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. La-sphère-est, Ceci n'est vrai ni pour un cube, ni pour un ellipsoïde Il se pose alors la question de l'orientation des pores ayant l'une ou l'autre de ces formes. Lors du calcul du libre parcours moyen, l'orientation des pores n'est pas importante. En revanche, si les pores ont une orientation privilégiée, la conductivité thermique dépend de la direction du gradient. Le matériau est alors anisotrope si bien que la conductivité s'exprime sous la forme d'un tenseur. Ceci est mis en évidence par le graphe de droite de la figure F.1. Les pores cubiques sont implémentés de telle sorte qu'au moins un plan définissant une face du pore soit parallèle à un plan définissant les frontières de la structure : la section efficace vue par le flux dans la direction e z est un carré. Les pores ellipsoïdaux sont orientés de deux manières, deux configurations sont étudiées. Soit le demi-axe c est parallèle à l'axe e z de la structure, section efficace vue par le flux proportionnelle à a 2 , cas 1)a) (triangle vert pointant vers le haut) ; soit il y est perpendiculaire, section efficace vue par le flux proportionnelle à ac, cas 1)b) (triangle bleu pointant vers le bas