The Design – Flow Over a Cylinder with Transition SST Model | ANSYS Fluent
The flow around a (geometrically) two-dimensional circular cylinder is a case that has been used both as a validation case and as a legitimate research case. At very low Reynolds numbers, the flow is steady and symmetrical. As the Reynolds number is increased, asymmetries and time-dependence develop, eventually resulting in the famous Von Karmann vortex street, and then on to turbulence. The problem geometry is two-dimensional and there is some variation in the details (both geometry and boundary conditions) that can be used.
The exterior boundaries are generally placed very far from the cylinder surface to avoid interaction between the boundary conditions. Grid generation is not especially difficult, though care must be taken to properly resolve the near-wall region as the Reynolds number is increased.
This problem has been solved as both laminar flow and turbulent flow. The DNS, LES, and transitional cases are still considered research cases. Many different numerical techniques have been used to solve this problem, but one usual comparison is the resulting Strouhal frequency (if the simulation is in the proper Reynolds number range.
Many variations in geometry are possible. One can impose symmetry by cutting the solution domain in half (along the x-direction). This will reduce the computational burden but will reduce the range of physical applicability of the simulations (asymmetries develop at rather moderate Reynolds numbers). Another variation is to impose periodic conditions in the y-direction – which gives us an array of cylinders rather than just one cylinder. There has also been work done simulating the response of spinning cylinders both in a free stream and near walls.
In this analysis, it has been tried to simulate and analyze flow over a cylinder with a transition SST Model 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 7,0536e+008 mm².
In this analysis, the transition SST Model turbulence viscosity model is used to check the fluid flow. The standard wall function is used near the wall.
The flow of primary input design modeler geometry for this analysis is considered as velocity magnitude and is 0.6 (m/s). The turbulence of the design modeler is set with an intensity equal to 0.5 (%). The turbulence of the design modeler is set with a length scale equal to 0.04 (m).
The flow output range is also considered as a pressure outlet for the flow output region and gauge pressure is equal to 0 (pascal). The inner wall is also considered a Stationary Wall.
Discretization of Equations
According to the type of flow, the SIMPLE algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Third-Order MUSCL.
The results are presented as velocity contours as well as streamlines.
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