Reference solution ===================== Calculation method used for the reference solution -------------------------------------------------------- We have a simple analytical solution, since it involves exhibiting a harmonic function and adjusting the associated source in each domain: * in field 1: :math:`T(x,y,z)=T({A}_{1})+{x}^{2}+{y}^{2}+{z}^{2}`, (in the original frame :math:`{A}_{1}`), * in field 2: :math:`T(x,y,z)=T({A}_{2})+\frac{1}{2}{x}^{2}+{y}^{2}+{z}^{2}`, (in the original frame :math:`{A}_{2}`). From this we deduce the values of :math:`{s}_{1}` and :math:`{s}_{2}`,, :math:`{s}_{1}=-6.`, :math:`{s}_{2}=–\mathrm{5.W}/{m}^{3}`. Benchmark results ---------------------- Temperatures at the points on planes :math:`{B}_{1}{F}_{1}{G}_{1}{C}_{1}` and :math:`{A}_{2}{E}_{2}{H}_{2}{D}_{2}` Uncertainty about the solution --------------------------- Analytical solution.