modeling flow around aerodynamic profile with using immersed solid

yutangg · June 8, 2013, 14:36

Hi everyone!
I try to modeling flow around aerodynamic profile with using immersed solid.
I did simulates with change:
- Momentum Sources (global) ( 7 to 50)
- Boundary Distance (0.7 to 3 mm for my mesh 0.5 mm )
and still nothing, the results (flow field and lift, drag force) are wrong.

How use immersed solid to aerodynamic simulation?

hmasenger · June 9, 2013, 04:38

it is really important to have inflated meshes near wall boundaries.did you use this type of mesh ?

yutangg · June 10, 2013, 16:38

thank you for your answer
yes, i tried out several types of nets but still i can't observe good the boundary layer

ghorrocks · June 10, 2013, 21:49

What Re and/or Ma number is the flow? What y+ are you using?

yutangg · June 11, 2013, 14:17

it's a laminar flow 800 Re and y+ < 2

ghorrocks · June 11, 2013, 21:54

y+ has no meaning for laminar flows.

If this is a laminar model then you might be able to get this to work with immersed solids. It is likely to be quite grid sensitive - have you done a mesh sensitivity check?

June 8, 2013, 14:36	modeling flow around aerodynamic profile with using immersed solid	#1
yutangg New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	Hi everyone! I try to modeling flow around aerodynamic profile with using immersed solid. I did simulates with change: - Momentum Sources (global) ( 7 to 50) - Boundary Distance (0.7 to 3 mm for my mesh 0.5 mm ) and still nothing, the results (flow field and lift, drag force) are wrong. How use immersed solid to aerodynamic simulation? Last edited by yutangg; June 8, 2013 at 18:11.

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June 9, 2013, 04:38		#2
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	it is really important to have inflated meshes near wall boundaries.did you use this type of mesh ?

June 10, 2013, 16:38		#3
yutangg New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	thank you for your answer yes, i tried out several types of nets but still i can't observe good the boundary layer

June 10, 2013, 21:49		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	What Re and/or Ma number is the flow? What y+ are you using?

June 11, 2013, 14:17		#5
yutangg New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	it's a laminar flow 800 Re and y+ < 2

June 11, 2013, 21:54		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	y+ has no meaning for laminar flows. If this is a laminar model then you might be able to get this to work with immersed solids. It is likely to be quite grid sensitive - have you done a mesh sensitivity check?