Advanced Ocean Modelling: Using Open-Source Software by Jochen Kämpf

By Jochen Kämpf

This publication introduces the reader to complex tools utilized in the computer-based modelling of fluid techniques. This contains nonhydrostatic approaches reminiscent of breaking inner waves and density-driven convection, however the version code can be used to simulate an El-Niño occasion! The publication comprises 25 useful workouts, utilizing freely to be had Open-Source software program suites, that are popular by means of the clinical neighborhood. during this publication, the paintings of hydrodynamic modelling is made on hand and obvious to a much wider readership. an enticing byproduct of the e-book is that effects are animations instead of nonetheless photographs. version codes and animation scripts for all routines are provided on an internet site. The reader can undertake version codes for personal autonomous studies

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The first true Bernoulli equation, however, was derived by Euler (1755). 4 Results As anticipated, the initial density anomaly produces a density-driven flow spreading toward the right-hand side of the model domain (Fig. 15). This flow forms an isolated plume head. Counter-clockwise vortices forming in the lee of this head induce vigorous mixing. 0095 m s−2 , h o = 100 m, and h ≈ 40 m, the Bernoulli equation (Eq. 1 m/s. 2 m/s around this value. It should be highlighted that the model appears capable of simulating turbulence initiated by vertical shear of the horizontal flow and the breaking of internal waves.

11) where z ∗ is (positive) distance from the sea surface. 12) which is consistent with Eq. 5). For deep-water waves, water particles move in circular orbits with a radius of orbits decreasing rapidly (exponentially) with depth. 2% of that at the surface. This implies that such waves attain vanishingly small orbital speeds near the seafloor. Orbital motion in shallow-water waves are elliptical near the sea surface and horizontal (simply back and forth) at the sea bottom. Shallow-water waves, if energetic enough, are capable of eroding sediment from the sea floor.

This can be rather time consuming, particularly for three-dimensional model applications. 5 Boundary Conditions for Variable Bathymetry Variable bathymetry requires flow normal to a solid boundary to vanish. To this end, a logical array is used as to indicate whether a grid cell is “dry” or “wet”. Horizontal and vertical velocity components are kept at zero values in dry grid cells during a simulation. Owing to the staggered nature of the Arakawa-C grid (see Fig. 3), additional conditions are required to make sure the absence of flow across solid boundaries.

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