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On the performance of a generic length scale turbulence model within an adaptive finite element ocean model

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Author(s)

  • Jon Hill
  • M.D. Piggott
  • David A. Ham
  • E.E. Popova
  • M.A. Srokosz

Department/unit(s)

Publication details

JournalOcean Modelling
DateE-pub ahead of print - 30 Jul 2012
DatePublished (current) - Oct 2012
Volume56
Number of pages15
Pages (from-to)1-15
Early online date30/07/12
Original languageEnglish

Abstract

Research into the use of unstructured mesh methods for ocean modelling has been growing steadily in the last few years. One advanta ge of using unstructured meshes is that one can concentrate resolution where it is needed. In addition, dynamic adaptive mesh optimisation (DAM O) strategies allow resolution to be concentrated when this is required. Despite the advantage that DAMO gives in terms of improving the spatia l resolution where and when required, small-scale turbulence in the oceans still requires parameterisation. A two-equation, generic length scal e (GLS) turbulence model (one equation for turbulent kinetic energy and another for a generic turbulence length-scale quantity) adds this param eterisation and can be used in conjunction with adaptive mesh techniques. In this paper, an implementation of the GLS turbulence parameterisati on is detailed in a non-hydrostatic, finite-element, unstructured mesh ocean model, Fluidity-ICOM. The implementation is validated by comparing to both a laboratory-scale experiment and real-world observations, on both fixed and adaptive meshes. The model performs well, matching labora tory and observed data, with resolution being adjusted as necessary by DAMO. Flexibility in the prognostic fields used to construct the error m etric used in DAMO is required to ensure best performance. Moreover, the adaptive mesh models perform as well as fixed mesh models in terms of root mean square error to observation or theoretical mixed layer depths, but uses fewer elements and hence has a reduced computational cost.

    Research areas

  • Unstructured mesh, Turbulence parameterisation, Adaptive mesh, Finite element

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