OrcaFlex Manual - Orcina

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System Modelling: Data and Results, 6D Buoys 396 w Figure: Wire frames with different edge diameter. A value of '~' is used for the wire frame on the left and a value of 1m is used for the wire frame on the right. 6.9.8 Spar Buoy and Towed Fish Properties The figure below shows the geometry of a Spar Buoy. The buoy is specified relative to its own local frame of reference Bxyz. The Centre of Mass is specified relative to Bxyz. A Spar Buoy is modelled as a series of co-axial cylinders mounted end to end along the local z-axis. The geometry of a Towed Fish is identical except that the buoy axis is aligned with the x-axis of the buoy. The cylinders are numbered from the top downwards. So in the tables on the buoy data form the cylinder at the base of the stack (lowest x or z) appears at the bottom of the table. If you are modelling a CALM or SPAR buoy then see also Modelling a Surface-Piercing Buoy.
w Rotation 3 B (B=buoy origin) Buoy Axis Cylinder 1 OD Figure: Spar Buoy Geometry z Cylinder 1 Length y Rotation 1 Rotation 2 x Stack Base Position 397 System Modelling: Data and Results, 6D Buoys The shape of a Spar Buoy or Towed Fish is specified by the following data on the Geometry page on the buoy data form. Stack Base Centre Position The centre of the base of the stack, relative to buoy axes. Cylinders: Outer Diameter, Inner Diameter and Length The diameters of the cylinder and its length measured along the axis. These parameters define the buoy geometry from which buoyancy forces and moments are determined. When the buoy pierces the water surface, <strong>OrcaFlex</strong> allows for the angle of intersection between the sea surface and the buoy axis when calculating the immersed volume and centre of immersed volume, and includes the appropriate contributions to static stability. If the inner diameter is greater than zero then the cylinder is actually a hollow cylindrical pipe. The internal region of the cylinder contains sea water if the buoy is submerged. In this case then the contained water contributes to the buoy's inertia. These inertial effects are only included in directions normal to the buoy. The remaining parameters determine the hydrodynamic loads acting on each cylinder. Loads are calculated for each cylinder individually, then summed to obtain the total load on the buoy.
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w Orcina Ltd. Daltongate Ulverston
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Contents 4 w 3.4 Libraries 40 3.4.1
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Contents 6 w 5.6 Dynamic Analysis 1
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Contents 8 w 6.5.23 Wave Scatter Co
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Contents 10 w 8.12 Results 444 8.13
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Introduction, Installing OrcaFlex
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Introduction, Parallel Processing M
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Introduction, References and Links
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Introduction, References and Links
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w 2 TUTORIAL 2.1 GETTING STARTED 21
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w 23 Tutorial, Dynamic Analysis sha
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w 3 USER INTERFACE 3.1 INTRODUCTION
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w Simulation Paused 27 User Interfa
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w Keys on Main Window New model Ope
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w Rotate viewpoint left (decrement
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w General: StaticsMethod: Whole Sys
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w A text data file saved by OrcaFle
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w 37 User Interface, Model Browser
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w Cut/Copy Cut or Copy the selected
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w 3.4.1 Using Libraries 41 User Int
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w 43 User Interface, Libraries Once
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w 3.5.1 File Menu New Deletes all o
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w New Vessel New Line New 6D Buoy N
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w 3.5.5 View Menu Change Graphics M
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w Preferences 51 User Interface, Me
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w 53 User Interface, 3D Views 3D Vi
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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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Page 346 and 347: System Modelling: Data and Results,
Page 432 and 433: Modal Analysis, Theory 432 w For si
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Page 436 and 437: Fatigue Analysis, Commands 436 w Fo
Page 438 and 439: Fatigue Analysis, Load Cases Data f
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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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OrcaFlex Manual - Orcina

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