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Exploring a cut-cell representation of terrain in a microscale model

Lock, S and Coals, A and Gadian, A and Mobbs, S (2009) Exploring a cut-cell representation of terrain in a microscale model. In: Royal Meterorological Society Conference 2009, 29th June - 2nd July, 2009, University of Reading.

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Abstract

Moves to increasingly high-resolution models give rise to more variations in the underlying orography being captured by the model grid. Consequently, high-resolution models must overcome instabilities associated with terrain-following approaches. This work further explores the capabilities of a cut-cell representation of orography for idealised orographically-forced and moist microscale flows. The model is based on terrain-intersecting coordinates and solves flow in the resulting cut-cells using a finite-volume approximation. The model has been designed for the purposes of very high-resolution simulations. Comparisons with benchmark orographic and moist test cases demonstrate very good results. Further tests show the potential for the cut-cell approach for stably resolving flows over very steep orography.

Item Type:Conference or Workshop Item (Poster)
Uncontrolled Keywords:Numerical Weather Prediction; terrain-intersecting grid; orographic flow
Subjects:Atmospheric Sciences
ID Code:350
Deposited By:Dr S Lock
Deposited On:07 Sep 2009 09:50
Last Modified:07 Sep 2009 09:50

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