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eddy viscosity vs dynamic viscosity??

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Old   August 11, 2014, 04:36
Question eddy viscosity vs dynamic viscosity??
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shahrul
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Hi all,

Anyone know whether eddy viscosity and dynamic viscosity are same or not?


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Old   August 11, 2014, 04:54
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No, they are definitely not the same. The dynamic viscosity is a macroscopic fluid property ... you can think of it as what distinguishes honey and water. The "eddy viscosity" is a flow property emerging from the increased momentum transport through the flow field due to turbulent velocity fluctuations.

In many turbulence models, the latter is included as an additional viscosity term and it is calculated from local turbulence properties in the flow field. (E.g. in the ubiquitous k-epsilon model, this is expressed \mu_t = C_{\mu} \rho \frac{k^2}{\epsilon}, which is then added to the viscosity term in the averaged momentum equation.)
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