[90nash]

Hello Foamers,

I came across the term: Lagrangian Time Scale of turbulence in a paper and i cannot seem to get my head around it. Can anyone please explain what does it physically mean and how do i calculate it for an LES channel flow simulation?
The paper i am referring to performs tracking of non-spherical particles in a turbulent channel flow.
Quoting from the paper:
"From the initial conditions, simulations have run for 35 TL before starting to sample data, and the sampling is done for a time duration of 7 TL. TL represents the Lagrangian integral time scale of turbulence at the centre of channel"


Thanks

[FMDenaro]

Originally Posted by 90nash

Hello Foamers,

I came across the term: Lagrangian Time Scale of turbulence in a paper and i cannot seem to get my head around it. Can anyone please explain what does it physically mean and how do i calculate it for an LES channel flow simulation?
The paper i am referring to performs tracking of non-spherical particles in a turbulent channel flow.
Quoting from the paper:
"From the initial conditions, simulations have run for 35 TL before starting to sample data, and the sampling is done for a time duration of 7 TL. TL represents the Lagrangian integral time scale of turbulence at the centre of channel"


Thanks

have a look to classical turbulence books, it is defined by the time integral (extended up to +Inf) of the Lagrangian autocorrelation