YEqn.H

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if (Y.size())
{
    mvConvection = tmp<fv::convectionScheme<scalar>>
    (
        fv::convectionScheme<scalar>::New
        (
            mesh,
            fields,
            phi,
            mesh.schemes().div("div(phi,Yi_h)")
        )
    );
}

reaction.correct();

forAll(Y, i)
{
    if (composition.solve(i))
    {
        volScalarField& Yi = Y[i];

        fvScalarMatrix YiEqn
        (
            fvm::ddt(rho, Yi) + mvConvection->fvmDiv(phi, Yi)
          + thermophysicalTransport.divj(Yi)
         ==
            reaction.R(Yi)
          + fvModels.source(rho, Yi)
        );

        YiEqn.relax();

        fvConstraints.constrain(YiEqn);

        YiEqn.solve("Yi");

        fvConstraints.constrain(Yi);
    }
}

composition.normalise();