Reference no: EM132368914

Assignment

Objectives:
To model and investigate using Computational Fluid Dynamics, the flow past circular cylinder.

Apparatus:
ANSYS Fluent /CFX will be used as currently available at UTS.

Problem:
The overall dimensions of the rectangular box will depend on the diameter of the circular cylinder.

Fig 1: Schematic of the computational domain

Fig 2: Name selection and boundary conditions.

The fluid flowing through the rectangular domain is air, with the following properties at 20°C:

Density, ρ = 1.2 kg/m³

Dynamic viscosity, μ = 1.81 x 10^-5 Pa.s

The boundary conditions for all the CFD models are:

Inlet velocity, U∞= 1 m/s; 3 m/s; 5 m/s

Outlet Pressure = atmospheric pressure

Velocity at walls = 0 m/s (no slip)

Flow = Turbulent using default settings.

Procedure and discussion points:

1. Create a geometry in DesignModeler/ Solidwroks/any CAD software

2. Build an appropriate mesh for the model. This will necessitate to run the simulations and make a grid refinement study presenting the results for different grids for U∞ = 5 m/s.

3. Using the converged grid, for U∞ = 3 m/s, check the iterative convergence.

4. Using the converged grid, run CFX/FLUENT for U∞ = 1 m/s, 3 m/s, and 5 m/s.

5. Chart the axial velocity profiles u(y) at the leading edge, at mid, at the trailing position of the FIRST cylinder and discuss your results.

6. Plot the velocity contours for U∞ = 1 m/s, 3 m/s, and 5 m/s and discuss the flow characterization.

7. Plot the velocity vector for U∞ = 1 m/s, 3 m/s, and 5 m/s and discuss

8. Plot the pressure contour for U∞ = 1 m/s, 3 m/s, and 5 m/s and discuss your results.

9. Calculate the drag and lift coefficient for U∞ = 1 m/s, 3 m/s, and 5 m/s and plot the results.

10. Verify your results with the existing literature.