YPlus Value

ENGRTAHIR · October 23, 2014, 13:21

I am working on external flow of finned projectile in subsonic range, and use SST model for turbulence. I used Y+ value of 64 and also of 1.5 with hybrid mesh but my results are not compared with experimental. I use reference pressure 1atm and mach number is 0.5.
My inlet intensity is medium
Can anybody help me why its happening

Mason liu · October 24, 2014, 05:08

I'm not familiar with your case, but you may can try large region of Yplus(i.e. from 0.01-5, name it, 0.01/0.03/0.06/0.09/0.15/0.3/0.6/0.9,,,, or just typical value of those), just for sensitivity analysis, may find a good region of it.
Just try some small Yplus value, see if have significant influence on interested variable.

ENGRTAHIR · October 24, 2014, 10:52

Thanks for quick reply.
I worked on guided 155 finned projectile.
the servo fin and motor fin are both opened, and i used hybrid mesh for creating grid in ICEM CFD.
Will the hybrid mesh effect CP value. when my Wall Y+ is less than 100 then my results match but when Y+ is 1 then it deviate.
What i do?
also can you help me in mesh making

October 23, 2014, 13:21	YPlus Value	#1
ENGRTAHIR Member tahir Join Date: May 2010 Posts: 35 Rep Power: 15	I am working on external flow of finned projectile in subsonic range, and use SST model for turbulence. I used Y+ value of 64 and also of 1.5 with hybrid mesh but my results are not compared with experimental. I use reference pressure 1atm and mach number is 0.5. My inlet intensity is medium Can anybody help me why its happening

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October 24, 2014, 05:08		#2
Mason liu New Member Mason Join Date: Sep 2014 Posts: 22 Rep Power: 11	I'm not familiar with your case, but you may can try large region of Yplus(i.e. from 0.01-5, name it, 0.01/0.03/0.06/0.09/0.15/0.3/0.6/0.9,,,, or just typical value of those), just for sensitivity analysis, may find a good region of it. Just try some small Yplus value, see if have significant influence on interested variable.

October 24, 2014, 10:52		#3
ENGRTAHIR Member tahir Join Date: May 2010 Posts: 35 Rep Power: 15	Thanks for quick reply. I worked on guided 155 finned projectile. the servo fin and motor fin are both opened, and i used hybrid mesh for creating grid in ICEM CFD. Will the hybrid mesh effect CP value. when my Wall Y+ is less than 100 then my results match but when Y+ is 1 then it deviate. What i do? also can you help me in mesh making