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High Y plus wall values despite sizing, inflation and refinement |
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July 23, 2012, 12:48
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High Y plus wall values despite sizing, inflation and refinement
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#1 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14  |
i am getting high wall y plus values despite sizing, inflation and refinement. i am gtg value in exp of 5 or 4 desired values are for SA model. help required.
regards |
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July 23, 2012, 14:50
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#2 |
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Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
Could you rephrase the question? I didn't get it.
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July 23, 2012, 14:53
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elaboration of the query
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#3 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14 |
sir i am interested to model flow around an aircraft at mach 0.8. i am using SA model and facing problem of high y plus value they are in range of 3 exp 5. i have refined my mesh and changed settings for my inflation layers. however yet the values are not coming down. need guidance on this issue.
regards |
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July 24, 2012, 03:07
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#4 |
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Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27 |
What's the thickness of the first cell at the wing? What's the size of the aircraft?
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July 24, 2012, 03:19
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#5 |
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Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
Did I get you correctly? Althoug you change the thickness of the first cell, the Yplus values do not change?
I can't recall such a bug in Fluent. |
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July 24, 2012, 06:27
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calrifications
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#6 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14 |
the size of aircraft is around 18 m long and the thickness of first layer is 1 exp -7. still the Y plus is very high. may be i am doing some things wrong. the mesh quality as per skewness and orthogonal quality is good.
regards |
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July 24, 2012, 06:30
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#7 |
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Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27 |
So your first layer thickness is 100nm? Did your solution converge? What's the largest residual?
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July 30, 2012, 15:09
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Convergence values
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#8 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14 |
sir the convergence values are 1 exp -3. i have also used mesh adaptation but no avail. i seek guidance on this regard.
thanx |
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July 31, 2012, 15:20
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#9 | |
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Senior Member
Join Date: Mar 2011
Location: Germany
Posts: 552
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Quote:
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July 31, 2012, 15:44
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RE: CFD seeker sir
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#10 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14 |
sir mesh is scaled in the same units. i have tried both hexa and tetra meshes to get desired values but no avail.
regards |
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August 1, 2012, 04:06
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#11 |
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Senior Member
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20 |
could you please share your geometry and mesh file with me along with flow and boundary conditions if its not confidential, I will try on it and will let you know.... are you making your mesh in ICEM or Gambit or anyother software?
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August 1, 2012, 04:47
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geometry sharing
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#12 |
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Member
nauman hashmi
Join Date: Jun 2012
Posts: 54
Rep Power: 14 |
sure sir if i may have ur email address. my email is naumaneshanhashmi@gmail.com if you can send me a blank email, i will send you the requisite files.
regards |
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August 1, 2012, 11:54
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#13 | |
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Senior Member
Join Date: Mar 2011
Location: Germany
Posts: 552
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Quote:
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August 1, 2012, 16:14
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#14 |
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Senior Member
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20 |
kindly mail me the parasolid or acis(sat) version of your geometry as I use ICEM for meshing. Thanks
Regards |
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