# Eulerian multiphase tracer transport - value of scalar?

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 January 14, 2015, 10:44 Eulerian multiphase tracer transport - value of scalar? #1 New Member   Dominik Schmidt Join Date: Mar 2014 Posts: 11 Rep Power: 5 Dear Foamers, 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. Code: fvm::ddt(alpha1, Tracer) + fvm::div(fvc::interpolate(alpha1)*phi1, Tracer) - fvm::laplacian(fvc::interpolate(alpha1)*DT, Tracer) Assuming this part is correct (please correct me, if it isn't), 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)? or 2.) the value for "Tracer" already represents the concentration in the liquid phase? or 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! Dominik EDIT: 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 #2 Senior Member   Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,911 Rep Power: 28 Yes, your equation is correct and refers to a tracer into the liquid phase (note that alpha_L is in all the terms). __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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