Constant vertical mixing simply uses a constant diffusion coefficient for mixing everywhere in the domain.

Table: Constant vertical mixing namelist
&vmix_const_nml LANL
default
CESM1
default
Constant vertical mixing coefficients
const_vvc0.250.25vertical viscosity coefficient (momentum mixing) (cm2/s)
const_vdc0.250.25vertical diffusivity coefficient (tracer mixing) (cm2/s)
/