[Wrf-users] Upper boundary cfl error (UNCLASSIFIED)

[Dr. Craig A. Mattocks]

The generation of noise over steep terrain (slopes greater than 30 degrees) at horizontal resolutions finer than 1 km is a well-known problem of terrain-following sigma-p coordinates.

See Katherine Lundquist's presentation at the WRF Workshop last year:

http://ams.confex.com/ams/7Coastal7Urban/techprogram/paper_126629.htm

and an upcoming article in Monthly Weather Review:

http://ams.allenpress.com/perlserv/?request=get-abstract&doi=10.1175%2F2009MWR2990.1

The authors have developed an Immersed Boundary Method (IBM) for WRF that overcomes these problems to simulate flow over steep complex terrain, such as urban landscapes.

- Craig