OrcaFlex Manual - Orcina

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Contents 10 w 8.12 Results 444 8.13 Automation 445 8.14 Fatigue Points 446 8.15 How Damage is Calculated 446 9 VIV TOOLBOX 449 9.1 Frequency Domain Models 449 9.1.1 VIVA 449 9.1.2 SHEAR7 453 9.2 Time Domain Models 460 9.2.1 Wake Oscillator Models 463 9.2.2 Vortex Tracking Models 466 9.2.3 VIV Drawing 472
w 1 INTRODUCTION 11 Introduction, Installing OrcaFlex Welcome to OrcaFlex (version 9.6a), a marine dynamics program developed by Orcina for static and dynamic analysis of a wide range of offshore systems, including all types of marine risers (rigid and flexible), global analysis, moorings, installation and towed systems. OrcaFlex provides fast and accurate analysis of catenary systems such as flexible risers and umbilical cables under wave and current loads and externally imposed motions. OrcaFlex makes extensive use of graphics to assist understanding. The program can be operated in batch mode for routine analysis work and there are also special facilities for post-processing your results including fully integrated fatigue analysis capabilities. OrcaFlex is a fully 3D non-linear time domain finite element program capable of dealing with arbitrarily large deflections of the flexible from the initial configuration. A lumped mass element is used which greatly simplifies the mathematical formulation and allows quick and efficient development of the program to include additional force terms and constraints on the system in response to new engineering requirements. In addition to the time domain features, modal analysis can be performed for either the whole system or for individual lines. RAOs can be calculated for any results variable using the Spectral Response Analysis feature. OrcaFlex is also used for applications in the Defence, Oceanography and Renewable energy sectors. OrcaFlex is fully 3D and can handle multi-line systems, floating lines, line dynamics after release, etc. Inputs include ship motions, regular and random waves. Results output includes animated replay plus full graphical and numerical presentation. If you are new to OrcaFlex then please see the tutorial and examples. For further details of OrcaFlex and our other software, please contact Orcina or your Orcina agent. Copyright notice Copyright Orcina Ltd. 1987-2012. All rights reserved. 1.1 INSTALLING ORCAFLEX Hardware Requirements OrcaFlex can be installed and run on any computer that has: � Windows XP, Windows Vista, Windows 7 or Windows 8. Both 32 bit and 64 bit versions of Windows are supported. � If you are using small fonts (96dpi) the screen resolution must be at least 1024×768. If you are using large fonts (120dpi) the screen resolution must be at least 1280×1024. However, OrcaFlex is a powerful package and to get the best results we would recommend: � A 64 bit edition of Windows 7 or later. � A powerful processor with fast floating point and memory performance. This is the most important factor since OrcaFlex is a computation-intensive program and simulation run times can be long for complex models. � At least 4GB of memory. This is less important than processor performance but some aspects of OrcaFlex do perform better when more memory is available, especially on multi-core systems. If you have a multi-core system with a 64 bit version of Windows then you may benefit from fitting even more memory. � A multi-core system to take advantage of OrcaFlex's multi-threading capabilities. � As much disk space as you require to store simulation files. Simulation files vary in size, but can be hundreds of megabytes each for complex models. � A screen resolution of 1280×1024 or greater with 32 bit colour. � A DirectX 9 compatible graphics card with at least 256MB memory for the most effective use of the shaded graphics facility. � Microsoft Excel (Excel 2000, or later) in order to use the OrcaFlex automation facilities. Both 32 bit and 64 bit versions of Excel are supported. Installation To install OrcaFlex:
Page 1: w Orcina Ltd. Daltongate Ulverston
Page 4 and 5: Contents 4 w 3.4 Libraries 40 3.4.1
Page 6 and 7: Contents 6 w 5.6 Dynamic Analysis 1
Page 8 and 9: Contents 8 w 6.5.23 Wave Scatter Co
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 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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Fatigue Analysis, Commands 436 w Fo
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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, How Damage is Cal
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