# buoyantPimpleFoam and incompressible fluid (temperature dependent properties)

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 September 18, 2015, 10:36 buoyantPimpleFoam and incompressible fluid (temperature dependent properties) #1 Senior Member   Agustín Villa Join Date: Apr 2013 Location: Fuenlabrada Posts: 308 Rep Power: 13 Hi I would like to know if someone of you have already tried to run an incompressible simulation with buoyantPimpleFoam for an incompressible fluid (now I am working with air, but later on I will use other kind of fluids). I have temperature dependence in all the variables, so my thermophysicalProperties looks like: Code: ```thermoType { type heRhoThermo; mixture pureMixture; transport polynomial; thermo hPolynomial; equationOfState icoPolynomial ; specie specie; energy sensibleEnthalpy; } specie { nMoles 1; molWeight 28.85; } equationOfState { rhoCoeffs<8> ( 4.0097 -0.016954 3.3057e-05 -3.0042e-08 1.0286e-11 0 0 0 ); } thermodynamics { Tlow 300; Thigh 500; Tcommon 300; Hf 0; Sf 0; CpCoeffs<8> ( 948.76 0.39171 -0.00095999 1.393e-06 -6.2029e-10 0 0 0 ); } transport { muCoeffs<8> ( 1.5061e-06 6.16e-08 -1.819e-11 0 0 0 0 0 ); kappaCoeffs<8> ( 0.0025219 8.506e-05 -1.312e-08 0 0 0 0 0 ); }``` It runs ok, but suddenly crashes: Code: ```--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function thermo::T(scalar f, scalar T0, scalar (thermo::*F)(const scalar) const, scalar (thermo::*dFdT)(const scalar) const, scalar (thermo::*limit)(const scalar) const) const in file /software/alternate/openfoam/fc20/2.3.1/OpenFOAM-2.3.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::species::thermo, 8>, Foam::sensibleEnthalpy>::THs(double, double, double) const at ??:? #3 Foam::heRhoThermo, 8>, Foam::sensibleEnthalpy>, 8> > >::calculate() at ??:? #4 Foam::heRhoThermo, 8>, Foam::sensibleEnthalpy>, 8> > >::correct() at ??:? #5 at ??:? #6 __libc_start_main at ??:? #7 at ??:? Aborted``` Do you know what could be happening? The temperature doesn't go to unlogical values, and I have polynomials expressions.

 September 22, 2015, 10:56 #2 Senior Member   Agustín Villa Join Date: Apr 2013 Location: Fuenlabrada Posts: 308 Rep Power: 13 Hi everyone, I am able to run it! I paid attention to some threads here (I will edit with their links), and it seems the problem was with the Code: `dpdt` I will update if there is something new. Ramzy1990 and Wilce94 like this.

 May 26, 2016, 17:33 Numerical difficulties with incompressible liquid and buoyantPimpleFoam #3 New Member   Vilma62 Join Date: Nov 2014 Posts: 9 Rep Power: 10 Hello agustinvo, I am trying to simulate buoyancy driven oil (incompressible liquid) flow and heating in the closed cavity by using buoyantPimpleFoam solver, and run into numerical difficulties (--> FOAM FATAL ERROR: Maximum number of iterations exceeded). Could you please elaborate in more detail how you succeed to stabilize buoyantPimpleFoam solver in your simulation (please note; I'm a total beginner)? Thank you in advance.

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