Piecewise function for properties

P1361 · July 16, 2014, 11:08

Hi everybody,

I want to use buoyantPimpleFoam solver in OF 2.22 for buoyancy driven flow of a fluid with temperature-dependent thermal/transport properties.

I have two questions now:

- for the equation of state, is it okay to use icoPolynomial? I believe, since the solver is pressure-based and my variations of density with pressure are negligible for my case, it should work. Any objection?

- my property functions (almost all of them) are kind of complex, so that a single polynomial (even of order 8-9) does not really yield satisfactory approximations. I want to use piecewise polynomial (or possibly another function) instead. Any suggestion of where to start?

Thank you very much in advance.

P

SamZar · May 14, 2019, 11:30

Hi,

I have noticed that this is an old thread. But I have the same issue: how can I define a piecewise function for propeties as a function of temperature in OpenFOAM?

Hope I can find my answer. Thanks.

July 16, 2014, 11:08	Piecewise function for properties	#1
P1361 New Member Join Date: Jul 2014 Posts: 13 Rep Power: 11	Hi everybody, I want to use buoyantPimpleFoam solver in OF 2.22 for buoyancy driven flow of a fluid with temperature-dependent thermal/transport properties. I have two questions now: - for the equation of state, is it okay to use icoPolynomial? I believe, since the solver is pressure-based and my variations of density with pressure are negligible for my case, it should work. Any objection? - my property functions (almost all of them) are kind of complex, so that a single polynomial (even of order 8-9) does not really yield satisfactory approximations. I want to use piecewise polynomial (or possibly another function) instead. Any suggestion of where to start? Thank you very much in advance. P

May 14, 2019, 11:30		#2
SamZar New Member Join Date: May 2019 Posts: 4 Rep Power: 6	Hi, I have noticed that this is an old thread. But I have the same issue: how can I define a piecewise function for propeties as a function of temperature in OpenFOAM? Hope I can find my answer. Thanks. fuad likes this.

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