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Numerical filters (presentation, 2002)
Article published on June 2002
last modification on 21 June 2007

Presentation of Piet Termonia during the ALATNET training course on Numerical Analysis in Kranjska Gora, 29-31 May 2002.

Generalities :

  • why do we need filters in the first place ?
  • set the stage : notions, spectral, types
  • NWP: discretization and truncation
  • increasing the efficiency
  • discussion

The specific LAM coupling problem seen as a filter

  • introduction
  • spurious reflections
  • flow relaxation : Davies scheme
  • implementation in ALADIN
  • discussion