v2026.11.16174
Reference / Input deck / solver / equations / velocity perturbation

velocity perturbation

Initial random velocity seed for shear-driven turbulence (LES spin-up)

kindrequiredamplituderequireddepth
kindrequired
required

Position-hashed +/-amplitude seed on all three components

Options
ValueWhat it does
random

Independent pseudo-random perturbations of up to amplitude either side of zero on each velocity component, hashed from each cell's position and applied only below depth. The seed is reproducible and independent of the partitioning.

Used inatmosphere
amplituderequired
float·required·> 0.0 m/s

Peak perturbation on each velocity component

Used inatmosphere
depth
float·default 50·> 0.0 m

Height below which the seed is applied; zero above

Used inatmosphere