foam-extend4.1-coherent-io/applications/solvers/heatTransfer/buoyantSimpleFoam/initConvergenceCheck.H

    // initialize values for convergence checks

    scalar eqnResidual = 1, maxResidual = 0;
    scalar convergenceCriterion = 0;

    simple.readIfPresent("convergence", convergenceCriterion);