OrcaFlex Manual - Orcina

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Contents 6 w 5.6 Dynamic Analysis 132 5.6.1 Calculation Method 133 5.6.2 Ramping 135 5.7 Friction Theory 135 5.8 Spectral Response Analysis 138 5.9 Extreme Value Statistics Theory 139 5.10 Environment Theory 141 5.10.1 Buoyancy Variation with Depth 141 5.10.2 Current Theory 141 5.10.3 Seabed Theory 142 5.10.4 Seabed Non-Linear Soil Model Theory 143 5.10.5 Morison's Equation 149 5.10.6 Waves 150 5.11 Vessel Theory 157 5.11.1 Vessel Rotations 157 5.11.2 RAOs and Phases 158 5.11.3 RAO Quality Checks 160 5.11.4 Current and Wind Loads 161 5.11.5 Stiffness, Added Mass and Damping 164 5.11.6 Impulse Response and Convolution 165 5.11.7 Wave Drift and Sum Frequency Loads 166 5.11.8 Manoeuvring Load 171 5.11.9 Other Damping 171 5.12 Line Theory 172 5.12.1 Overview 172 5.12.2 Structural Model Details 174 5.12.3 Calculation Stages 175 5.12.4 Calculation Stage 1 Tension Forces 175 5.12.5 Calculation Stage 2 Bend Moments 176 5.12.6 Calculation Stage 3 Shear Forces 179 5.12.7 Calculation Stage 4 Torsion Moments 179 5.12.8 Calculation Stage 5 Total Load 180 5.12.9 Line End Orientation 180 5.12.10 Line Local Orientation 181 5.12.11 Treatment of Compression 181 5.12.12 Contents Flow Effects 182 5.12.13 Line Pressure Effects 183 5.12.14 Pipe Stress Calculation 184 5.12.15 Pipe Stress Matrix 185 5.12.16 Hydrodynamic and Aerodynamic Loads 187 5.12.17 Drag Chains 189 5.12.18 Line End Conditions 191 5.12.19 Interaction with the Sea Surface 191 5.12.20 Interaction with Seabed and Shapes 192 5.12.21 Clashing 192 5.13 6D Buoy Theory 195 5.13.1 Overview 195 5.13.2 Lumped Buoy Added Mass, Damping and Drag 197
w 7 Contents 5.13.3 Spar Buoy and Towed Fish Added Mass and Damping 198 5.13.4 Spar Buoy and Towed Fish Drag 201 5.13.5 Slam Force 203 5.13.6 Contact Forces 205 5.14 3D Buoy Theory 205 5.15 Winch Theory 206 5.16 Shape Theory 208 6 SYSTEM MODELLING: DATA AND RESULTS 211 6.1 Modelling Introduction 211 6.2 Data in Time History Files 212 6.3 Variable Data 214 6.3.1 External Functions 215 6.4 General Data 217 6.4.1 Statics 217 6.4.2 Dynamics 219 6.4.3 Integration & Time Steps 220 6.4.4 Explicit Integration 220 6.4.5 Implicit Integration 222 6.4.6 Numerical Damping 223 6.4.7 Response Calculation 223 6.4.8 Results 223 6.4.9 Drawing 224 6.4.10 Properties Report 224 6.5 Environment 225 6.5.1 Sea Data 225 6.5.2 Sea Density Data 226 6.5.3 Seabed Data 227 6.5.4 Wave Data 230 6.5.5 Data for Regular Waves 232 6.5.6 Data for Random Waves 232 6.5.7 Data for JONSWAP and ISSC Spectra 233 6.5.8 Data for Ochi-Hubble Spectrum 234 6.5.9 Data for Torsethaugen Spectrum 235 6.5.10 Data for Gaussian Swell Spectrum 235 6.5.11 Data for User Defined Spectrum 235 6.5.12 Data for Time History Waves 236 6.5.13 Data for User Specified Components 237 6.5.14 Data for Response Calculation 237 6.5.15 Waves Preview 237 6.5.16 Modelling Design Waves 238 6.5.17 Setting up a Random Sea 240 6.5.18 Current Data 242 6.5.19 Wind Data 244 6.5.20 Drawing Data 245 6.5.21 External Functions 246 6.5.22 Results 246
Page 1: w Orcina Ltd. Daltongate Ulverston
Page 4 and 5: Contents 4 w 3.4 Libraries 40 3.4.1
Page 8 and 9: Contents 8 w 6.5.23 Wave Scatter Co
Page 10 and 11: Contents 10 w 8.12 Results 444 8.13
Page 12 and 13: Introduction, Installing OrcaFlex
Page 14 and 15: Introduction, Parallel Processing M
Page 16 and 17: Introduction, References and Links
Page 18 and 19: Introduction, References and Links
Page 21 and 22: w 2 TUTORIAL 2.1 GETTING STARTED 21
Page 23 and 24: w 23 Tutorial, Dynamic Analysis sha
Page 25 and 26: w 3 USER INTERFACE 3.1 INTRODUCTION
Page 27 and 28: w Simulation Paused 27 User Interfa
Page 29 and 30: w Keys on Main Window New model Ope
Page 31 and 32: w Rotate viewpoint left (decrement
Page 33 and 34: w General: StaticsMethod: Whole Sys
Page 35 and 36: w A text data file saved by OrcaFle
Page 37 and 38: w 37 User Interface, Model Browser
Page 39 and 40: w Cut/Copy Cut or Copy the selected
Page 41 and 42: w 3.4.1 Using Libraries 41 User Int
Page 43 and 44: w 43 User Interface, Libraries Once
Page 45 and 46: w 3.5.1 File Menu New Deletes all o
Page 47 and 48: w New Vessel New Line New 6D Buoy N
Page 49 and 50: w 3.5.5 View Menu Change Graphics M
Page 51 and 52: w Preferences 51 User Interface, Me
Page 53 and 54: w 53 User Interface, 3D Views 3D Vi
Page 55 and 56: w 55 User Interface, 3D Views � D
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w 57 User Interface, 3D Views a lin
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w 59 User Interface, 3D Views � F
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w Replay Period 61 User Interface,
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w Frame interval in real time 63 Us
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w Numeric 65 User Interface, Data F
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w � For lines you must specify th
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w 69 User Interface, Results this i
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w 71 User Interface, Results Let th
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w 73 User Interface, Results remain
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w Results 75 User Interface, Result
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w Replays 77 User Interface, Graphs
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w Axes 79 User Interface, Spreadshe
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w Command Line Parameters 81 User I
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w Wire Frame Graphics Codec 83 User
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Automation, Batch Processing Multi-
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Automation, Batch Processing 88 w N
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Automation, Batch Processing Assign
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Automation, Batch Processing Line T
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Automation, Batch Processing SHEAR7
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Automation, Batch Processing PolarT
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Automation, Batch Processing Figure
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Automation, Text Data Files Data in
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Automation, Text Data Files Selecte
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Automation, Text Data Files SHEAR7L
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Automation, Text Data Files 4.3.2 A
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Automation, Post-processing 108 w F
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Automation, Post-processing 110 w N
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Automation, Post-processing Referen
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Automation, Post-processing Command
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Automation, Post-processing Figure:
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w 5 THEORY 5.1 COORDINATE SYSTEMS 1
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w 125 Theory, Object Connections Di
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w 127 Theory, Static Analysis Final
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w 129 Theory, Static Analysis metho
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w 131 Theory, Dynamic Analysis for
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w Static Starting Position Simulati
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w 135 Theory, Friction Theory The n
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w where μ = magnitude of the vecto
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w 139 Theory, Extreme Value Statist
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w where σ = GPD scale parameter ξ
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w 143 Theory, Environment Theory Th
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w where Pu(z) = Nc(z/D)su(z)D Pu-su
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w 147 Theory, Environment Theory
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w Repenetration Offset After Uplift
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w 151 Theory, Environment Theory sp
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w Extrapolation Stretching 153 Theo
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w 155 Theory, Environment Theory st
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w 157 Theory, Vessel Theory individ
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w 159 Theory, Vessel Theory RAOs ca
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w 161 Theory, Vessel Theory Notes:
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w 163 Theory, Vessel Theory ω is t
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w surge/sway/heave M M.L roll/pitch
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w 167 Theory, Vessel Theory that co
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w 169 Theory, Vessel Theory separat
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w 171 Theory, Vessel Theory At this
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w Segment 1 Segment 2 Segment 3 Act
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w 175 Theory, Line Theory � If to
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w where component of M2 in the Sx2
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w The hysteresis model is described
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w � (90,90,90) sets Ex along -GX,
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w = v1 + p' + ω×p Therefore its a
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w y End A Stress ID z Stress OD O S
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w 5.12.16 Hydrodynamic and Aerodyna
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w 189 Theory, Line Theory Another w
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w Drag Chain Seabed Interaction 191
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w 193 Theory, Line Theory OrcaFlex
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w 195 Theory, 6D Buoy Theory clashi
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w 197 Theory, 6D Buoy Theory For Lu
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w 199 Theory, 6D Buoy Theory (due t
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w 201 Theory, 6D Buoy Theory Note:
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w α is the angle between the relat
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w 5.13.6 Contact Forces Contact For
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w Dynamic Analysis 207 Theory, Winc
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w 209 Theory, Shape Theory Finally,
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System Modelling: Data and Results,
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Modal Analysis, Theory 432 w For si
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Modal Analysis, Theory 434 w This h
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Fatigue Analysis, Commands 436 w Fo
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Fatigue Analysis, Load Cases Data f
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Fatigue Analysis, Load Cases Data f
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Fatigue Analysis, Analysis Data 442
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Fatigue Analysis, Integration Param
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Fatigue Analysis, Fatigue Points Ba
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Fatigue Analysis, How Damage is Cal
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VIV Toolbox, Frequency Domain Model
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VIV Toolbox, Time Domain Models 460
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VIV Toolbox, Time Domain Models Fil
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