CFD Online Discussion Forums - Accessing alpha.oldTime() in multiphaseMixture

Hello,

I am trying to access old time values of alpha in multiphaseMixture in multiphaseInterFoam but it does not seem to be accessible by the standard "oldTime()" convention. As a test, I have added the following in multiphaseMixture::solveAlphas in the base multiphaseInterFoam solver (no other modifications):

Code:

    forAllIter(PtrDictionary<phase>, phases_, iter)

    {

        phase& alpha = iter();



        //Added these two lines to see what's going on

        Info<< "Max delta(alpha"<<alpha.name()<<") = "

             << Foam::max(mag(alpha.field() - alpha.oldTime().field())) << endl;



        //the rest of the function is un-modified

This prints 0 every time, even when alpha is changing with time (running on the damBreak4phase example). Why is this not picking up the old time values, and how is MULES::explicitSolve then able to access those values? How should I be calling this to get the old time values??