aepw-1 hirenasd test cases · ruag aviation, department aerodynamics operates two subsonic wind...
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AePW-1 HIRENASD test cases
A. Gehri and D.Steiling
RUAG Aviation
Who we are
RUAG Aviation, Department Aerodynamics
Operates two subsonic wind tunnels
Large Wind Tunnel Emmen (LWTE), 7x5m, aerospace (powered/unpowered),
full scale automotive rain testing
Automotive Wind Tunnel Emmen (AWTE), 2.45x1.55m, with road simulation
Manufactures wind tunnel balances for other wind tunnels
CFD in collaboration with CFS Engineering at the EPFL (Swiss Federal
Institute of Technology) in Lausanne
Alain Gehri
Experienced CFD engineer, within AePW responsible for meshing and
setup of calculations
Daniel Steiling
Aerodynamic engineer, within AePW responsible for coordination and
post-processing
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NSMB flow solver and settings
Multiblock Navier-Stokes solver, hence the name “NSMB”
Developed at the EPFL in Lausanne since 1991, together with other
universities and industrial partners
Settings used for the HIRENASD test cases:
Space discretization: 4th-order central scheme (Jameson)
Time integration: implicit LU-SGS scheme
Unsteady calculations: dual time stepping, w/ time correction procedure
Turbulence model: k-ω Menter Shear Stress (DES, RANS for static)
Particular version of NSMB had a bug in the ALE formulation
Dissipation for the turbulent equations was wrong, grid velocity not
included
Corrected now, and one case recalculated (not part of data submittal, but
shown in this presentation)
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Test case specific settings and
assumptions
Cases calculated
ct311-4, ETW 159: static steady (c/m/f) -> static aeroelastic (m) ->
dynamic (m), each with forced transition (12% U, 5%L)
ct311-5, ETW 271: static steady (c/m/f) -> static aeroelastic (m) ->
dynamic (m), each fully turbulent
Dynamic calculations with forced oscillation of the second bending
mode
Modal amplitude of 0.01 reference chord used (wing tip), translates to
an amplitude of 2.04mm at position of accelerometer 15
Six periods have been simulated, with the last two periods used to
determine the FRF, 64 time steps per period
𝐹𝑅𝐹 =𝑓𝑓𝑡 𝑒𝑥𝑖𝑡𝑎𝑡𝑖𝑜𝑛 ⋅𝑓𝑓𝑡(𝑟𝑒𝑠𝑝𝑜𝑛𝑠𝑒)
𝑓𝑓𝑡 𝑒𝑥𝑡𝑎𝑡𝑖𝑜𝑛 ⋅𝑓𝑓𝑡(𝑒𝑥𝑡𝑎𝑡𝑖𝑜𝑛)
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Grid overview
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Grid convergence static steady
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,0.0040
,0.0060
,0.0080
,0.0100
,0.0120
,0.0140
,0.0160
,0.0180
,0.0200
,0.3635
,0.3640
,0.3645
,0.3650
,0.3655
,0.3660
,0.3665
,0.3670
,0.3675
0.0E+00 1.0E-05 2.0E-05 3.0E-05 4.0E-05 5.0E-05
CD
CL
N-2/3
ct311-4 ETW159
CL
CD
,0.0129
,0.0131
,0.0133
,0.0135
,0.0137
,0.0139
,0.0141
,0.0330
,0.0335
,0.0340
,0.0345
,0.0350
,0.0355
,0.0360
0.0E+00 1.0E-05 2.0E-05 3.0E-05 4.0E-05 5.0E-05
CD
CL
N-2/3
ct311-5 ETW271
Global picture
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ct311-4
ETW159
ct311-5
ETW271
Global picture (video)
ct311-5 ETW271
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Global coefficients ct311-4 ETW159
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Global coefficients ct311-5 ETW271
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Global coefficients ct311-5 ETW271
ALE fixed
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Cp at wing root
ct311-4 ETW159 section 1
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
ct311-4
ct311-4 ETW159
ct311-4 ETW159 aepw
ct311-4 ETW159 aepw conj
Cp mid wing
ct311-4 ETW159 section 3
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
ct311-4
ct311-4 ETW159
ct311-4 ETW159 aepw
ct311-4 ETW159 aepw conj
Cp time resolved
ct311-4 ETW159 section 3
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Cp wing root
ct311-5 ETW271 section 1
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
ct311-5
ct311-5 ETW271
ct311-5 ETW271 aepw
ct311-5 ETW271 aepw conj
ct311-5-alefix
Cp mid wing
ct311-5 ETW271 section 3
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
ct311-5
ct311-5 ETW271
ct311-5 ETW271 aepw
ct311-5 ETW271 aepw conj
ct311-5-alefix
Cp time resolved
ct311-5 ETW271 section 3
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Issues encountered & challenges
Flow at wing root, effect of fuselage dummy
Periodicity of unsteady flow for ETW271 in some areas questionable
after only six periods of excitation
Scaling/normalizing of results, plus complex conjugate issue
ALE bug encountered
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Thank you for your attention!
Questions?
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Backup
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Unsteady pressure coefficients
ct311-4 ETW159 section 1
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Unsteady pressure coefficients
ct311-4 ETW159 section 2
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Unsteady pressure coefficients
ct311-4 ETW159 section 3
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Unsteady pressure coefficients
ct311-4 ETW159 section 4
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Unsteady pressure coefficients
ct311-4 ETW159 section 5
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Unsteady pressure coefficients
ct311-4 ETW159 section 6
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Unsteady pressure coefficients
ct311-4 ETW159 section 7
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Unsteady pressure coefficients
ct311-5 ETW271 section 1
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Unsteady pressure coefficients
ct311-5 ETW271 section 2
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Unsteady pressure coefficients
ct311-5 ETW271 section 3
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Unsteady pressure coefficients
ct311-5 ETW271 section 4
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Unsteady pressure coefficients
ct311-5 ETW271 section 5
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Unsteady pressure coefficients
ct311-5 ETW271 section 6
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Unsteady pressure coefficients
ct311-5 ETW271 section 7
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