Domain & resolution
First you should decide if your final(!) simulation (see "Cascading" below) should be on a regional or a global grid and at which resolution you want to run. For this it is important to know that:
- the more grid points a grid has, the more cores are needed and
- the smaller the resolution and with that the model timestep the longer the simulation will take.
Number of points
Topology (MPI & OpenMP)
Resolution → timestep
The relation between the horizontal resolution and the model timestep is linear. Here are some examples:
Resolution [degree] | Resolution [km] | model timestep [sec] | For GY grid |
---|---|---|---|
0.009° | ~1 km | 30 s | |
0.0225° | ~2.5 km | 60 s | |
0.036° | ~4 km | 90 s | |
0.11° | ~12 km | 300 s | |
~25 km | 720 s | Grd_nj = 417 | |
~55 km | 1800 s | Grd_nj = 171 |
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