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ACKNOWLEDGMENTS I would first like to acknowledge Dr. Rick Lind for providing steady guidance and motivation throughout my doctoral experience. I thank the other members of my committee, Dr. Andreas Haselbacher, Dr. Lawrence Ukeiley, and Dr. Panos Pardalos for their patience and insight in reviewing my research and providing comments on the directions of my work. Additionally, thanks go out to the members of the Air Force SEEK EAGLE Office, specifically Dr. Chuck Denegri, James Dubben, Dr. Scott Morton, and David McDaniel, for their continued support. Thanks go to Ben Shirley for providing additional support and funding. Finally, I would like to thank my family for their patience and support during these busy past few years. Thanks to my mother, Cindy, sister, Tiffany, and brother, Austin for always cheering me on. Thanks to my mother- and father-in-laws, Helen and Ed for always believing in me. This work would not have been possible without the love, support, and understanding of my husband, Dodjie, who always encouraged me to keep going and picked up all of the parenting responsibilities when I was unable to do my share. I thank my son, Markus, for giving me a reason to smile every day. 4
TABLE OF CONTENTS ACKNOWLEDGMENTS ...............................................................................................................4 LIST OF TABLES ...........................................................................................................................8 LIST OF FIGURES .........................................................................................................................9 ABSTRACT ...................................................................................................................................14 CHAPTER 1 INTRODUCTION ..................................................................................................................16 page Motivation ...............................................................................................................................16 Approach Overview ................................................................................................................17 Contributions ..........................................................................................................................18 2 FLUTTER AND LIMIT CYCLE OSCILLATIONS .............................................................20 Introduction .............................................................................................................................20 Dynamic Aeroelasticity ..........................................................................................................20 Flutter ......................................................................................................................................20 Limit Cycle Oscillation ...........................................................................................................23 LCO Representative Case: F16 .......................................................................................24 Current LCO Analysis Techniques .................................................................................25 LCO Flight Testing ..........................................................................................................27 Previous LCO Research Techniques ......................................................................................30 GVT .................................................................................................................................30 Doublet-lattice .................................................................................................................31 ZAERO ............................................................................................................................31 Harmonic Balance ...........................................................................................................31 Neural Networks ..............................................................................................................32 CFD-FASTRAN ..............................................................................................................32 CAP-TSD ........................................................................................................................32 NONLINAE ....................................................................................................................33 Other CFD .......................................................................................................................34 3 ANALYSIS TOOLS ...............................................................................................................40 Introduction .............................................................................................................................40 Fluid-Structure Reaction Approach ........................................................................................40 Cobalt Flow Solver .................................................................................................................40 5
Page 1 and 2: TEMPORAL ANALYSIS OF TRANSONIC FLOW
Page 3: To Dodjie 3
Page 7 and 8: Summary ...........................
Page 9 and 10: LIST OF FIGURES Figure page 2-1 F-1
Page 11 and 12: 6-9 Lissajous plots of upper surfac
Page 13 and 14: 6-45 2-D (left column) and 3-D (rig
Page 15 and 16: incrementally since this capability
Page 17 and 18: are not sufficient to provide an an
Page 19 and 20: 4. Contribute to the work of others
Page 21 and 22: Classical aircraft flutter is chara
Page 23 and 24: Popular methods for finding the sol
Page 25 and 26: LCO amplitude but not the mechanism
Page 27 and 28: speed for the particular configurat
Page 29 and 30: Denegri 23 explains the flutter fli
Page 31 and 32: Doublet-lattice Denegri 1, 7,12,13
Page 33 and 34: Batina’s work and uses an F-16 ha
Page 35 and 36: As a result of Denegri’s previous
Page 37 and 38: Figure 2-1. F-16 store stations. Fi
Page 39 and 40: Figure 2-5. Flutter flight test bui
Page 41 and 42: Stokes (RANS) equations on hybrid u
Page 43 and 44: CHAPTER 4 ANALYSIS TECHNIQUES Intro
Page 45 and 46: time-localization cannot be determi
Page 47 and 48: A B C D E Figure 4-3. Analysis of s
Page 49 and 50: (CFD) analyses in order to capture
Page 51 and 52: the appropriate time step for the n
Page 53 and 54: Wing1, is the wing-only (no fuselag
Page 55 and 56:
similar to DES but with modificatio
Page 57 and 58:
Figure 5-1. Time step comparison of
Page 59 and 60:
A B Figure 5-3. Flow results for 8
Page 61 and 62:
A B Figure 5-5. Flow results for 8
Page 63 and 64:
Figure 5-7. Turbulence model compar
Page 65 and 66:
Figure 5-9. CFD vs. wind tunnel com
Page 67 and 68:
Figure 5-11. CFD vs. wind tunnel co
Page 69 and 70:
Figure 5-13. CFD vs. wind tunnel co
Page 71 and 72:
server cluster comprised of 5,120 p
Page 73 and 74:
of oscillation. The 88% span locati
Page 75 and 76:
since it is proportional to lift, a
Page 77 and 78:
of phase. Figure 6-10 B) and D) are
Page 79 and 80:
The instantaneous Cp measurements p
Page 81 and 82:
D Lissajous plots with time being t
Page 83 and 84:
frequency of 8Hz. The wavelet plot
Page 85 and 86:
vortex is observed travelling outbo
Page 87 and 88:
near 70% chord and the second near
Page 89 and 90:
expected from a lift curve slope. A
Page 91 and 92:
shape of this Lissajous is nonlinea
Page 93 and 94:
occurring at harmonics, and assumes
Page 95 and 96:
the same direction of rotation on t
Page 97 and 98:
the roll cycle, and the black arrow
Page 99 and 100:
B) shows the fast Fourier transform
Page 101 and 102:
is that shock separation aft of the
Page 103 and 104:
on the upper surface, a much larger
Page 105 and 106:
Figure 6-1. F-16 wing planform with
Page 107 and 108:
A C B Figure 6-4. DDES of F-16 in s
Page 109 and 110:
Cp (Non-dimensional) Cp (Non-dimens
Page 111 and 112:
-Cp (Non-dimensional) A -Cp (Non-di
Page 113 and 114:
Page 115 and 116:
-Cp (Non-dimensional) A Time (sec)
Page 117 and 118:
A B Figure 6-14. DDES-SARC of F-16
Page 119 and 120:
Page 121 and 122:
Figure 6-18. Lissajous plots of upp
Page 123 and 124:
-Cp (Non-dimensional) Frequency (Hz
Page 125 and 126:
-Cp (Non-dimensional) A Frequency (
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
A B D Figure 6-40. DDES of F-16 in
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Impact on Future Design of Aircraft
Page 159 and 160:
The size of the Mach=1 iso-surface
Page 161 and 162:
these cases in order to identify th
Page 163 and 164:
15. Dawson, K. S., and Sussinham, J
Page 165 and 166:
41. Thomas, J. P., Dowell, E. H., a
Page 167 and 168:
67. Cunningham, A. M., Jr., and den
Page 169 and 170:
93. Parker, G. H., Maple, R. C., an
Page 171 and 172:
121. Travin, A. K., Shur, M. L., Sp
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