Lagrangian Solvers in OpenFOAM - Are all parcels modelled as point particles?

stamufa · January 10, 2020, 05:39

Hello FOAMers,

I have a rather basic question about how Lagrangian particles are modelled in a solver like reactingParcelFoam. Are the parcels necessarily modelled as point particles with the required submodels? If not, what happens when a parcel is greater than the cell size at which it finds itself in?

Best,
Mustafa

GerhardHolzinger · January 13, 2020, 04:21

Particle location is always based on the location of the particle's center of gravity, i.e. its center, since all particles are assumed to be spherical.
Unless you are using the immersed boundary (IB) method, you violate many assumptions used in the CFD-DEM coupling, since it falls into the category of unresolved CFD-DEM. I.e. the particles are assumed to be much smaller than a cell of the mesh.

January 10, 2020, 05:39	Lagrangian Solvers in OpenFOAM - Are all parcels modelled as point particles?	#1
stamufa New Member Mustafa Join Date: Jun 2015 Location: Aachen Posts: 26 Rep Power: 11	Hello FOAMers, I have a rather basic question about how Lagrangian particles are modelled in a solver like reactingParcelFoam. Are the parcels necessarily modelled as point particles with the required submodels? If not, what happens when a parcel is greater than the cell size at which it finds itself in? Best, Mustafa

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January 13, 2020, 04:21		#2
GerhardHolzinger Senior Member Gerhard Holzinger Join Date: Feb 2012 Location: Austria Posts: 342 Rep Power: 29	Particle location is always based on the location of the particle's center of gravity, i.e. its center, since all particles are assumed to be spherical. Unless you are using the immersed boundary (IB) method, you violate many assumptions used in the CFD-DEM coupling, since it falls into the category of unresolved CFD-DEM. I.e. the particles are assumed to be much smaller than a cell of the mesh.