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BY 4.0 license Open Access Published by De Gruyter Open Access July 30, 2020

Expanding Grids for Efficient Cloud Dynamics Simulations Across Scales

  • David H. Marsico EMAIL logo and Samuel N. Stechmann


With large eddy simulations (LES) and/or cloud-resolving models (CRMs), it is now possible to simultaneously simulate shallow and deep convection. However, using traditional methods, the computational expense is typically very large, due to the small grid spacings needed to resolve shallow clouds. Here, the main purpose is to present a method that is computationally less expensive by a factor of roughly 10 to 50. Unlike traditional grid stretching of only the vertical z grid spacing, the present method involves expansion of the grid spacing in all coordinate directions (x,y,z) and time t. A ˝ne grid spacing of O(10)-O(100) m can be used near the surface to resolve boundary layer turbulence, and the grid spacing expands to be O(1000) m at higher altitudes, which reduces computational cost while still resolving deep convection. Example simulations are conducted with a simpli˝ed LES/CRM in 2D to verify the theoretical cost savings.

MSC 2010: 76R10


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Received: 2020-02-22
Accepted: 2020-06-24
Published Online: 2020-07-30

© 2020 David H. Marsico et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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