Sentences with phrase «subgrid models»
"Subgrid models" refer to a technique used in numerical simulations or computer models to represent and understand smaller details or structures within a larger grid or system. It helps to simulate and study complex phenomena that cannot be explicitly resolved by the model's grid size. Full definition
know that subgrid models do not resolve actual weather patterns, therefore some parametrisation has to be involved, with all necessary assumptions / simplifications, implicit or explicit adjustment of fluxes, etc..
realclimate.org
These seasonal to yearly predictions are things that can respond very well to systematically rooting out problems with the models, both numerical problems as well as subgrid model problems.
As robust as the code is already, the HACC team continues to develop it further, adding significant new capabilities, such as hydrodynamics and associated subgrid models.
These have very interesting potential to do subgrid modeling in a more rigorous way and are superior as discretization methods for the Navier - Stokes equations.
That's how subgrid models are «tuned» after all.
So we come up with approximate approaches, referred to as subgrid models.»
If the models don't show these phenonena, which we know are present in fluid dynamics systems, they must be wrong in their modeling of resolvable scales or the subgrid models are very badly wrong or possibly both.
We then spent months tuning the computational grid and the subgrid model parameters (and adjusted the data in ways not fully reported) and then we agreed with the data almost perfectly.
The numerical methods are old and in some cases very poor, the subgrid models are dubious and even much simpler fluid dynamical systems can not be accurately be predicted even using more modern numerical methods.