Three dimensional boundary layer disturbance growth in natural convection adjacent to a uniformly heated vertical plate has been studied using a finite volume direct numerical simulation (DNS). The sequence of events associated with the intermediate stage of the spatial laminar-turbulent-transition for water, with Prandtl number Pr = 6.7, for the Rayleigh numbers in the range Rax ≈ 1 × 1010 – 4 × 1013, with perturbation parameters closely matching the experiment reported in , is investigated. Preliminary calculations confirm that this stage is characterized by the development of spatially periodic inner and outer span-wise vortices (shear layers), which travel in a differing fashion and speed; and a secondary mean flow system. The important route to natural convection flow breakdown, the arising of a double vortex mean longitudinal system, repeatedly suggested by past experiments, seems to be related to the complex and opposing behavior of these two layers.
- Heat Transfer Division
Numerical Study of 3D Nonlinear Disturbance Growth in Transitional Natural Convection
- Views Icon Views
- Share Icon Share
- Search Site
Aberra, T, Armfield, SW, Behnia, M, Maruyama, S, & Komiya, A. "Numerical Study of 3D Nonlinear Disturbance Growth in Transitional Natural Convection." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 7. Washington, DC, USA. August 8–13, 2010. pp. 173-181. ASME. https://doi.org/10.1115/IHTC14-23300
Download citation file: