In this section
@article{Ham:2007:10.1016/j.ocemod.2006.05.008,
author = {Ham, DA and Kramer, SC and Stelling, GS and Pietrzak, J},
doi = {10.1016/j.ocemod.2006.05.008},
journal = {Ocean Modelling},
pages = {47--60},
title = {The symmetry and stability of unstructured mesh C-grid shallow water models under the influence of Coriolis},
url = {http://dx.doi.org/10.1016/j.ocemod.2006.05.008},
volume = {16},
year = {2007}
}
TY - JOUR
AB - The symmetry and stability properties of two unstructured C-grid discretisations of the shallow water equations are discussed. We establish that a scheme in which the circumcentres of the mesh triangles are used as the surface elevation points has advantageous symmetry properties and derive a Coriolis discretisation which preserves these properties. It is shown that the resulting scheme is conservative in a discretised energy norm. We then establish that schemes in which the water surface elevations are stored at the mesh triangle centroids do not share these advantageous symmetry properties. Finally we show examples which demonstrate that the centroid based scheme is subject to unstable growing modes, particularly in long timescale, Coriolis dominated problems; while the energy conservative circurricentre based scheme suffers from no such limitation. We conclude that unstructured C-grid methods using the triangle circumcentres and the conservative Coriolis scheme derived here therefore have advantages for this sort of problem over those schemes based on centroids. (c) 2006 Elsevier Ltd. All rights reserved.
AU - Ham,DA
AU - Kramer,SC
AU - Stelling,GS
AU - Pietrzak,J
DO - 10.1016/j.ocemod.2006.05.008
EP - 60
PY - 2007///
SN - 1463-5003
SP - 47
TI - The symmetry and stability of unstructured mesh C-grid shallow water models under the influence of Coriolis
T2 - Ocean Modelling
UR - http://dx.doi.org/10.1016/j.ocemod.2006.05.008
VL - 16
ER -