# Thermophysical properties - multiple equations

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 April 22, 2020, 16:08 Thermophysical properties - multiple equations #1 New Member   Tobias Luiz Marchioro Toassi Join Date: Apr 2020 Posts: 1 Rep Power: 0 Hello foamers, I need to perform a convective-diffusive transient problem on the chtMultiRegionFoam, with air as fluid and concrete and carbon steel as solids. As a example, the specific heat of carbon steel is given by: from 20ºC to 600°C: Cp = 425 + 7.73e-01*T - 1.69e-03*T² + 2.22e-06*T³ from 600ºC to 735ºC: Cp = 666 + 13002/(738 - T) from 735ºC to 900ºC: Cp = 545 + 17820/(T - 731) from 900ºC to 1200ºC: Cp = 650 Cp is given in J/(kg*K). The other thermophysical properties of the carbon steel and concrete that I want to simulate are described on this master thesis, and I kindly encourage to see: http://hdl.handle.net/10198/19239, item nº. 4.1 (Is written in portuguese). How do I specify different equations to different temperature ranges in the thermophysicalProperties OpenFOAM file, as the example I give? Is that any other way to perform it? Thanks in advance. Last edited by tobias_toassi; April 22, 2020 at 18:34. Reason: Minor writing corrections.

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