have to care for using this model?

Thanks

Jade M · April 30, 2010, 14:23

The only way to know if the solution is affected is to demonstrate grid independence.

Ahmed Saeed Mansour · July 13, 2016, 14:14

Is there a formula that is used to calculate the y+ for the pump simulations?

February 17, 2010, 13:06	3D centrifugal pump y+ ?	#1
spk Member Join Date: Aug 2009 Posts: 67 Rep Power: 16	Hi guys, I try to mesh a 3D centrifugal pump! Using spalart-allmaras model y+ has to be 1 or greater than 30. I made a boundary layer near the blades fine in order to achieve the y+ = 1. Because of the huge number of cells i cant do the same for the other walls of the pump. That will affect the solution? Is there anything else that i have to care for using this model? Thanks

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April 30, 2010, 14:23		#2
Jade M Senior Member Join Date: Feb 2010 Posts: 148 Rep Power: 17	The only way to know if the solution is affected is to demonstrate grid independence.

July 13, 2016, 14:14		#3
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Is there a formula that is used to calculate the y+ for the pump simulations?