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