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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,
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{latex} \large $$d_H$$ {latex} |
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{latex} \large $$ {I} = {0.16Re^{-1/8}} $$ {latex} |
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{latex} \large $$ {d_H} = {d} $$ {latex} |
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{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.
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{latex}\large $$ {\epsilon} = {C_\mu^{3/4}k^{3/2} \over l} $$ {latex} |
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{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'.
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In the Materials dialogue. change the viscosity for a higher Reynolds number:
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{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.
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