Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.1905.1911RazaviSeyed EsmailBararFarzadFarhangmehrVahid102008810In the current investigation, a Characteristics-Based (CB) finite-volume solution was developed to improve the convergence rate and the solution stability of the numerical simulation of incompressible viscous flows. The Artificial Compressibility Method (ACM) as a pre-conditioner was taken into account in our study. A fifth-order Runge-Kutta scheme has been used for marching in time. Local time stepping and implicit residual smoothing were applied as convergence acceleration techniques. The convective fluxes have been calculated by a Roe-like high-order flux splitting scheme. The viscous and thermal conduction terms were found by a second-order technique. This method admitted high Courant-Friedrichs-Levy (CFL) numbers and revealed a good convergence rate and accuracy within a wide range of Rayleigh numbers from 1 to 10000 for natural convection flow around a horizontal circular cylinder which is chosen as a case study. The obtained results were compared with available benchmark data in literature and showed a high consensus with them.]]>Drikakis, D., P.A. Govatsos and D.E. Papatonis,1994Drikakis, D. and P.K. Smolarkiewicz,2001Jameson, A.,1995Kuehn, T.H. and R.J. Goldstein,1980Kwak, D., C. Kiris and C.S. Kim,2005Mallinger, F. and D. Drikakis,2002Morgan, V.T.,1975Neofytou, P.,2007Roe, P.L.,1981Saitoh, T., T. Sajik and K. Maruhara,1993Shapiro, E. and D. Drikakis,2005Shapiro, E. and D. Drikakis,2006Volpe, G.,1993Wang, P., M. Kahawita and T. Naguyen,1990Zhao, Y. and B. Zhang,2000