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unit consistency in defining new variables comsol 4.3a
Posted 2 ott 2013, 19:27 GMT-4 Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Porous Media Flow, Materials Version 4.3, Version 4.3a 0 Replies
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I have a question related to variable definition in comsol. I know in newer version of comsol (4.3a) we should define consistent units for every variable. My problem is in the case of empirical relationships in which there is no dimensional consistency among all variables or constants. For example as you may know water density changes with temperature given by following equation:
ρ_w=1000×[1-7.37×〖10〗^(-6) (T-4)^2+3.79×〖10〗^(-8) (T-4)^3]
In above equation left hand side should have unit of kg/m^3 whereas in the right hand side we are dealing with some constants and powers of temperature. Should I define fake units for all constants and coefficients? What’s your recommendation for variables like this? Thank you in advance
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ALI
Hello Ali Moradi
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