Numericle simulation of the formation of linear dunes

Zhang Ruyan; Luo Chunmei

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Numericle simulation of the formation of linear dunes

Zhang Ruyan 1 *,Luo Chunmei 2

1.State Key Labroatory of Petroleum Resource and Prostectiong, Colege of Geophysics and Information Engineering, China University of Petorleum

2.College of Geophysics and Information Engineering, China University of Petorleum

*Correspondence author

#Submitted by

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Funding: 高等学校博士学科点专项科研基金资助课题（No.200804251021）

Opened online:22 October 2010

Accepted by: none

Citation: Zhang Ruyan,Luo Chunmei.Numericle simulation of the formation of linear dunes[OL]. [22 October 2010] http://en.paper.edu.cn/en_releasepaper/content/4387969

Three-dimensional flow above the sand dunes have been studied numerically by using Large-Eddy Simulation (LES) method. In the flow direction and span direction cyclic boundary conditions are imposed for velocity and pressure. The movement of the sand which is known as the elemental types of desert have been investigated. The numerical method employed in this study can be divided into three parts: (i) calculation of the air flow above the sand dunes using standard MAC method with a generalized coordinate system; (ii) estimation of the sand transfer caused by the flow through the friction; (iii) determination of the shape of the ground. Since the computational area has been changed due to step (iii), steps (i)-(iii) are repeated until prescribed times. The simulated dunes, which is formed by two directional winds, extends at the converging direction which is known as linear dunes.

Keywords:Computational Fluid Dynamics; Transverse Dunes; finite difference method; LES method

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