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  • Numerical verification exercises with different computer models for simulating sea circulation pattern : The vertical diffusion of momentum in a forced barotropic sea

Abstract

Three 3-D finite difference computer models of different origins are applied for simulating typical flow situations under idealised conditions. The specific concern of this report is the vertical diffusion of momentum in a barotropic, infinitely extended sea of shallow water, which is exposed to wind and a pressure gradient as driving forces for creating vertical shear and velocity profiles. Turbulent flows without the Coriolis force - the general turbulent Couette flow problem - and laminar (i.e. constant-viscosity) flows with the Coriolis force - the Ekman flow problem - are simulated. The model results are compared with analytic solutions for these situations. This comparison provides information on the step-size dependent space and time discretisation errors characteristic of the different models. Numerical instabilities are examined. For simulating the typical large turbulent velocity gradients near the sea-bottom and sea-atmosphere interfaces, a specific method, the shape function approach, is introduced and successfully tested.

Additional information

Authors: EIFLER W, JRC Ispra (IT);SCHRIMPF W, JRC Ispra (IT);KUPUSOVIC T, University of Sarajevo, Institute of Water Resources Engineering (YU)
Bibliographic Reference: EUR 13370 EN (1991) 121 pp., MF, ECU 8, blow-up copy ECU 16.25
Availability: (2)
Record Number: 199111266 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en