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begin at line 94 of jumpCyclicFvPatchField.C

template<class Type>
Foam::tmp<Foam::Field<Type>>
Foam::jumpCyclicFvPatchField<Type>::patchNeighbourField() const
{
    const Field<Type>& iField = this->primitiveField();
    const labelUList& nbrFaceCells =
        this->cyclicPatch().neighbFvPatch().faceCells();

    tmp<Field<Type>> tpnf(new Field<Type>(this->size()));
    Field<Type>& pnf = tpnf.ref();

    Field<Type> jf(this->jump());
    if (!this->cyclicPatch().owner())
    {
        jf *= -1.0;
    }

    if (this->doTransform())
    {
        forAll(*this, facei)
        {
            pnf[facei] = transform
            (
                this->forwardT()[0], iField[nbrFaceCells[facei]]
            ) - jf[facei];
        }
    }
    else
    {
        forAll(*this, facei)
        {
            pnf[facei] = iField[nbrFaceCells[facei]] - jf[facei];
        }
    }

    return tpnf;
}

Mathematically, jumpCyclic BC must enforce the jump condition between patch faces. However, in the implementation, it seems that the jump condition are enforced between the inner cell and neighbour cells, which is obviously incorrect.