New Thermal-Conductivity Constitutive Matrix in Fourier's Law for Heat Transfer Using the Cell Method

In this paper, a new constitutive matrix [M-tau] for thermal conduction, for tetrahedral meshes, in a steady state thermal regime is developed through a new algebraic methodology, using the Cell Method as a computational method, which is included in the finite formulation. The constitutive matrix defines the behavior of solids when they are under a thermal potential. The results are compared with those obtained for the same problem by means of the constitutive matrix [M-lambda] developed previously, taking in both cases with a 2D axisymmetric model as reference, calculated with the finite element method. The errors obtained with the new matrix [M-tau] are of the order of 0.0025%, much lower than those obtained with the matrix [M-lambda].