A Finite Volume Coastal Ocean Model Peter C Chu and Chenwu Fan Naval Postgraduate School Monterey, California, USA.

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Presentation transcript:

A Finite Volume Coastal Ocean Model Peter C Chu and Chenwu Fan Naval Postgraduate School Monterey, California, USA

Four Types of Numerical Models Spectral Model (not suitable for oceans due to irregular lateral boundaries) Finite Difference (z-coordinate, sigma- coordinate, …) Finite Element Finite Volume

Finite Volume Model Transform of PDE to Integral Equations Solving the Integral Equation for the Finite Volume Flux Conservation

Dynamic and Thermodynamic Equations Continuity Momentum Thermodynamic

Integral Equations for Finite Volume Continuity Momentum Thermodynamic

Time Integration of Phi-Equation

Comparison Between Finite Difference (z- and sigma-coordinates) and Finite Volume Schemes

Seamount Test Case

Initial Conditions V = 0 S = 35 ppt H T = 1000 m

Known Solution V = 0 Horizontal Pressure Gradient = 0

Evaluation Princeton Ocean Model Seamount Test Case Horizontal Pressure Gradient (Finite Difference and Finite Volume)

Numerics and Parameterization Barotropic Time Step: 6 s Baroclinic Time Step: 180 s Delta x = Delta y = 8 km Vertical Eddy Viscosity: Mellor-Yamada Scheme Horizontal Diffusion: Samagrinsky Scheme with the coefficient of 0.2

Error Volume Transport Streamfunction

Temporally Varying Horizontal Gradient Error The error reduction by a factor of 14 using the finite volume scheme.

Temporally Varying Error Velocity The error velocity reduction by a factor of 4 using the finite volume scheme.

Conclusions Use of the finite volume model has the following benefit: (1) Computation is as simple as the finite difference scheme. (2) Conservation on any finite volume. (3) Easy to incorporate high-order schemes (4) Upwind scheme