dimensional agreement

sinatahmooresi · April 30, 2016, 15:13

Hi foamers!
as i mentioned in above! my question is about dimensional agreement in compiling a solver.
i want to add a equation for calculation of density based on T and S ( temp and salinity) :
rho=(rho/998.2*(999.842594+6.793952e-2*T-(9.095290e-3*pow(T,2))+
(1.001685e-4*pow(T,3))-(1.120083e-6*pow(T,4))+(6.536336e-9*pow(T,5))+
*(8.24493e-1-4.0899e-3*T+(7.6438e-5*pow(T,2))-(8.2467e-7*pow(T,3))+
(5.3875e-9*pow(T,4)))+(pow(S,1.5))*(-5.72466e-3+1.0227e-4*T-1.6546e-6*pow(T,2))+S*(4.8314e-4)));

obviously, left and right side have no dimensional agreement somewheres

any would be appreciated

rapierrz · May 1, 2016, 02:06

Hi sina,

1.use volScalarField rho = instead of rho =

2.define a series of nondimensional parameters such as (T/T0)

that T0 is a dummy parameter with temperature dimension and

value equal to 1.

April 30, 2016, 15:13	dimensional agreement	#1
sinatahmooresi Senior Member CFD_Lovers Join Date: Mar 2015 Posts: 168 Rep Power: 11	Hi foamers! as i mentioned in above! my question is about dimensional agreement in compiling a solver. i want to add a equation for calculation of density based on T and S ( temp and salinity) : rho=(rho/998.2(999.842594+6.793952e-2T-(9.095290e-3pow(T,2))+ (1.001685e-4pow(T,3))-(1.120083e-6pow(T,4))+(6.536336e-9pow(T,5))+ (8.24493e-1-4.0899e-3T+(7.6438e-5pow(T,2))-(8.2467e-7pow(T,3))+ (5.3875e-9pow(T,4)))+(pow(S,1.5))(-5.72466e-3+1.0227e-4T-1.6546e-6pow(T,2))+S*(4.8314e-4))); obviously, left and right side have no dimensional agreement somewheres any would be appreciated

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May 1, 2016, 02:06		#2
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	Hi sina, 1.use volScalarField rho = instead of rho = 2.define a series of nondimensional parameters such as (T/T0) that T0 is a dummy parameter with temperature dimension and value equal to 1.