next up previous contents
Next: Model Output Up: Model Code and Numerics Previous: Spherical Geometry

Horizontal Viscosity

To help keep the model numerically stable, an explicit viscosity is added to the system through variables viscx and viscy (set in subroutine DriveInit). This viscosity is equivalent to the tex2html_wrap_inline2004 coefficient in the advection-diffusion operators (e.g. equation 5.11 and 5.12 in Neelin and Zeng [1]), with one subtle difference. In the model, instead of making tex2html_wrap_inline2004 isotropic, tex2html_wrap_inline2004 is specified separately for the x and y-directions. Thus, the diffusion term tex2html_wrap_inline2014 is actually represented as tex2html_wrap_inline2016 in the model.

Johnny Wei-Bing Lin
Wed Aug 26 16:58:31 PDT 1998