*Title*: **Conditioning of the Finite Volume Element Method for Diffusion Problems with General Simplicial Meshes**

*Abstract*: The conditioning of the linear finite volume element discretization for general
diffusion equations is studied on arbitrary simplicial meshes. The condition number is defined
as the ratio of the maximal singular value of the stiffness matrix to the minimal eigenvalue of
its symmetric part. This definition is motivated by the fact that the convergence rate of the
generalized minimal residual method for the corresponding linear systems is determined by
the ratio. An upper bound for the ratio is established by developing an upper bound for the
maximal singular value and a lower bound for the minimal eigenvalue of the symmetric part. It
is shown that the bound depends on three factors, the number of the elements in the mesh, the
mesh nonuniformity measured in the Euclidean metric, and the mesh nonuniformity measured
in the metric specified by the inverse diffusion matrix. It is also shown that the diagonal scaling
can effectively eliminates the effects from the mesh nonuniformity measured in the Euclidean
metric.

CAM Seminar Fall 2019