CFD Online Discussion Forums - Degree/size of polynomials for thermo and transport (OF 2.2)

Hi all,

I would like to have a variable density for water the only combination that allows that to me is:

Code:



Valid rhoThermo types are:



type         mixture                    transport   thermo       equationOfState           specie  energy                   

...

heRhoThermo  pureMixture                polynomial  hPolynomial  icoPolynomial             specie  sensibleEnthalpy        

heRhoThermo  pureMixture                polynomial  hPolynomial  icoPolynomial             specie  sensibleInternalEnergy  

...

So I used the following combination:

Code:

thermoType

{

    type            heRhoThermo;

    mixture         pureMixture;

    transport       polynomial; 

    thermo          hPolynomial; 

    equationOfState icoPolynomial; 

    specie          specie;

    energy          sensibleEnthalpy;

}

That works fine if I define the polynomials like

Code:

CpCoeffs<8> ( 4200 0 0 0 0 0 0 0 ); //[J/kg/K]

But how would I define a different degree for a polynomial, e.g.

Code:

CpCoeffs<1> ( 4200 ); //[J/kg/K]

Since I do not need the accuracy, especially for cp and I think the poly evaluation eats up a lot of time.

Regards,
Markus.