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Added marine growth example in examples/02_Mooring_Analysis_MoorPy/05_moorings_cables_marine_growth
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‎examples/02_Mooring_Analysis_MoorPy/05_moorings_cables_marine_growth.py‎

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# -*- coding: utf-8 -*-
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"""
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Simple driver file to create an FAModel project and make a moorpy system model
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of the array including moorings and dynamic cables.
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The input file only contains the bare minimum information to build a moorpy
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array with moorings and dynamic cables (static cables are not modeled in MoorPy)
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For more information on MoorPy, please see MoorPy documentation at https://github.com/NREL/MoorPy
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"""
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from famodel import Project
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import matplotlib.pyplot as plt
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import numpy as np
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import os
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from copy import deepcopy
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# define name of ontology input file
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dir = os.path.dirname(os.path.realpath(__file__))
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input_file = os.path.join(dir,'05_moorings_cables_marine_growth.yaml')
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# initialize Project class with input file, we don't need RAFT for this so mark False
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project = Project(file=input_file,raft=False)
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# create moorpy array
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project.getMoorPyArray()
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# - - - Let's add marine growth to moorings and cables - - -
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# pick a mooring line to check that mg was added on
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moor_to_check = list(project.mooringList.values())[0]
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# pull out nominal diameter of top line section before adding marine growth
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reg_line_d = deepcopy(moor_to_check.ss.lineList[-1].type['d_nom'])
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print('\n-------------------Initial mooring line properties--------------------')
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print(moor_to_check.ss.lineList[-1].type) # top line section
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print('----------------------------------------------------------------------\n')
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# Note: all line properties for all sections of a mooring line can be accessed in moor_to_check.ss.lineTypes
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# to ge the specific line properties of a specific section of a mooring line, use moor_to_check.ss.lineList[x].type
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# where x is the index of the line section. Adding marine growth generally increases # of line sections
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# add marine growth to all mooring lines (mg added based on dict in yaml)
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print('Adding marine growth')
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project.getMarineGrowth(tol=2.5) # tol is tolerance for depth that the mooring line changes from one thickness to the next.
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# If tol=2.5 and thickness changes at -40 m, the thickness change can be -40 +/- 2.5 m
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print('\n----------Marine growth 0.05 m thick mooring line properties-----------')
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print(moor_to_check.ss.lineList[-1].type) # top line section
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print('----------------------------------------------------------------------\n')
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# pull out nominal diameter of top line section after applying marine growth
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mg_line_d = moor_to_check.ss.lineList[-1].type['d_nom']
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# at top, the nominal diameter should have increased 0.2 m (.1 m thickness on each side)
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print('\nPristine line nominal diameter just below surface: ',reg_line_d)
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print('Marine growth line nominal diameter just below surface: ',mg_line_d)
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# plot again just to make sure the mooring still looks right
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project.plot3d()
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‎examples/02_Mooring_Analysis_MoorPy/05_moorings_cables_marine_growth.yaml‎

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# Site inputs
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site:
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general:
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water_depth: 200
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marine_growth:
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keys: [thickness, lowerRange, upperRange, density]
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data: # (m) (m) (m) (kg/m^3)
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- [0.00,-200,-170, 1325] # no marine growth below 170 m depth
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- [0.01,-170,-40, 1325] # 10 mm marine growth between -170 m and -40 m, mg density 1325 kg/m^3
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- [0.05,-40,0, 1325] # 50 mm marine growth between -40 m and 0 m, mg density 1325 kg/m^3
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buoys: [0.01,0.01] # marine growth thickness on buoys (m)
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# ----- Array-level inputs -----
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# Wind turbine array layout
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array:
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keys : [ID, topsideID, platformID, mooringID, x_location, y_location, heading_adjust]
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data : # ID# ID# ID# [m] [m] [deg]
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- [fowt0, 0, 1, ms1, -1600, -1600, 0 ]
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- [fowt1, 0, 1, ms1, 0, -1600, 180 ]
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- [fowt2, 0, 1, ms1, 1600, -1600, 0 ]
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platform:
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type : FOWT
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rFair : 58
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zFair : -14
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# ----- Mooring system -----
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# Mooring system descriptions (each for an individual FOWT with no sharing)
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mooring_systems:
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ms1:
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name: 2-line semi-taut polyester mooring system with a third line shared
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keys: [MooringConfigID, heading, anchorType, lengthAdjust]
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data:
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- [ semitaut-poly_1, 150 , drag-embedment1, 0 ]
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- [ semitaut-poly_1, 270 , drag-embedment1, 0 ]
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- [ semitaut-poly_1, 30 , drag-embedment1, 0 ]
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# Mooring line configurations
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mooring_line_configs:
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# see 01_moorings.yaml in this folder or 01_Visualization/02_visual_moorings.yaml for explanation of each entry
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semitaut-poly_1: # mooring line configuration identifier, matches MooringConfigID
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name: Semitaut polyester configuration 1 # descriptive name
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span: 642 # 2D x-y distance from fairlead to anchor
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sections: #in order from anchor to fairlead
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- mooringFamily: chain # ID of a mooring line section type
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d_nom: .1549 # nominal diameter of material [m]
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length: 497.7 # [m] usntretched length of line section
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- connectorType: shackle
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- mooringFamily: polyester # ID of a mooring line section type
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d_nom: .182 # nominal diameter of material [m]
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length: 199.8 # [m] length (unstretched)
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# Anchor type properties
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anchor_types:
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drag-embedment1:
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type : DEA # type of anchor (drag-embedment anchor)
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# Array cables
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array_cables:
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keys: [ AttachA, AttachB, DynCableA, DynCableB, headingA, headingB, cableType]
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data:
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- [ fowt0, fowt1, suspended_1, None, 90, 90, None] # suspended cable, so only one dynamic cable configuration, no static cable
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- [ fowt1, fowt2, lazy_wave1, lazy_wave1, 240, 300, static_cable_66]
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# Dynamic and cable configurations
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dynamic_cable_configs:
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# contains the subsections that make up each section of the subsea dynamic cable (i.e., what sections make up the lazywave cable in array_cable_1)
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lazy_wave1:
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name: Lazy wave configuration 1
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voltage: 66 # [kV]
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span : 195 # [m] horizontal distance to end of dynamic cable from attachment point
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A: 300 # cable conductor area [mm^2]
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cable_type: dynamic_cable_66 # ID of a cable section type from famodel/cables/cableProps_default.yaml. Cable props loaded automatically from this!
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length: 353.505 # [m] length (unstretched)
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rJTube : 5 # [m] radial distance from center of platform that J-tube is located, can be used instead of a J-tube designation in the platform description
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sections:
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- type: Buoyancy_750m # name of buoy type from famodel/cables/cableProps_default.yaml - buoy design info read in automatically from this!
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L_mid: 200 # [m] length of cable from platform connection to midpoint of buoyancy section
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N_modules: 6 # number of buoyancy modules
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spacing: 11.23 # [m] spacing between buoyancy modules
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V: 1 # [m^3] volume of each buoyancy module, used to scale buoyancy module properties
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suspended_1:
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name: Dynamic suspended cable configuration 1
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voltage: 33 # [kV]
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span: 1512 # [m]
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cable_type: dynamic_cable_66 # ID of a cable section type from famodel/cables/cableProps_default.yaml. Cable props loaded automatically from this!
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A: 300 # cable conductor area [mm^2]
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length: 1500 # [m] length (unstretched)
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rJTube : 58 # [m] radial distance from center of platform that J-tube is located
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sections:
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- type: Buoyancy_750m
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L_mid: 510 # [m] from end A
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N_modules: 6
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spacing: 18 # [m]
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V: 2 # [m^3]
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- type: Buoyancy_750m
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L_mid: 1040 # [m] from end A
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N_modules: 6
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spacing: 18 # [m]
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V: 2 # [m^3]
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