Volume 18, Issue 6 (10-2018)
Modares Mechanical Engineering 2018, 18(6): 1-11 |
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Rostamzadeh khosroshahi A, razavi S E, Mirsajedi S M. Multidimensional Characteristic Modeling of Combined Convection Flows. Modares Mechanical Engineering 2018; 18 (6) :1-11
URL: http://mme.modares.ac.ir/article-15-14363-en.html
URL: http://mme.modares.ac.ir/article-15-14363-en.html
1- Member of academic staff and head of energy conversion group/ Islamic azad university of tabriz
2- School of Mechanical Engineering, University of Tabriz, Tabriz, Iran.
3- Aerospace Engineering Department, Faculty of New Technologies & Engineering, Shahid Beheshti University, Tehran, Iran.
2- School of Mechanical Engineering, University of Tabriz, Tabriz, Iran.
3- Aerospace Engineering Department, Faculty of New Technologies & Engineering, Shahid Beheshti University, Tehran, Iran.
Abstract: (7317 Views)
Present study proposes a new multidimensional artificially characteristic-based (MACB) scheme for simulation of combined convection flows. Multidimensional characteristic structure for energy propagation in incompressible flow is derived for the first time. Four pseudo-waves are selected and equations are discretized along them to observe the physical behavior of domain. Viscous fluxes are computed by variables derivatives at the cell interfaces and for time discretization, a 4th-order Runge-Kutta method was used. According to the new scheme, two-dimensional flow with heat transfer in a square cavity and forced convection around a circular cylinder are solved for a wide range of Reynolds and Grashof numbers. Also, for comparison purposes, the CB scheme with averaging for energy equation is used. It was found that MACB has remarkable faster convergence in comparison with CB scheme and averaging methods. Also, by using MACB scheme, maximum permissible CFL number can be increased 80 percent in comparison to CB scheme. At higher Richardson numbers, the conventional flux averaging was failed to converge properly while MACB scheme presents the most rapid convergence. The computed results of MACB scheme are in good agreement with the benchmark solutions.
Keywords: Multidimensional characteristic, Artificial compressibility, Navier-Stokes equations, Combined Convection
Article Type: Research Article |
Subject:
Aerospace Structures
Received: 2017/11/6 | Accepted: 2018/08/15 | Published: 2018/09/24
Received: 2017/11/6 | Accepted: 2018/08/15 | Published: 2018/09/24
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