Journal Highlights

Understanding the behavior of modeling in the Terra Incognita regime from a practical view

Editor’s Highlight—

 

This paper addresses the practical problem associated with the operational use of nesting for coupling mesoscale and microscale flows with large eddy simulation (LES) modeling during the convection period when parent grids are in the terra incognita (TI) regime. In this situation, it is known that artificially induced cellular or horizontal roll vortices are introduced by PBL closure schemes employed in mesoscale modeling in relatively strong convection. This study provides insights into the properties of LES modeling outcomes using different values of TI parent to LES grid size ratios. This provides a sound and logical basis for the authors’ recommendation and guidance on optimal parent to LES grid nesting ratios when a parent grid is in the TI.