### Second-order conservative remapping between unstructured spherical meshes

**Evaggelos Kritsikis, ***(Laboratoire des Sciences du Climat et l'Environnement (LSCE))*

Tuesday 25 September 2012, 17:00-17:25

Seminar Room 1, Newton Institute

#### Abstract

Remapping from one finite-dimensional description of a function to another is a common problem in numerical modelling. In particular, information transit between meshes is required for, e.g., model coupling or mesh adaptation. In order to preserve the properties of a numerical scheme such as conservativity, accuracy, positivity, etc., the remapping algorithm must itself possess these properties. A second-order, conservative remapping between unstructured spherical meshes is presented. Areas are computed exactly by the defect formula and gradients estimated by the Gauss formula. Data is tree-structured, so that neighbour search is done in logarithmic time. In addition, the algorithm lends itself well to parallelisation. Numerical tests on various unstructured grids are given.

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