RT Journal Article
T1 Gaussian RBF-FD weights and its corresponding local truncation errors
A1 Bayona Revilla, Víctor
A1 Moscoso, Miguel
A1 Kindelan Segura, Manuel
AB In this work we derive analytical expressions for the weights of Gaussian RBF-FD and Gaussian RBF-HFD formulas for some differential operators. These weights are used to derive analytical expressions for the leading order approximations to the local truncation error in powers of the inter-node distance h and the shape parameter є. We show that for each differential operator, there is a range of values of the shape parameter for which RBF-FD formulas and RBF-HFD formulas are significantly more accurate than the corresponding standard FD formulas. In fact, very often there is an optimal value of the shape parameter є+ for which the local error is zero to leading order. This value can be easily computed from the analytical expressions for the leading order approximations to the local error. Contrary to what is generally believed, this value is, to leading order, independent of the internodal distance and only dependent on the value of the function and its derivatives at the node.
PB Elsevier
SN 0955-7997
YR 2012
FD 2012-09
LK https://hdl.handle.net/10016/36343
UL https://hdl.handle.net/10016/36343
LA eng
NO This work has been supported by Spanish MICINN Grants FIS2010-18473, CSD2010-00011 and by Madrid Autonomous Region Grant S2009-1597. M.K. acknowledges Fundacion Caja Madrid for its financial support.
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RD 18 may. 2024