I know that 3ddp is for a 3d mesh with a double precision,
but when is it used?? I havn't found it in help. Txema

it is used when you wan't double precision, meaning higher level of accuracy in the computer round off.

It consume more ram and require more time i think. Give it a try and compare results if you want to see what the difference is!

BR

Kasper Skriver

what about the using dp on 64 system and windows. As indicated by joans larrson(in his thesis) (Sys Admin of cfd-online)

Double-precision solvers are extremely useful when dealing with very sensitive analisys like aerodynamic drag prediction, multiphase systems, pollutant formation in very small fractions in multi-species+reactions in combustion systems, porous media with high resistance coefficients on highly skewed grids, an so on.

One very important thing to know: double precision solvers on 64-bit machines (and 64-bit executables, of course) are much more easily handled than on 32-bit machines (almost same memory requirements and more important, very little difference on execution times!). So don't aviod using them if you have Opterons or 64-bit Xeons.

Razvan