The Design – Critical Rayleigh Number for Rayleigh Benard Convection | ANSYS Fluent
Rayleigh-Bénard convection is a type of natural convection, occurring in a planar horizontal layer of fluid heated from below, in which the fluid develops a regular pattern of convection cells known as Bénard cells. Bénard–Rayleigh convection is one of the most commonly studied convection phenomena because of its analytical and experimental accessibility. The convection patterns are the most carefully examined example of self-organizing nonlinear systems.
Buoyancy, and hence gravity, are responsible for the appearance of convection cells. The initial movement is the upwelling of lesser-density fluid from the heated bottom layer. This upwelling spontaneously organizes into a regular pattern of cells.
In this analysis, it has been tried to simulate and analyze Critical Rayleigh Number for Rayleigh Benard Convection using Ansys Fluent software.
Geometry & Grid
The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 100000 mm³.
In this analysis, a steady-state analysis type was used to obtain the results to check the fluid flow.
The flow of top and bottom inlet design modeler geometry for this analysis is considered as specific heat is 4183 (j/kg-k). The inner wall is also considered a Stationary Wall.
Discretization of Equations
According to the type of flow, the SIMPLEC algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Second Order Upwind.
The results are presented as temperature as well as volume rendering.
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