|January 14, 2015, 10:44||
Eulerian multiphase tracer transport - value of scalar?
Join Date: Mar 2014
Posts: 11Rep Power: 4
I believe the answer to my question is quite simple, but I couldn't find a clear definition for it:
I'm adding a scalar transport equation to an incompressible multiphase solver, where the scalar should only be transported by/in the liquid phase,
representing e.g. a solution of salt in water.
fvm::ddt(alpha1, Tracer) + fvm::div(fvc::interpolate(alpha1)*phi1, Tracer) - fvm::laplacian(fvc::interpolate(alpha1)*DT, Tracer)
my questions is about the "value" of the transported scalar:
1.) "Tracer" = mass(Tracer) per cell-volume (= concentration in each cell)?
... so to get the concentration in the liquid phase in each cell one has to divide "Tracer"-value by alpha1 (volumetric phase fraction of liquid phase)?
2.) the value for "Tracer" already represents the concentration in the liquid phase?
3.) anything else?
In short: Does the Tracer-value represent a concentration based on the cell volume or based on the liquid volume in each cell?
Or is a completely different approach necessary to get the concentration of e.g. a salt in the water phase for the evaluation of homogeneity inside the domain.
Thanks for your help!
Reading http://www.sciencedirect.com/science...85894714015587 helped me to understand that the second option should be correct.
Last edited by dschmidt; January 19, 2015 at 04:10.
|February 2, 2015, 00:21||
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,907Rep Power: 27
Yes, your equation is correct and refers to a tracer into the liquid phase (note that alpha_L is in all the terms).
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