抄録
The steady laminar free convection flow around a uniformly heated circular cylinder which is placed horizontally in an infinitely extended incompressible fluid otherwise at rest is numerically investigated at high Grashof numbers. The Boussinesq approximation is assumed and the fluid flow with Pr=0.72 is calculated for Grd=8×105, 8×106 and 8×107 using Leonard's difference approximation scheme, where Pr is the Prandtl number and Grd the Grashof number based on the diameter of the circular cylinder and the temperature difference from the surrounding fluid. From the calculated result the flow separation bubble present at the upper stagnation point is observed to gradually extend as the Grashof number increases. Corresponding values of the Nusselt number are also evaluated and are found to be consistent with those given by existing empirical formulas.
