[Thangam]

Hi

I am simulating an unsteady turbulent jet where air is released into a quiescent medium of air. I am trying to add passive scalar to my inlet (like a dye or tracer and no reactions) for the following reasons:
1) To monitor the concentration change due to diffusion and mixing.
2) To have a better visualizations since I assume they would take different colors in post processing since they are two different species though both are air.(I have attached a picture (westerweel et al. 2009)

A couple of ways I thought to do this:

1) rewrite scalarTransportFoam for concentration instead of temperature.
2) use reactingFoam with exactly the same properties for the species with no reaction and no combustion. However I failed to understand the difference between reactingFoam and RhoReactingFoam and I believe both are for compressible flows.Hence, rewrite a solver for incompressible flows?
3) Use interFoam and use similar properties for both the fluids

However I am not sure if any of the above would work though!

Any thoughts would be appreciated!

Thanks!

[ybapat]

Hello,

I think you can use scalarTransportFoam directly as it is transient solver for passive scalar.

-Yogesh

[Thangam]

Thanks Yogesh. I guess the scalarTransportFoam solves for the temperature as the transported scalar which I dont require in my case. I need something like a tracer that varies in concentration as diffusion takes place.

[olivierG]

Hello,

Take a look at the function Object "scalarTransport". Just add it in you controlDict + tracer name in 0 dict, and your done. Work will most of OF solver.
You can find some example in this forum.

regards,
olivier

[cfd_inquirer]

hello there OliverG. I was trying to do what you said but it seemed like OpenFOAM ver 2.2.2 (what am using) doesn't recognize the

type scalarTransport

as a function object. :-(

Do you know where I could find such example? Thanks in advance.