[idefix]

Hello,

hopefully I´ve got an easy question for you

I just want to calculate a absolut value of a gradient of a volScalarField (for example epsilon of the k-epsilon-turbulence model)

Could somebody help me with the name of the function?

Thanks a lot

[nimasam]

mag(fvc::grad(epsilon))

[idefix]

Thanks

but now I get an error because of the dimensions.
(--> FOAM FATAL ERROR:
LHS and RHS of - have different dimensions
dimensions : [0 -1 0 0 0 0 0] - [0 0 0 0 0 0 0] )


I want to calculate
( mag(fvc::grad(alpha1_)) - 1 ) / ( mag(fvc::grad(alpha1_)) - 1.1 )

alpha1_ is the phase volume fraction of the VOF-model

Has somebody an idea how I can do it?
I thought that this term has no dimension:
(metre - 1) / (metre -1 ) = 1

thanks again

[nimasam]

its some how obvious :P, grad means in simple word d/dx , when you gradient a dimless value! it gets a dimension -1 for meter so you can not add it with a constant number unless you use its value with value() function or give you constant a dimension