HPC FAQ: Difference between revisions

 

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 celerity or velocity 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 diffusion control number (the third one displayed) to control the timestepping causing longer run times.

 

= Why is my HPC model getting unstable right at the beginning? And why are my control numbers lower than they could be? =