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Model Response to Wind Forcing

Test Reference

  • Wang, S. S. Y, Jia, Y, Roche, P.J, Smith, P.E and Schmalz, R.A (2009). “Verification and Validation of 3D Free Surface Flow Models”, American Society of Civil Engineering.

Domain

  • Flat bottomed cuboid flume
  • 100,000 m length
  • 10,000 m width
  • Three flume orientations:
    • x axis aligned
    • y axis aligned
    • 45 degrees
  • Two mesh resolutions:
    • 500 m
    • 1,000 m

  • Four vertical layer resolutions:
    • 6 layers
    • 8 layers
    • 12 layers
    • 20 layers

wind domain

Initial Conditions

  • 40 meter water depth
  • Vertical eddy viscosity = 0.03 m2/s

Boundary Conditions

  • Constant wind in flume alignment direction
    • Shear stress of 0.1 N/m2
    • Shear stress of 0.5 N/m2
  • No time varying boundary conditions

Results

  • Analytic solutions:
    • Water surface elevation slope along the flume

             ​wind forcing solution

              wind forcing solution 2

  • Vertical velocity profile

        wind forcing vertical solution

wind forcing vertical solution 2

  • Model computed depths for the three flume orientations with a constant wind shear of 0.1 N/m2

wind results depths

  • Vertical velocity comparisons at mesh center with a constant wind shear of 0.1 N/m2

wind results velocity shear 0.1

  • Vertical velocity comparisons at mesh center with a constant wind shear of 0.5 N/m2

wind results velocity shear 0.5

Simulation Parameters

  • SGI Altix ICE 8200 (Diamond)
  • 8 processors
  • 13 minutes to 1.5 hour simulation times
  • PC simulations as well with equivalent results but 5-10 times longer run time