Revision as of 14:24, 3 February 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits No edit summary ← Older edit		Revision as of 14:26, 3 February 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits →Why is my model using 2020 HPC slower than 2018 HPC? Newer edit →
Line 72: <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 2018 to the 2020 release. Models that are controlled by the ~~wave~~Wave ~~celerity~~Celerity or Courant ~~control~~Control ~~numbers~~Numbers and not the ~~diffusion~~Diffusion ~~control~~Control ~~number~~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~~Diffusion ~~control~~Control ~~number~~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> <br>

HPC FAQ: Difference between revisions