ON A PHYSICALLY-REALIZABLE BENCHMARK PROBLEM IN INTERNAL NATURAL-CONVECTION

A new natural convection 'benchmark problem' for validating CFD codes is defined. In the subject problem, a cubical air-filled cavity, tilte d at 0, 45 degrees, or 90 degrees, has one pair of opposing faces at d ifferent temperatures, T-h and T-c, respectively, the remaining faces having a linear variation from T-c to T-h. In contrast to some other b enchmark problems, this problem is physically-realizable. Experimental techniques to establish the thermal boundary conditions and to measur e the Nusselt number to 1% accuracy are reported. Measured Nusselt num bers at Rayleigh number equal to 4 x 10(4) are shown to agree with CFD predictions to within +/- 0.3%. (C) 1998 Elsevier Science Ltd. All ri ghts reserved.