[Armin.Sh]

Hi dear FOAMers,

I'm going to run a Lagrangian particle tracking after running a transient simulation for the continuous phase, which means the carrier flow velocity changes in each time step.

On the other hand, it seems that the current particle tracking in OpenFOAM has only been considered for the steady carrier flows (with fixed, i.e. "frozen" velocity). In other words, it reads the data from the start time and doesn't consider the changes of the continuous phase flow velocity in the next time steps.

I tried to solve this issue by entering the following part into the solver code:

Info<< "Reading field U\n" << endl;
    volVectorField U
    (
        IOobject
        (
          "U",
          runTime.timeName(),
          mesh,
          IOobject::MUST_READ,
          IOobject::NO_WRITE
        ),
        mesh
    );

It reads now the velocity in each time step, but apparently still doesn't apply it to the solving equations, because the results are as before. In conclusion, it seems that I should now change the code, where the velocity is applied to the particle tracking equations.

I'd like to know if somebody knows, how to overcome this issue or at least where the code containing main equations for the Lagrangian particle tracking is.

Thanks in advance!
Armin