Time-step constraints for finite element analysis of two-dimensional transient heat diffusion

Authors: Cui, W., Gawecka, K.A., Taborda, D.M.G., Potts, D.M., Zdravković, L.

Journal: Computers and Geotechnics

Publication Date: 01/04/2019

Volume: 108

Pages: 1-6

eISSN: 1873-7633

ISSN: 0266-352X

DOI: 10.1016/j.compgeo.2018.12.012

Abstract:

In a FE analysis of transient heat transfer, a lower limit of the time-step size exists below which numerical oscillations of temperatures may occur. Although time-step constraints for simulating 1D heat diffusion have been well established in the literature, the conclusions cannot be directly applied to 2D cases. In this paper, both analytical and computational studies are carried out to obtain the time-step constraints for 2D linear and quadratic elements. It is noted that in the simulation of 2D heat diffusion employing quadratic elements is not always beneficial. Recommendations are provided on selecting the numerical scheme to minimise numerical oscillations.

Source: Scopus