Piecewise function for properties

P1361 · July 16, 2014, 12:08

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, 12:30

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, 12:08	Piecewise function for properties	#1
P1361 New Member Join Date: Jul 2014 Posts: 13 Rep Power: 12	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, 12:30		#2
SamZar New Member Join Date: May 2019 Posts: 4 Rep Power: 7	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[blockMesh] Errors during blockMesh meshing	Madeleine P. Vincent	OpenFOAM Meshing & Mesh Conversion	51	May 30, 2016 11:51
[blockMesh] non-orthogonal faces and incorrect orientation?	nennbs	OpenFOAM Meshing & Mesh Conversion	7	April 17, 2013 06:42
[blockMesh] error message with modeling a cube with a hold at the center	hsingtzu	OpenFOAM Meshing & Mesh Conversion	2	March 14, 2012 10:56
latest OpenFOAM-1.6.x from git failed to compile	phsieh2005	OpenFOAM Bugs	25	February 9, 2010 05:37
Problem with compile the setParabolicInlet	ivanyao	OpenFOAM Running, Solving & CFD	6	September 5, 2008 21:50