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12.21 Providing an Initial Guess for $k$ and $\epsilon$ (or $k$ and $\omega$)

For flows using one of the $k$- $\epsilon$ models, one of the $k$- $\omega$ models, or the RSM, the converged solutions or (for unsteady calculations) the solutions after a sufficiently long time has elapsed should be independent of the initial values for $k$ and $\epsilon$ (or $k$ and $\omega$). For better convergence, however, it is beneficial to use a reasonable initial guess for $k$ and $\epsilon$ (or $k$ and $\omega$).

In general, it is recommended that you start from a fully-developed state of turbulence. When you use the enhanced wall treatment for the $k$- $\epsilon$ models or the RSM, it is critically important to specify fully-developed turbulence fields. Guidelines are provided below.

Note that, for the RSM, Reynolds stresses are initialized automatically using Equations  12.20-1 and 12.20-2.

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