[vatant]

I would like to compute the pressure difference between the local pressure value (say pd) and a reference value (dimensionedScalar pr) and need to check if its less than a tolerance?

How can i access the local pressure value ?

Can I do

dimensionedScalar diff = (pd-pref);

and some how get the magnitude of this scalar.

I would like to check

if ( diff < tolerance )
{
...
etc
}

How do i get the magnitude of difference of volScalarFields like pressure ?

Vatant

PS: Also, what is the function to get absolute value of the difference say ...absolute(pd-pr) ?