1D Modelling of Mechanical Ventilation Network in OpenFOAM

charles4allme · May 15, 2018, 10:12

Hello,

I am running a fire simulation in a compartment and I would like to implement a ventilation model for the mechanical ventilation system.. I would like to use multiscale modelling method which means that I would represent the ventilation network with a 1D model. I am still a beginner with OpenFOAM and I would like to develop a 1D model for the ventilation network. Is that possible solely with OpenFOAM or woud I have to use another software to implement a 1D model and couple it with OpenFOAM.

piu58 · May 16, 2018, 01:51

In general, OF works with 3d (unavoidable). There exist a b.c. to reduce the complexity to 2 or (rarely used) 1 dimensions: empty. You need to use only 1 element in the dimension(s) you wish to suppress.

There are many examples for 2D, from which you may learn how to set an 1D geometry.

charles4allme · May 16, 2018, 08:51

@piu58: Thanks for your reply. Where can I find the examples for the 2D. Are they the ones in OpenFOAM tutorials? Am guessing it will still be possible to set a boundary condition that I would be using in the 1D model. When you say i need to only use 1 element in the dimensions I wish to suppress, am guessing you mean during setting up by mesh right?

Best regards

piu58 · May 16, 2018, 09:17

> examples for the 2D. Are they the ones in OpenFOAM tutorials?

Yes, I meant these.

> only use 1 element in the dimensions I wish to suppress, am guessing you mean during setting up by mesh right?

yes.

charles4allme · May 16, 2018, 11:25

Thanks a lot.

Is it also possible to create a solver that can solve the 1D geometry in OpenFOAM using the governing equations but for one dimensional case.

Thanks.

May 15, 2018, 10:12	1D Modelling of Mechanical Ventilation Network in OpenFOAM	#1
charles4allme Member Join Date: Feb 2018 Posts: 91 Rep Power: 8	Hello, I am running a fire simulation in a compartment and I would like to implement a ventilation model for the mechanical ventilation system.. I would like to use multiscale modelling method which means that I would represent the ventilation network with a 1D model. I am still a beginner with OpenFOAM and I would like to develop a 1D model for the ventilation network. Is that possible solely with OpenFOAM or woud I have to use another software to implement a 1D model and couple it with OpenFOAM.

May 16, 2018, 01:51		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	In general, OF works with 3d (unavoidable). There exist a b.c. to reduce the complexity to 2 or (rarely used) 1 dimensions: empty. You need to use only 1 element in the dimension(s) you wish to suppress. There are many examples for 2D, from which you may learn how to set an 1D geometry. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

May 16, 2018, 09:17		#4
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	> examples for the 2D. Are they the ones in OpenFOAM tutorials? Yes, I meant these. > only use 1 element in the dimensions I wish to suppress, am guessing you mean during setting up by mesh right? yes. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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May 16, 2018, 08:51		#3
charles4allme Member Join Date: Feb 2018 Posts: 91 Rep Power: 8	@piu58: Thanks for your reply. Where can I find the examples for the 2D. Are they the ones in OpenFOAM tutorials? Am guessing it will still be possible to set a boundary condition that I would be using in the 1D model. When you say i need to only use 1 element in the dimensions I wish to suppress, am guessing you mean during setting up by mesh right? Best regards

May 16, 2018, 11:25		#5
charles4allme Member Join Date: Feb 2018 Posts: 91 Rep Power: 8	Thanks a lot. Is it also possible to create a solver that can solve the 1D geometry in OpenFOAM using the governing equations but for one dimensional case. Thanks.