Y plus values

osamaghani · June 12, 2012, 03:24

I am modelling 2d flow over a bluff body..
Domain consists of Inlet, outlet, geometry(bluff body;wall), ground(wall) and far0field(wall)

1. I am using standard wall treatment and so the range of Y+ values should be in the range of 30 to 300..My question is should this condition be met on all the walls (ground...far-field..) of the domain or just the geometry(the bluff body) of interest... ?

2. To what extent can the Y+ lie out side this range..? I think its not very easy to get all the Y+ values in this range...

for example for 1 simulation Y+ values on bluff bogy are in the range of 4.5 - 600 and the average is 100....do I need to redo the grid?

I would really appreciate of you could also provide some reference

Far · June 12, 2012, 05:47

use scalable wall function instead of standard wall function.

osamaghani · June 12, 2012, 05:53

can you please elaborate....does fluent have that?...btw do these values seem good to you or??

June 12, 2012, 03:24	Y plus values	#1
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	I am modelling 2d flow over a bluff body.. Domain consists of Inlet, outlet, geometry(bluff body;wall), ground(wall) and far0field(wall) 1. I am using standard wall treatment and so the range of Y+ values should be in the range of 30 to 300..My question is should this condition be met on all the walls (ground...far-field..) of the domain or just the geometry(the bluff body) of interest... ? 2. To what extent can the Y+ lie out side this range..? I think its not very easy to get all the Y+ values in this range... for example for 1 simulation Y+ values on bluff bogy are in the range of 4.5 - 600 and the average is 100....do I need to redo the grid? I would really appreciate of you could also provide some reference

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June 12, 2012, 05:47		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	use scalable wall function instead of standard wall function.

June 12, 2012, 05:53		#3
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	can you please elaborate....does fluent have that?...btw do these values seem good to you or??