LocalWaveVessels.xml

<Contents>
   <!--
   Three LocalWaveVessel hulls of 12, 20 and 40 m in a 1.5 m irregular sea, drawn in the ocean
   of the environment.
 
   The sea is a JONSWAP spectrum, mean period 6 s, travelling south (MainDirectionDeg 180).
   The hulls lie still, 40 m north of the origin, with headings that give head seas (12 m,
   heading north), beam seas (20 m, heading east) and bow-quartering seas (40 m, heading
   north-east).
 
   The 12 and 40 m hulls are the 20 m workboat Froude-scaled by 0.6 and 2: lengths and GM
   scale by s, areas by s^2, mass by s^3, inertias and RollQuadraticDamping by s^5.
   SampleLevel grows with the length so the sample spacing stays below the shortest waves
   with energy (about 6 m; see "Short waves" in the model's documentation).
 
   The live view needs a visualization build and the <Visualization> observer below;
   simulationSpeed="1" runs it in real time. The
   camera starts at NED (-30, 0, 0) looking north towards the hulls.
   -->
   <OBJECTS>
      <Lib
         LibName              = "marine_elements"
         SimObject            = "Vessel/LocalWaveVessel"
         Name                 = "Small"
         Length               = "12"
         Breadth              = "3.6"
         Mass                 = "32400"
         RollInertia          = "46656"
         PitchInertia         = "349920"
         A33                  = "32400"
         A44                  = "9331"
         A55                  = "349920"
         GMT                  = "0.48"
         GML                  = "15"
         RollQuadraticDamping = "15552"
         SampleLevel          = "2"
      />
      <Lib
         LibName              = "marine_elements"
         SimObject            = "Vessel/LocalWaveVessel"
         Name                 = "Medium"
         Length               = "20"
         Breadth              = "6"
         Mass                 = "150000"
         RollInertia          = "6.0e5"
         PitchInertia         = "4.5e6"
         A33                  = "1.5e5"
         A44                  = "1.2e5"
         A55                  = "4.5e6"
         GMT                  = "0.8"
         GML                  = "25"
         RollQuadraticDamping = "2.0e5"
         SampleLevel          = "3"
      />
      <Lib
         LibName              = "marine_elements"
         SimObject            = "Vessel/LocalWaveVessel"
         Name                 = "Large"
         Length               = "40"
         Breadth              = "12"
         Mass                 = "1.2e6"
         RollInertia          = "1.92e7"
         PitchInertia         = "1.44e8"
         A33                  = "1.2e6"
         A44                  = "3.84e6"
         A55                  = "1.44e8"
         GMT                  = "1.6"
         GML                  = "50"
         RollQuadraticDamping = "6.4e6"
         SampleLevel          = "4"
      />
      <Lib
         LibName                    = "environment"
         SimObject                  = "Environment"
         Name                       = "Environment"
         Waves.Spectrum             = "JONSWAP"
         Waves.Theory               = "Airy"
         Waves.Hs                   = "1.5"
         Waves.MeanPeriod           = "6"
         Waves.MainDirectionDeg     = "180"
         Waves.DirectionCosinePower = "10"
         Waves.NumWaves             = "40"
         Bathymetry.Depth           = "1000"
         Visual.WorldRadius         = "500"
      />
   </OBJECTS>
 
   <INTERCONNECTIONS>
      <Connection
         Small.Position  = "40,-35,0"
         Small.Rotation  = "0,0,0"
         Medium.Position = "40,0,0"
         Medium.Rotation = "0,0,1.5707963"
         Large.Position  = "40,45,0"
         Large.Rotation  = "0,0,0.7853982"
      />
   </INTERCONNECTIONS>
 
   <INITIALIZATION>
      <InitialCondition
         Small.Motion      = "0,0,0"
         Small.MotionRate  = "0,0,0"
         Small.Excitation  = "0,0,0"
         Medium.Motion     = "0,0,0"
         Medium.MotionRate = "0,0,0"
         Medium.Excitation = "0,0,0"
         Large.Motion      = "0,0,0"
         Large.MotionRate  = "0,0,0"
         Large.Excitation  = "0,0,0"
      />
   </INITIALIZATION>
 
   <SIMULATION simulationSpeed="1">
      <Timing TStart="0" TEnd="600"/>
      <Integrator Method="RK45_i">
         <StepControl StepMax="0.05" StepMin="1e-10" AbsTol="1e-3" RelTol="1e-3"/>
      </Integrator>
   </SIMULATION>
 
   <OBSERVERS>
      <FileOutput TOutput="0, 0:0.5:600, 600" Select="objects:all"/>
      <Visualization frameRate="25"/>
   </OBSERVERS>
</Contents>