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esmaeili, M., Afshari, A. (2020). Large Eddy Simulation of the Flow Over non-confined Backward Facing Step Using High Order Compact Finite Difference Schemes. Electronic and Cyber Defense, 8(2), 125-139.
mostafa esmaeili; Asghar Afshari. "Large Eddy Simulation of the Flow Over non-confined Backward Facing Step Using High Order Compact Finite Difference Schemes". Electronic and Cyber Defense, 8, 2, 2020, 125-139.
esmaeili, M., Afshari, A. (2020). 'Large Eddy Simulation of the Flow Over non-confined Backward Facing Step Using High Order Compact Finite Difference Schemes', Electronic and Cyber Defense, 8(2), pp. 125-139.
esmaeili, M., Afshari, A. Large Eddy Simulation of the Flow Over non-confined Backward Facing Step Using High Order Compact Finite Difference Schemes. Electronic and Cyber Defense, 2020; 8(2): 125-139.

Large Eddy Simulation of the Flow Over non-confined Backward Facing Step Using High Order Compact Finite Difference Schemes

مکانیک سیالات و آیرودینامیک
Article 10, Volume 8, Issue 2 - Serial Number 24, June 2020, Pages 125-139    PDF (1.72 M)
Document Type: Original Article
Authors
mostafa esmaeili* 1; Asghar Afshari2
1Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran.
2School of Mechanical Engineering, College of Engineering, University of Tehran, Iran
Receive Date: 14 August 2019,  Revise Date: 04 May 2020,  Accept Date: 23 June 2020 
Abstract
In the present study, large eddy simulation of unsteady, three-dimensional and turbulent flow over non-confined backward facing step (BFS) is numerically conducted. Due to the capability of the compact differential scheme in high-order solution of the compressible flow, this method is used to solve the filtered Navier-Stokes equations in the generalized curvilinear coordinate using a multi-block structured grid. To study the influence of the sub-grid scale (SGS) stress model, the Smagorinsky model, the MKEV model, the dynamic Smagorinsky model (DSM), and the WALE model are considered. The numerical results include the general characteristics of the flow over BFS such as the reattachment length, friction and pressure coefficients, the mean velocity and the Reynolds stresses. Moreover, the present LES results are compared with the available experimental data and DNS, LES and RANS results and a very good agreement is achieved. Moreover, the obtained results using the DSM and WALE models give a better agreement with the DNS and experimental data than those by Smagorinsky and MKEV models.
Keywords
Large Eddy Simulation; Compact Finite Difference Method; High Order Scheme; Sub-Grid Scale Stress
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