[Dicanic]

Hi all,



This is my first post and I am rather new to OpenFoam. I am trying to implement a polynomial expression for the density of a fluid. The expression looks like:



rho = A + BT + CT^2 + DT^-2


I looked at the hPolynomialThermo source code but am perhaps am missing something. A simple polynomial with positive exponents is easily implemented, but I can't seem to figure out how to do a negative exponent. Any suggestions?

[Marpole]

Hi George,


You might need to make a new equation of state as yours is not polynomial. To make, you can refer to this link by Armin How to add a new Equation of State

Originally Posted by Dicanic

Hi all,



This is my first post and I am rather new to OpenFoam. I am trying to implement a polynomial expression for the density of a fluid. The expression looks like:



rho = A + BT + CT^2 + DT^-2


I looked at the hPolynomialThermo source code but am perhaps am missing something. A simple polynomial with positive exponents is easily implemented, but I can't seem to figure out how to do a negative exponent. Any suggestions?