Page History

...

While k and ε can be specified, they can also be related to more physically understandable parameters I and d. I is the turbulent intensity,

{latex} \large $$d_H$$ {latex}

{latex}
\large
$$
{I} = {0.16Re^{-1/8}}
$$
{latex}

{latex}
\large
$$
{d_H} = {d}
$$
{latex}

{latex}
\large
$$
{l} = {0.07d}
$$
{latex}

Note: for further understanding of model specifications, Fluent specifies certain constants as in the equations below. However, while these constants can be changed, Fluent initializes them at their standard values.

{latex}\large
$$
{\epsilon} = {C_\mu^{3/4}k^{3/2} \over l}
$$
{latex}

{latex}
\large
$$
{k} = {3 \over 2 (UI)^2}
$$
{latex}

Setup

Use the same case and data files as you downloaded and checked in the Laminar setup for the geometry and mesh, but save this case as 'Turbulent Jet'. 

...

In the Materials dialogue. change the viscosity for a higher Reynolds number:

{latex} \large $$ {Re} = {Ud \over \nu} = {10^5} $${latex}

The inlet jet velocity will remain at 1m/s; the inlet diameter is still 0.01m from the geometry (ignoring the larger diameter with 0m/s velocity inflow), so enter the viscosity for air as ν = 1E-7. Select Change/Create and then Close.

...