Tominaga 2011: Which solver for releasing a contaminant?

kingjewel1 · February 27, 2014, 05:45

I'd like to release a scalar/dye/contaminant from a volume or point source at a fixed location throughout my simulation- As per the following image.

Which solver/method would you use to model this in openfoam? I'm leaning towards simplifiedSiwek but

kingjewel1 · March 2, 2014, 10:07

speciesTransportFoam? Anybody done something similar to this? Just want to use a non-reacting tracer gas that includes turbulences and mass.

Lieven · March 2, 2014, 14:36

Hi Kingjewel,

Since it concerns a non-reacting tracer, the tracer does not affect the velocity field so you have two options:
1. If the velocity field is steady steate, you can first solve the flow field using an appropriate solver (e.g. simpleFoam). Next, you can use the generated velocity field in scalarTransportFoam to solve the dispersion. Note that this will require to modify the latter to account for the turbulence diffusion.
2. You can create your own solver which directly combines the two steps above.

Cheers,

L

kingjewel1 · March 2, 2014, 14:52

Quote:

Originally Posted by Lieven

Hi Kingjewel,

Since it concerns a non-reacting tracer, the tracer does not affect the velocity field so you have two options:
1. If the velocity field is steady steate, you can first solve the flow field using an appropriate solver (e.g. simpleFoam). Next, you can use the generated velocity field in scalarTransportFoam to solve the dispersion. Note that this will require to modify the latter to account for the turbulence diffusion.
2. You can create your own solver which directly combines the two steps above.

Cheers,

L

Thank you for the explanation. I envisaged using LES so ultimately being a transient flow. I have some reservations about using a pure scalar (mainly because of my experience from fluent) and maybe a gas like CO_2 might be more realistic. Any thoughts about a solver or procedure here?

Lieven · March 2, 2014, 17:18

With LES, the easiest will be to start from the pisoFoam or pimpleFoam and add the scalar transport equation to it. Basically combining the piso/pimpleFoam with scalarTransportFoam. You can compute the turbulent diffusion coefficient using the nuSgs of the LES model.

At first, I would start with a passive scalar (one-way coupling). Afterwards, you could add some complexity by adding the effect of the scalar on the wind field...

If you have any other questions, feel free to ask!

Cheers,

L

February 27, 2014, 05:45	Tominaga 2011: Which solver for releasing a contaminant?	#1
kingjewel1 Senior Member Join Date: Jul 2009 Posts: 260 Rep Power: 17	I'd like to release a scalar/dye/contaminant from a volume or point source at a fixed location throughout my simulation- As per the following image. Which solver/method would you use to model this in openfoam? I'm leaning towards simplifiedSiwek but

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March 2, 2014, 10:07		#2
kingjewel1 Senior Member Join Date: Jul 2009 Posts: 260 Rep Power: 17	speciesTransportFoam? Anybody done something similar to this? Just want to use a non-reacting tracer gas that includes turbulences and mass.

March 2, 2014, 14:36		#3
Lieven Senior Member Lieven Join Date: Dec 2011 Location: Leuven, Belgium Posts: 299 Rep Power: 22	Hi Kingjewel, Since it concerns a non-reacting tracer, the tracer does not affect the velocity field so you have two options: 1. If the velocity field is steady steate, you can first solve the flow field using an appropriate solver (e.g. simpleFoam). Next, you can use the generated velocity field in scalarTransportFoam to solve the dispersion. Note that this will require to modify the latter to account for the turbulence diffusion. 2. You can create your own solver which directly combines the two steps above. Cheers, L

March 2, 2014, 17:18		#5
Lieven Senior Member Lieven Join Date: Dec 2011 Location: Leuven, Belgium Posts: 299 Rep Power: 22	With LES, the easiest will be to start from the pisoFoam or pimpleFoam and add the scalar transport equation to it. Basically combining the piso/pimpleFoam with scalarTransportFoam. You can compute the turbulent diffusion coefficient using the nuSgs of the LES model. At first, I would start with a passive scalar (one-way coupling). Afterwards, you could add some complexity by adding the effect of the scalar on the wind field... If you have any other questions, feel free to ask! Cheers, L