OrcaFlex Manual - Orcina

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System Modelling: Data and Results, Lines 352 w Bend Radius, x-Bend Radius, y-Bend Radius, Bend Radius component, In-plane Bend Radius, Out-of-plane Bend Radius Available at mid-segment points and line ends. The magnitude of bend radius, its components in the local x and ydirections, its component in the user specified local direction theta and its components in the in-plane and out-ofplane directions, as defined above. When pre-bend is modelled these results are reported relative to the pre-bent curvature. Torque Notes: Bend radius is defined to be 1 / curvature. If the curvature is 0 then a value of 'Infinity' is reported. When using non-linear bend stiffness, the reported mid-segment curvature depends on whether the bend stiffness is specified to be hysteretic or not. For details see the note in the Non-linear Bend Stiffness section. Warning: Bend radius results are accurate only if the segment length is sufficiently short. The accuracy can be estimated by performing a sensitivity study on segment length in the area of interest. Available at mid-segment points and line ends only, and available only for lines with torsion included. The component of structural moment along the line axis. Contact Line Clearance Results Line Centreline Clearance, Line Clearance Available at mid-segment points and line ends. These line clearance results report shortest distances between the segment or line end and the segments of other lines in the model. These distances can be either the shortest distance between centrelines (Line Centreline Clearance) or the shortest distance between outer edges (Line Clearance). The results selection form lets you choose to report clearances either: � from this line to all other lines or � from this line to a specified other line. In the text below we refer to the other lines used in the clearance calculations as the clearance lines, be they all other lines or a single specified other line. Line Centreline Clearance reports the centreline clearance from this line to the clearance lines. More precisely, the clearance reported for a segment is the shortest distance from the centreline of the segment to the centreline of any segment on the clearance lines. Note that the clearance reported therefore does not allow for the radii of the lines involved. When clearance is reported for a line end it reports the shortest distance from the centreline of the point at the end node to the centreline of any segment on the clearance lines. Line Clearance is similar but it reports the clearance between line outer edges, allowing for their contact diameters. Note: Line Clearance can report negative values. This means that the segments in question are penetrating each other. If clashing is being modelled for both segments then a clash force will result from this penetration. The line clearance variables are useful for checking for clashing between lines. They are available in both range graph and time history form. The range graph, for a given period of the simulation, enables you to see where on the line clashing may be a problem. You can then examine the time history of line clearance for that point on the line, to see when closest approach occurs. You can then use the replay to examine which other line is coming closest. It is sometimes worth choosing carefully which line to check for clearance. An example is checking for clashing between a single mooring line and one or more of a number of closely spaced flowlines. Let us assume that you are reporting clearances from all other lines. The clearance graphs for the flowlines will include clearance to the other flowlines, between which clashing may not be a concern. The mooring line clearance is probably more useful, since it only includes clearance to the flowlines. Line clearance only checks against other lines, not against edges of vessels, buoys, etc. However you can check clearance against part of a vessel, for example, by attaching a dummy single-segment line to the vessel, spanning across the area of interest. The line clearance graphs for that dummy line will then show how close other lines come to that area of the vessel. Notes: For mid-segment points the segment used is the one containing the selected arc length.
w 353 System Modelling: Data and Results, Lines Line clearance results are only available if there are at least 2 lines in the model. Warning: For complex models, building and updating clearance graphs can be slow. Having "live" clearance graphs open while a simulation is running can significantly slow down the simulation. Line Clashing Results Note: As well as the results variables documented below <strong>OrcaFlex</strong> also provides a Line Clashing Report. Line Clash Force Available at mid-segment points. The magnitude of the clash force between this segment and other lines. Please note that this variable is only available if clash checking has been included for the lines concerned. See Line Clashing for details. Line Clash Force is given for the segment containing the selected arc length and results are available in the form of time histories and range graphs. If multiple clashes occur simultaneously on the same segment then the value reported is the magnitude of the vector sum of the clash forces involved. Line Clash Impulse Available at mid-segment points. The integral of Line Clash Force with respect to time. Line Clash Energy Available at mid-segment points. Clash energy is calculated by integrating the magnitude of clash force with respect to depth of penetration. Suppose that this segment is denoted by S1 and segment S2 is another segment which S1 is in contact with. The clash energy for the spring/damper representing contact between these 2 segments is calculated by integrating the magnitude of clash force with respect to depth of penetration. This then is the potential energy in the spring/damper. If multiple clashes occur simultaneously on the same segment then the value reported is the sum of all individual clash energies between this segment and other segments. Line Contact Results Line Contact Force, Line Contact x-Force, Line Contact y-Force, Line Contact z-Force Available at nodes. Line Contact Force is the magnitude of the total force per unit length, due to Line Contact with any of the lines in the model with which it has a specified line contact relationship. Line Contact x-Force, Line Contact y-Force and Line Contact z-Force are the components of that total Line Contact Force in the line's node Nx-, Ny- and Nz-axes directions. Solid Contact Results Solid Contact Force Available at nodes. The magnitude of the total force per unit length, due to contact with any of the elastic solids in the model. Seabed Contact Results Seabed Clearance Available at nodes. The clearance is the shortest distance between the node and any point on the seabed, allowing for the contact diameter. The value reported is for the node that is nearest the specified arc length. A negative value indicates that the node is in contact with the seabed. This result is not available for 3D seabeds because it is difficult to calculate. Instead you should use Vertical Seabed Clearance. Vertical Seabed Clearance Available at nodes. The clearance is the vertical distance between the node and the seabed, allowing for the contact diameter. The value reported is for the node that is nearest the specified arc length. A negative value indicates that the node is in contact with the seabed.
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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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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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