OrcaFlex Manual - Orcina

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System Modelling: Data and Results, Environment Sea State Table 248 w These data specify the random sea state scatter table. If the Regular Wave Scatter option is User specified then these data are not required. Spectral Form All the sea states are assumed to be of the same spectral form which can be either JONSWAP or ISSC. Note: The Longuet-Higgins, 1983 method is valid only for narrow-banded spectra. Thus the Ochi-Hubble and Torsethaugen spectra are not available for this type of conversion. Spectral Parameters If you select the JONSWAP spectral form you have 3 options for specifying the spectral parameters: Automatic, Partially Specified or Fully Specified. This setting applies to all sea states. Sea States You must specify the spectrum for each sea state in your scatter table. If you have selected the ISSC spectral form then you enter Hs and one of Tz, Tp or fm. If you have selected the JONSWAP spectrum the required parameters depend on the selected parameter option: � For Automatic parameters you set Hs and Tz and the program calculates and reports Tp and fm. � For Partially Specified parameters Tz, Tp and fm are tied together, so setting any one of them sets the other two to match. You must also set Hs. � For Fully Specified parameters Tp and fm are tied together, so setting one of them sets the other to match. The program calculates and reports Hs and Tz. You must also set Gamma, Alpha, Sigma1 and Sigma2. Number of Occurrences For each sea state in your scatter table you must also specify the number of occurrences of that sea state. This data is required to determine the relative likelihood of occurrence of each sea state. Normally this data comes from a sea state scatter table where it is usually presented in parts per thousand. Regular Waves (scatter table calculated from irregular wave scatter table) These data specify how the regular wave scatter table is discretised into bins. Wave Heights, Wave Periods These are the regular wave heights and wave periods that you wish to analyse. OrcaFlex automatically constructs bins around these values. The output from the wave scatter conversion tool includes a table listing these bins. Total Duration This is the total duration to be covered by the regular wave scatter table. Occurrence threshold Some of the bins in the regular wave scatter table can have very small occurrence values. In order to reduce the amount of computation time required to analyse all the load cases it is customary to ignore such bins. Any bin which has an occurrence value lower than this threshold will be ignored. If you do not wish to ignore any bins then you should set the threshold to 0. Regular Waves (user specified regular wave scatter table) These data specify a complete regular wave scatter table. Number of bins The number of bins in the regular wave scatter table. Wave Height, Wave Period, Number of Occurrences These are specified for each bin in the regular wave scatter table.
w Output 249 System Modelling: Data and Results, Environment To perform the wave scatter conversion you simply click the Show Regular Wave Scatter Table button which is found on the Regular Waves page. This command is also available from the Action menu. Note that this button is not available if you have a user specified regular wave scatter table. The output is presented in a spreadsheet window which, like all such windows in OrcaFlex, can be saved as an Excel file. The spreadsheet is made up of the following sheets: Sea State Table This sheet contains the input data which specified the sea state scatter table. Regular Wave Bins The regular wave height and wave period bins are listed here. Regular Wave Scatter Table This sheet contains the main output from the wave scatter conversion – a table listing the number of occurrences of waves in each regular wave bin. Any bins which have occurrences below the occurrence threshold are omitted. This sheet also displays the total number of bins and the total probability covered by the table. This latter value provides an important check that your bins extend far enough along the wave height and period axes. If the value is significantly less than 1 then your bins need to be extended. Batch Script Once you have obtained the regular wave scatter table you will usually want to generate a regular wave simulation file for each regular wave bin. The Export Batch Script button can be used to write an OrcaFlex batch script file to automate the generation of these simulation files. Alternatively the Create Script Table Spreadsheet button can be used to create a script table spreadsheet which can be pasted into an OrcaFlex Excel spreadsheet. To use these options you need to specify the following things. Base Case File Name The name of an OrcaFlex data file on which all the load cases are to be based. This data file should specify a regular wave. The batch script file sets the wave height and period together with the simulation duration. If you have already saved the wave scatter data then relative paths can be used when locating this file. Simulation File Name Template Each load case simulation file (corresponding to a single regular wave bin) is given a name in the batch script file. These names are based on this template. Special format strings can be used to customise the simulation file names as follows: � %N will be replaced with the load case number. Each load case is assigned a unique number. � %H will be replaced with the wave height for that load case. � %T will be replaced with the wave period for that load case. The default value of the template is "Case #%N, H=%H, T=%T" and this will lead to simulation files named, for example: "Case #01, H=0.5, T=3.sim", "Case #02, H=0.5, T=5.sim" and so on for all load cases. Note: You do not need to use all 3 format strings in your template. However, you must use enough of them to make the simulation file names unique. OrcaFlex will display an error message if the simulation file names are not unique. Batch script load case action � If Run and save simulation is selected then the batch script will be written using the Run command. This option should be checked if you plan to generate all the load cases on a single machine. � If Save Data file is selected then the batch script will be written using the SaveData command. This option is intended for use with Distributed OrcaFlex. When run, the script produces an OrcaFlex data file for each regular wave load case and these load cases can then be submitted to Distributed OrcaFlex.
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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, Text Data Files Data in
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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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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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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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OrcaFlex Manual - Orcina

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