CFL3D and FUN3D Analysis of HiLiftPW-1 Workshop Cases · HiLiftPW-1 Workshop Cases Elizabeth M....
Transcript of CFL3D and FUN3D Analysis of HiLiftPW-1 Workshop Cases · HiLiftPW-1 Workshop Cases Elizabeth M....
1http://fun3d.larc.nasa.govHiLiftPW-1 June 26-27, 2010
CFL3D and FUN3D Analysis of
HiLiftPW-1 Workshop Cases
Elizabeth M. Lee-Rausch & Christopher L. Rumsey
NASA Langley Research Center
1st AIAA CFD High Lift Prediction Workshop (HiLiftPW-1)
Sponsored by the Applied Aerodynamics TC
Chicago, IL
June 27-27, 2010
2http://fun3d.larc.nasa.govHiLiftPW-1 June 26-27, 2010
CFD Code Descriptions
• CFL3D Structured-Grid Code
– Parallel 3D compressible cell-centered finite-volume RANS
– Thin-layer Navier-Stokes equations in all coordinate directions
– Implicit local time-stepping using AF relaxation for linear system
– Upwind Roe flux-difference splitting for inviscid fluxes
– Spalart-Allmaras and SST turbulence models, fully-turbulent
• FUN3D Unstructured-Grid Code
– Parallel 3D compressible finite-volume RANS for mixed-element meshes
– Full Navier-Stokes equations-node centered
– Implicit local time-stepping using multi-color point Gauss-Seidel relaxation for
linear system
– UMUSCL 0.5 scheme (Averaging + Upwind) for inviscid fluxes with
Venkatakrishnan limiter
– Combined Green-Gauss and edge-based gradients for viscous fluxes
– Spalart-Allmaras turbulence model, fully-turbulent
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Cases and Grids
HiLiftPW-1 June 26-27, 2010
Struct.
1 to 1 – A
(Boeing)
Strut.
1 to 1 – B
(Pointwise)
Unst. Tet
NC - A
(UWYO)
Unst. Mixed
NC - B
(DLR-Solar)
FUN3DSA
(Mixed)
SA
(not finished)
CFL3DSA
SSTSST
• Required Case 1 and Case 2
• Optional Case 3 not done
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Extra-
Coarse
Coarse Medium Fine Extra-
Fine
Struct.
1-to-1 A
Boeing
7.1M 22.6M 52.1M 171M
Stuct.
1-to-1 B
Pointwise
3.8M 11.2M 28.7M 85.5M
Mixed ver.
Unst.
Tet. NC A
VGRID
3.7M 11.0M 32.4M
Mixed
NC B
Solar
12.3M 37.0M 111M
Comparison of Grid Sizes
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Configuration 1 – Lift Polar
HiLiftPW-1 June 26-27, 2010
ALPHA
CL
0 5 10 15 20 25 30 35 401
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
earlierstall onOnetoOneB
lower lift forSSTcomparedtoSA
ALPHA
CL
0 5 10 15 20 25 30 35 401
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
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Configuration 1 – Drag Polar
HiLiftPW-1 June 26-27, 2010
CD
CL
0 0.2 0.4 0.6 0.8 11
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
CD
CL
0 0.2 0.4 0.6 0.8 11
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
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Config. 1 – Pitching Moment Polar
HiLiftPW-1 June 26-27, 2010
CM
CL
-0.5 -0.4 -0.3 -0.2 -0.11
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
CM
CL
-0.5 -0.4 -0.3 -0.2 -0.11
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
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Configuration 8 – Lift Polar
HiLiftPW-1 June 26-27, 2010
ALPHA
CL
0 5 10 15 20 25 30 35 401
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
ALPHA
CL
0 5 10 15 20 25 30 35 401
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
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Configuration 8 – Drag Polar
HiLiftPW-1 June 26-27, 2010
CD
CL
0 0.2 0.4 0.6 0.8 11
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
CD
CL
0 0.2 0.4 0.6 0.8 11
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
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Config. 8 – Pitching Moment Polar
HiLiftPW-1 June 26-27, 2010
CM
CL
-0.5 -0.4 -0.3 -0.2 -0.11
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneAexperiment
CM
CL
-0.5 -0.4 -0.3 -0.2 -0.11
1.5
2
2.5
3
3.5
CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneACFL3D, SST, OnetoOneBexperiment
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Configuration 1 – SOLAR Grids
HiLiftPW-1 June 26-27, 2010
ALPHA
CL
0 5 10 15 20 25 30 35 401
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)FUN3D, SA, MixNCBexperiment
CD
CL
0 0.2 0.4 0.6 0.8 11
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)FUN3D, SA, MixNCBexperiment
CM
CL
-0.55 -0.5 -0.45 -0.4 -0.35 -0.3 -0.25 -0.2 -0.151
1.5
2
2.5
3
3.5
FUN3D, SA, Mix(NCTetA)FUN3D, SA, MixNCBexperiment
Lift Drag Pitching Moment
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Grid Convergence – Config. 1
HiLiftPW-1 June 26-27, 2010
N (̂-2/3)
CD
0 1E-05 2E-05 3E-05 4E-05 5E-050.3
0.305
0.31
0.315
0.32
0.325
0.33
0.335
0.34
0.345
0.35
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 13 deg
N (̂-2/3)
CL
0 1E-05 2E-05 3E-05 4E-05 5E-051.92
1.94
1.96
1.98
2
2.02
2.04
2.06
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 13 deg
N (̂-2/3)
CM
0 1E-05 2E-05 3E-05 4E-05 5E-05-0.52
-0.5
-0.48
-0.46
-0.44
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 13 deg
Angle of Attack 13 deg
Lift Drag Pitching Moment
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Grid Convergence – Config. 1
HiLiftPW-1 June 26-27, 2010
Angle of Attack 28 deg
Lift Drag Pitching Moment
N (̂-2/3)
CM
0 1E-05 2E-05 3E-05 4E-05 5E-05-0.48
-0.46
-0.44
-0.42
-0.4
-0.38
-0.36
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 28 deg
N (̂-2/3)
CD
0 1E-05 2E-05 3E-05 4E-05 5E-050.63
0.64
0.65
0.66
0.67
0.68
0.69
0.7
FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 28 deg
N (̂-2/3)
CL
0 1E-05 2E-05 3E-05 4E-05 5E-052.65
2.7
2.75
2.8
2.85
2.9
2.95FUN3D, SA, Mix(NCTetA)CFL3D, SA, OnetoOneACFL3D, SST, OnetoOneAexperiment
Alpha = 28 deg
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
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FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
20http://fun3d.larc.nasa.govHiLiftPW-1 June 26-27, 2010
FUN3D Surface Restricted Streamlines
Medium Grid
Config. 1 Config. 8
21http://fun3d.larc.nasa.govHiLiftPW-1 June 26-27, 2010
FUN3D vs CFL3D Surface Flows –Config. 1
Medium Grid
FUN3D SA CFL3D SA CFL3D SST
AOA 13 deg
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FUN3D vs CFL3D Surface Flows –Config. 1
Medium Grid
FUN3D SA CFL3D SA CFL3D SST
AOA 28 deg
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FUN3D Config. 1
Medium Grid
Tet NC A
(Mixed) Mixed NC B
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Summary
• Grid convergence study¯ SST lower lift than SA (likely flap separation)
¯ Struct. Grid and unst. Grid results with same turbulence model compare well
¯ At higher alpha more difference between codes and more variation with grid refinement
• Flap study(medium grid)¯ Grid density/topology matters at highest AOA
One-to-one structured grid B seems to predict early stall
SOLAR grid results improved correlation at high AOA
¯ Config. 1 has more flap separation than Config. 8
¯ SST predicts more flap separation than SA
¯ FUN3D predicts wing separation at highest AOA for Config. 8 (not seen in CFL3D solutions)
HiLiftPW-1 June 26-27, 2010
25http://fun3d.larc.nasa.govHiLiftPW-1 June 26-27, 2010
Acknowledgements
• Dr. Eric Nielsen, NASA LaRC
• Dana Hammond, NASA LaRC