Mesh quality and wall function in FLUENT - k-omega model

newcomer · February 21, 2011, 21:22

Hi,

I am modeling the flow inside a flume of dimension 0.3 m wide x 10 m length. I used k-omega model in FLUENT but the results look inaccurate. I am checking my mesh again and found the wall y plus ranged from 0.1 to 0.9. I noted that the recommended values are from 30-300, but I have no idea about what modification is needed for the mesh - finer or coarser, etc. Can anyone advise how I could modify the mesh to adjust the wall y plus to such value ?

Many thanks!

cfd seeker · May 19, 2011, 03:00

k-w model is valid through out the boundary layer and hence it uses Near Wall Modelling approach.For Near Wall Modelling approach wall y+ has to b/w 1-5, which isnt in your mesh. So coursen your mesh a bit so that wall y+ came in b/w 1-5 and then find the results. Hope it works

February 21, 2011, 21:22	Mesh quality and wall function in FLUENT - k-omega model	#1
newcomer New Member Gillian Join Date: Sep 2010 Posts: 15 Rep Power: 15	Hi, I am modeling the flow inside a flume of dimension 0.3 m wide x 10 m length. I used k-omega model in FLUENT but the results look inaccurate. I am checking my mesh again and found the wall y plus ranged from 0.1 to 0.9. I noted that the recommended values are from 30-300, but I have no idea about what modification is needed for the mesh - finer or coarser, etc. Can anyone advise how I could modify the mesh to adjust the wall y plus to such value ? Many thanks!

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May 19, 2011, 03:00		#2
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	k-w model is valid through out the boundary layer and hence it uses Near Wall Modelling approach.For Near Wall Modelling approach wall y+ has to b/w 1-5, which isnt in your mesh. So coursen your mesh a bit so that wall y+ came in b/w 1-5 and then find the results. Hope it works