Net structure with wake

Class containing a net object.

Collaboration diagram for Net structure with wake:

Author

Karl-Johan Reite

Todo:

Finish documentation and make complete example file.

Example configuration excerpt

<Lib
   LibName                = "marine_elements"
   SimObject              = "Net/NetStructure"
   Name                   = "NET"
   UseTagForExternalNodes = "true"
   AddedDragPerMPS        = "0"
   File                   = "NetStructureInput.xml"
   WakeEffectBetweenElementsOn      = "false"
   WakeEffectBetweenTwinesInElementsOn      = "false"
   UseActualElementSizeInWakeEffect      = "true"
   NumBarsInWakeEffectCalc      = "100"
   UseReynoldsDependentDragCoefficient      = "false"
   UseScreenModelForHydrodynamicForce      = "false"
   UseDragCoeffFromMoeFore2021      = "false"
   SnFromImageAnalysis      = "0.4"
   RhoWater      = "1025"
   NetTotalForceCheck      = "0,0,0"
/>

Example NetStructure configuration file

The simobjects input-file takes an argument File (or BinaryFile), which specifies a path to a file. This file contains parameters general to the Net Structure component, and specific to the cable objects.

<Net>
   <General
      MaxNumPanels           = "100"
      MaxNumCables           = "100"
      MaxNumNodes            = "6"
      MinElementLength       = "1"
      MaxElementLengthFactor = "1025"
      MaxStepLength          = "1"
      MaxTension             = "1e-10"
      MeanTension            = "1e10"
      MinLength              = "0"
      StepSafetyFactor       = "50"
      AdaptationPeriod       = "0"
      MassFactor             = "1"
      MaxAcceleration        = "1e20"
      MaxVelocity            = "0"
      Scale                  = "1"
      FoldingPointRefinement = "0"
      TwineColour            = "1,1,1,1"
   />
   <ExternalNodeMap
      NodesInputForce        = "0,0,0"
      NodesOutputPosAndVel   = "0,0,0"
   </
   <NetElements
      Name         = "7"
      Conn         = "0,0,0,0"
      PosAMesh     = "0,0"
      PosBMesh     = "0,0"
      PosCMesh     = "0,0"
      PosDMesh     = "0,0"
      BarD         = "0"
      BarL         = "0"
      BarE         = "0"
      BarRho       = "0"
      Refinefactor = "1"
      TwineColour  = "1,1,1,1"
   />
  <CableElements
      Conn                    = "0,0,0,0"
      Name                    = "???"
      D                       = "0"
      L                       = "0"
      E                       = "0"
      Rho                     = "0"
      RefineFactor            = "1"
      MaxTension              = "100e4"
      MaxStep                 = "1000"
      MeanTension             = "0"
      MinLength               = "0.001"
      StepSafetyFactor        = "50"
      AdaptationPeriod        = "0"
      NoOfFoldingPoints       = "0"
      TangentialFrictionCoeff = "0.03"
      NormalDragCoeff         = "1.2"
      Material                = "Trawl/Wire2"
      DrawScale               = "1.0"
      NumFaces                = "5"
      NumSpheres              = "5"
      SphereD                 = "0.05"
      SphereMass              = "10"
      SpherePos               = "0,0,0"
      NumDisks                = "2"
      DiskD                   = "0.1"
      DiskThickness           = "0.001"
      DiskMass                = "10"
      DiskPos                 = "1,0,0"
   />
</Net>

Input Ports

Name	Width	Description
<???>Force...<???>Force	3	Only if external node tags are used ...
ExternalForce<???>...ExternalForce<???>	3	Only if external node tags are NOT used ...

Output Ports

Name	Width	Description
<???>Force...<???>Force	3	Only if external node tags are used ...
<???>ExternalForce...<???>ExternalForce	3	Only if external node tags are NOT used ...
<???>Pos...<???>Pos	3	Only if external node tags are used...
<???>ExternalPos...<???>ExternalPos	3	Only if external node tags are NOT used ...
<???>Vel...<???>Vel	3	Only if external node tags are used ...
<???>ExternalVel...<???>ExternalVel	3	Only if external node tags are NOT used ...
BottomContact	6	???
VelNorm	1	???
StrainEnergy	1	???

Configuration parameters in the main input file to the NetStructure-simObject

Name	Width	Description
???	???	???

Configuration parameters in the General-tag of the input file in the Net-tag.

Name	Width	Description
???	???	???

Configuration parameters in the ExternalNodeMap-tag of the input file in the Net-tag.

Name	Width	Description
???	???	???

Configuration parameters in the NetElements-tag of the input file in the Net-tag.

Name	Width	Description
???	???	???

Configuration parameters in the CableElements-tag of the input file in the Net-tag.

Name	Width	Description
???	???	???

Initial conditions

Name	Width	Description
Pos_1...Pos_<???>	3	???
Vel_1...Vel_<???>	3	???

Full example file

Todo:

Add complete example file.

This SimObject is referred to as Net/NetStructureWakeEffect