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ESLM is a parameter in the fort.15 file to set the horizontal eddy viscosity.

Usage Notes

A positive ESLM indicates a spatially constant horizontal eddy viscosity with dimensions [L²/T]. A negative value of ESLM invokes the Smagorinsky-type turbulence closure model[1] using a spatially constant coefficient equal to the absolute value of ESLM. Users should refer to the horizontal eddy viscosity section for more information.


  1. Smagorinsky, J. “General Circulation Experiments with the Primitive Equations.” Monthly Weather Review 91, no. 3 (March 1, 1963): 99–164. https://doi.org/10.1175/1520-0493(1963)091<0099:GCEWTP>2.3.CO;2.