Reference / Input deck / solver / convergence control / viscosity ramp
viscosity ramp
Scales the effective viscosity, decaying log-linearly from initial to 1, lowering the effective Reynolds number early so the start is more diffusive. initial <= 1 disables it
initialrequired
float·required·> 0
Ramp value on the first pseudo cycle; the ramp eases to 1 from here
Used inatmosphere
Guidance: Choosing a time-marching scheme →cycles
float·default 300·> 0
Number of pseudo cycles over which the ramp reaches 1
Guidance: Choosing a time-marching scheme →