scholarly journals Development of a non-hydrostatic atmospheric model using the Chimera grid method for a steep terrain

2015 ◽  
Vol 17 (1) ◽  
pp. 109-114
Author(s):  
Kazushi Takemura ◽  
Keiichi Ishioka ◽  
Shoichi Shige
2016 ◽  
Vol 140 ◽  
pp. 19-38 ◽  
Author(s):  
Van-Tu Nguyen ◽  
Duc-Thanh Vu ◽  
Warn-Gyu Park ◽  
Chul-Min Jung

Author(s):  
Sijun Zhang ◽  
Jiwen Liu ◽  
Yensen Chen ◽  
Xiang Zhao
Keyword(s):  

Author(s):  
Xiaodong Hu ◽  
Zhonghua Lu ◽  
Jian Zhang ◽  
Xiazhen Liu ◽  
Wu Yuan ◽  
...  

The chimera grid methods have been widely used in the simulation of flow over complex configurations and unsteady moving boundary process. Lee and Baeder presented the implicit hole cutting (IHC) method, which improves the practicability and robustness of chimera grid method. But the excessive time consumption of this method restricts the scalability of parallelism. In this article, based on the parallel implementation of IHC method with structured multi-block grid, the factors which restrict the performance and efficiency are analyzed. Cartesian auxiliary grid is introduced to reduce the communication and computing cost. Finally, test cases are presented to demonstrate the effectiveness of this algorithm, and the calculation and data communication are reduced on the premise of maintaining accuracy.


2010 ◽  
Vol 138 (10) ◽  
pp. 3932-3945 ◽  
Author(s):  
Hiroe Yamazaki ◽  
Takehiko Satomura

Abstract A new method for representing topography on a Cartesian grid is applied to a two-dimensional nonhydrostatic atmospheric model to achieve highly precise simulations over steep terrain. The shaved cell method based on finite-volume discretization is used along with a cell-combining approach in which small cut cells are combined with neighboring cells either vertically or horizontally. A unique staggered arrangement of variables enables quite simple computations of momentum equations by avoiding the evaluation of surface pressure and reducing the computational cost of combining cells for the velocity variables. The method successfully reproduces flows over a wide range of slopes, including steep slopes where significant errors are observed in a model using conventional terrain-following coordinates. The advantage of horizontal cell combination on extremely steep slopes is also demonstrated.


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