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August 8, 2013, 06:37 |
computing boundary layer thickness
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#1 |
Member
Liam
Join Date: Aug 2013
Posts: 40
Rep Power: 12 |
Hi people,
Anyone knows how can I compute boundary layer thickness for an arbitrary geometry? I have seen some theoretical formulas for flat plates, but I am not sure if there exists a formula for any kind of problem... Thank you so much |
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August 12, 2013, 06:29 |
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#2 |
New Member
Fateme Sh
Join Date: Jul 2013
Location: Tehran
Posts: 8
Rep Power: 12 |
first you need to find the first row height
regarding to your flow condition you can find your first row height with the help of yplus calculations in here: http://geolab.larc.nasa.gov/APPS/YPlus/ then i think 12 rows is enough (base on my experiments and studies) for the boundary layer mesh |
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August 12, 2013, 06:47 |
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#3 |
Member
Liam
Join Date: Aug 2013
Posts: 40
Rep Power: 12 |
Hi aeroAngel,
I am seeing that those calculations are for a flat plate. Are the values computed here valid for an arbitrary geometry? Thanks for your reply! |
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August 12, 2013, 07:24 |
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#4 |
New Member
Fateme Sh
Join Date: Jul 2013
Location: Tehran
Posts: 8
Rep Power: 12 |
the nasa calculator is based on yplus calculations which is for any wall-bounded flow,
I've used it in my calculations for any shape ,like other engineers that i know and I haven't seen something about not using it in my studies. I asked other engineers and they agreed |
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August 12, 2013, 09:22 |
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#5 |
Senior Member
James
Join Date: May 2013
Posts: 116
Rep Power: 12 |
Thank you so much! I will have to make several aproximations because freestream velocity is not given, I only know pressure values at inlet/outlet and I guess this info is not enough for the calculator...
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August 12, 2013, 09:32 |
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#6 | |
Member
Join Date: Jul 2013
Posts: 55
Rep Power: 12 |
Quote:
After solving your case with the mesh corresponding to your assumption, you could use the solution to improve your reference velocity, in order to adapt your mesh to the physics of your case. |
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