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Now that we are moving to the physgrid I think it could be useful to have a table that compares various aspects of typical pg2 and np4 grids.
Formulas:
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For the formulas, note that NP is normally 4 (ex. ne30np4) and NPG is normally 2 (ex. ne30pg2)
NE | np4 # physics columns |
|---|
...
pg2 # physics columns |
|---|
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np4 approx grid spacing |
|---|
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pg2 approx grid spacing |
|---|
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) |
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NE | np4 # physics columns | pg2 # physics columns | np4 approx grid spacing | pg2 approx grid spacing | ||
|---|---|---|---|---|---|---|
4 | 866 | 384 | 7.50 | 11.25 | 834.9 | 1252.3 |
8 | 3,458 | 1,536 | 3.75 | 5.63 | 417.4 | 626.2 |
11 | 6,536 | 2,904 | 2.73 | 4.09 | 303.6 | 455.4 |
16 | 13,826 | 6,144 | 1.88 | 2.81 | 208.7 | 313.1 |
30 | 48,602 | 21,600 | 1.00 | 1.50 | 111.3 | 167.0 |
45 | 109,352 | 48,600 | 0.67 | 1.00 | 74.2 | 111.3 |
60 | 194,402 | 86,400 | 0.50 | 0.75 | 55.7 | 83.5 |
120 | 777,602 | 345,600 | 0.25 | 0.38 | 27.8 | 41.7 |
256 | 3,538,946 | 1,572,864 | 0.12 | 0.18 | 13.0 | 19.6 |
512 | 14,155,778 | 6,291,456 | 0.06 | 0.09 | 6.5 | 9.8 |
1024 | 56,623,106 | 25,165,824 | 0.03 | 0.04 | 3.3 | 4.9 |
2048 | 226,492,418 | 100,663,296 | 0.01 | 0.02 | 1.6 | 2.4 |
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