I want to define a property which has more than 3 ranges of temperature. In fluent, for density if we choose piecewise polynomial then we can give maximum 3 ranges.

I want to use 5 ranges. then how could i input 2 more ranges. Can anyone help me with this?

udf can do

i can use UDF for other properties. but not for Specific heat(Cp). For Cp i have 5 piece wise polynomial. So, kindly let me know how to use 5 piece wise polynomial or UDF to define Cp property.

Thank you.

sorry, I have never used UDF for Cp. but, I tried something by creating User-Defined Database. There we can give UDF for Cp, but I don't have any idea about which UDF we can use. Follow the screen-shot, it may give some clue. http://home.iitk.ac.in/~sathees/ Good Luck

thanks, Do u think in similar way i can write a UDF for electrical conductivity, which is going to be part of source term in UDS for my vector potential equation.

How can i add entalpy udf. as there is no listing of enthalpy in properties list.

See the udf.h for the prototype. Also, the enthalpy is required in the UDF. Compute the integral of Cp from T_ref to T and assign that to *h. Heat of formation is added outside the call.

[thermal energy]

hi friends,

ı simulate melting problem inside annulor geometry. ı use paraffin (melting range 56-58oC) as a phase change material. first, ı have boussinesq approximation. and also my material properties depends on temperature like Cp (spesific heat) and k (thermal conductivity). my problem here is that,

if ı use piecewisepolynomial for k and Cp (solid value and liquid value), ı have a convergence problem (figure attached). but if ı use constant value for Cp and k, ı have no problem and it is still converging (iteration going on)

what's the reason of this. what's wrong. thanks for help