Klinger, L.Vos, J. B.Appert, K.2008-04-162008-04-162008-04-16200410.1016/j.compfluid.2003.07.005https://infoscience.epfl.ch/handle/20.500.14299/22075WOS:0001877389000084640A numerical method is proposed to evaluate gradients on non-uniform, non-orthogonal, three-dimensional structured meshes of hexahedra, as commonly used by finite volume methods. The method uses isoparametric transforms on tetrahedra to evaluate the gradient on a regular mesh and transform it back to the general mesh. It provides second-order accuracy, even,on highly non-orthogonal meshes. Results of stationary three-dimensional numerical simulations of a direct current plasma torch, making use of the proposed method, are presented. (C) 2003 Elsevier Ltd. All rights reserved.text::journal::journal article::research article