[Mojtaba.a]

Hello all,

We already know that while running a simulation a huge amount of data, is stored on the RAM at each time step. Some are written on the disk, called by the main solver code (like U p etc) and some are written on the disk because of the FOs we have added to the controlDict file. Fair enough.

Ok now. After finishing the run. All unwritten data are removed from the RAM storage and all you have as data is what is written on the disk inside the time directories. Right?

So how is it when I run (buoyantCavity tutorial in buoyantSimpleFoam solver):

buoyantSimpleFoam -postProcess -func writeObjects

having configured the writeObjects FO as followed:

type            writeObjects;
libs            ("libutilityFunctionObjects.so");

objects         (rho);

writeControl    writeTime;

It writes out the rho field in each time step? How does it know the values of rho when the simulation is actually finished?

Does it use a reverse kind of formulation (Computing the rho field based on the other existing fields) or what?

Bests,
Mojtaba

[HPE]

`rho` is always available as a `rhoField` type.
It is retrieved from the turbulence model being used.
If the simulation is incompressible, it is just a `geometricOneField`, and if not, a `volScalarField`.
Hope it helps.