Range of validity of weakly non-linear theory in Rayleigh-Bénard convection

Generalis, Sotos C. and Fujimura, Kaoru (2008). Range of validity of weakly non-linear theory in Rayleigh-Bénard convection. IN: Proceedings 5th European Thermal-Sciences Conference. Stoffels, G.G.M.; van der Meer, T.H. and van Steenhoven, A.A. (eds) Eindhoven (NL): Eindhoven University of Technology.


In this paper we examine the equilibrium states of periodic finite amplitude flow in a horizontal channel with differential heating between the two rigid boundaries. The solutions to the Navier-Stokes equations are obtained by means of a perturbation method for evaluating the Landau coefficients and through a Newton-Raphson iterative method that results from the Fourier expansion of the solutions that bifurcate above the linear stability threshold of infini- tesimal disturbances. The results obtained from these two different methods of evaluating the convective flow are compared in the neighbourhood of the critical Rayleigh number. We find that for small Prandtl numbers the discrepancy of the two methods is noticeable.

Divisions: Engineering & Applied Sciences > Mathematics
Engineering & Applied Sciences > Systems analytics research institute (SARI)
Additional Information: 5th European Thermal-Sciences Conference, 18-21 May 2008, Eindhoven (NL).
Uncontrolled Keywords: equilibrium states,periodic finite amplitude flow,horizontal channel,differential heating,rigid boundaries,Navier-Stokes equations,Landau coefficients,Newton-Raphson iterative method,Fourier expansion,Prandtl numbers
Full Text Link: http://www.euro ... ction/NCV_2.pdf
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Published Date: 2008-05
Authors: Generalis, Sotos C. ( 0000-0001-7660-0633)
Fujimura, Kaoru

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