Which model to use?

Kaeros · December 4, 2018, 06:02

Dear all,

I would like to simulate the following case:

- 2D transport of a scalar with turbulence
- Part of the domain contains elements that are sinks for the given scalar (i.e.: they absorb a given quantity of the scalar, generating a negative flux in # mmol m-2 s-1).
- I would like to impose velocity, pressure and turbulence quantities across the domain at every time step (i.e.: the model should only "worry" about transporting the scalar, with a fixed concentration profile at the inlet, to the outlet)

I was looking at OpenFOAM, which is open-source and has a way to simulate turbulence and scalar transport...but I do not understand if it's possible to set a sink for the tracer (maybe as a boundary condition?).

Any suggestion would be welcome!

AliE · December 4, 2018, 10:35

Hi,

yes openFOAM could be helpful, it offeres several RANS/URANS models that may fit your needs. However keep in mind that if your source terms and boundary condition are too specific, it is possible that you have to implement them by yourself using codestream. If you are not experinced in CFD, than this might create you some troubles

In any case you can check the available bcs and source terms (called fvOptions in OF) with a fast google search.

FMDenaro · December 4, 2018, 10:45

Quote:

Originally Posted by Kaeros

Dear all,

I would like to simulate the following case:

- 2D transport of a scalar with turbulence
- Part of the domain contains elements that are sinks for the given scalar (i.e.: they absorb a given quantity of the scalar, generating a negative flux in # mmol m-2 s-1).
- I would like to impose velocity, pressure and turbulence quantities across the domain at every time step (i.e.: the model should only "worry" about transporting the scalar, with a fixed concentration profile at the inlet, to the outlet)

I was looking at OpenFOAM, which is open-source and has a way to simulate turbulence and scalar transport...but I do not understand if it's possible to set a sink for the tracer (maybe as a boundary condition?).

Any suggestion would be welcome!

I don't know what is your goal but if you are simply considering a passive tracer having the motion governed by the lagrangian tracking, it is simply unphysical the simulation on a 2d turbulent field as it represents only a statistical solution.

LuckyTran · December 5, 2018, 11:47

The sink can be done using a fvOptions file. Or you can directly code it into the solver. Either way you have to do some coding.

December 4, 2018, 06:02	Which model to use?	#1
Kaeros New Member Federico Carotenuto Join Date: Dec 2018 Posts: 1 Rep Power: 0	Dear all, I would like to simulate the following case: - 2D transport of a scalar with turbulence - Part of the domain contains elements that are sinks for the given scalar (i.e.: they absorb a given quantity of the scalar, generating a negative flux in # mmol m-2 s-1). - I would like to impose velocity, pressure and turbulence quantities across the domain at every time step (i.e.: the model should only "worry" about transporting the scalar, with a fixed concentration profile at the inlet, to the outlet) I was looking at OpenFOAM, which is open-source and has a way to simulate turbulence and scalar transport...but I do not understand if it's possible to set a sink for the tracer (maybe as a boundary condition?). Any suggestion would be welcome!

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December 4, 2018, 10:35		#2
AliE Senior Member Join Date: Dec 2017 Posts: 153 Rep Power: 8	Hi, yes openFOAM could be helpful, it offeres several RANS/URANS models that may fit your needs. However keep in mind that if your source terms and boundary condition are too specific, it is possible that you have to implement them by yourself using codestream. If you are not experinced in CFD, than this might create you some troubles In any case you can check the available bcs and source terms (called fvOptions in OF) with a fast google search.

December 5, 2018, 11:47		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	The sink can be done using a fvOptions file. Or you can directly code it into the solver. Either way you have to do some coding.