A modified atmospheric non-hydrostatic model on low aspect ratio grids : part II
Sun, Oliver M. T.
MetadataShow full item record
Sun et al. (2012) proposed a modified non-hydrostatic model (MNH), in which the left-hand side of the continuity equation is multiplied by a parameter δ(4 ≤ δ≤16 in the article) to suppress high-frequency acoustic waves. They showed that the MNH allows a longer time step than the original non-hydrostatic model (NH). The MNH is also more accurate and efficient than the horizontal explicit and vertical implicit scheme (HEVI) when the aspect ratio (Δx/Δz) is small. In addition to multiplying a parameter δ, here we propose to add a smoothing on the right-hand side of the continuity equation in the MNH to damp shortest sound waves. Linear stability analysis and non-linear model simulations show that the MNH with smoothing (henceforth abbreviated as MNHS) can use twice the time interval of the MNH while maintaining the same accuracy. The MNHS is also more accurate and efficient than HEVI when the aspect ratio is small.
© The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Tellus A 65 (2013): 19681, doi:10.3402/tellusa.v65i0.19681.
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Sun, Wen-Yih; Sun, Oliver M. T.; Tsuboki, Kazuhisa (International Meteorological Institute, 2012-04-17)It is popular to use a horizontal explicit and a vertical implicit (HE-VI) scheme in the compressible nonhydrostatic (NH) model. However, when the aspect ratio becomes small, a small time-interval is required in HE-VI, ...
Acoustic scattering from sand dollars (Dendraster excentricus) : modeling as high aspect ratio oblate objects and comparison to experiment Dietzen, Gregory C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)Benthic shells can contribute greatly to the scattering variability of the ocean bottom, particularly at low grazing angles. Among the effects of shell aggregates are increased scattering strength and potential subcritical ...
Mating behavior, population growth, and the operational sex ratio : a periodic two‐sex model approach Jenouvrier, Stephanie; Caswell, Hal; Barbraud, Christophe; Weimerskirch, Henri (University of Chicago Press, 2010-04-21)We present a new approach to modeling two‐sex populations, using periodic, nonlinear two‐sex matrix models. The models project the population growth rate, the population structure, and any ratio of interest (e.g., operational ...