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uosilos February 3, 2021 06:22
DispersionModel
 
Hi,

I have tried to compile a lagrangian solver based on coalChemistryFoam adding MPPIC and Colliding features in OF8.

When I run the solver it only recognizes as dispersionModel "none".

I noticed we have /intermediate/submodels/kinematic/dispersionmodel where the noDispersion is places, and the turbulence/submodels/kinematic/dispersionmodel where we have the DispersionRASModels: StochasticRASDispersion and GradientDispersionRAS.

In the own definition of DispersionRASModel it includes DispersionModel file,
Does anybody know which is the difference between the two "Dispersion" styles.


Thanks :D

uosilos February 8, 2021 04:36
Quote:
Originally Posted by uosilos (Post 795188)
Hi,

I have tried to compile a lagrangian solver based on coalChemistryFoam adding MPPIC and Colliding features in OF8.

When I run the solver it only recognizes as dispersionModel "none".

I noticed we have /intermediate/submodels/kinematic/dispersionmodel where the noDispersion is places, and the turbulence/submodels/kinematic/dispersionmodel where we have the DispersionRASModels: StochasticRASDispersion and GradientDispersionRAS.

In the own definition of DispersionRASModel it includes DispersionModel file,
Does anybody know which is the difference between the two "Dispersion" styles.


Thanks :D

:confused::confused::confused:

oswald February 8, 2021 15:27
Roughly speaking, both do the same regarding the magnitude of the perturbance. The direction is either opposite to the direction of grad(k) for gradientDispersion and in a random direction for stochastic dispersion. I think this is also described in the headers of the "*DispersionRAS.H"-files. Hope this helps!

uosilos February 9, 2021 03:30
Quote:
Originally Posted by oswald (Post 795649)
Roughly speaking, both do the same regarding the magnitude of the perturbance. The direction is either opposite to the direction of grad(k) for gradientDispersion and in a random direction for stochastic dispersion. I think this is also described in the headers of the "*DispersionRAS.H"-files. Hope this helps!

Thanks a lot Oswald.


I refer to the fact that they are kind of split in those two directories (lagrangian/intermediate and lagrangian/turbulence), with "creating" files being quite different (dispersionModel vs dispersionRASModel), more than to their theoretical nature.



Unfortunately this structure is not ideal for developing new classes...


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