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<font color="blue"><tt>Viscosity Coefficients</tt></font> <font color="red"><tt>==</tt></font><tt> 0.5, 0.05</tt> <br>
Not all HPC models will show an increase in run time when changing from the 2018pre 2020 to thepost 2020 releasereleases. Models that are controlled by the Wave Celerity or Courant Control Numbers and not the Diffusion Control Number are likely to be similar in runtime. Some models will be even faster with the last 2020 release due to other improvements. However, especially where the cell size is smaller than the depth, the Wu approach is vastly superior to the Smagorinsky, and the more sophisticated Wu solution may start causing the <u>[[HPC_Adaptive_Timestepping | Diffusion Control Number]]</u> to control the timestepping causing longer run times.<br>
Despite the possible increase in runtime for some models, the Wu turbulence scheme is warranted particularly as cell sizes are typically getting smaller.<br>
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