Week 2 - Flow over a Cylinder.
SUMMARY:
| SIMULATION | REYNOLDS NUMBER | Cd | Cl |
| 1 | 10 | 3.3314425 | -0.00085925251 |
| 2 | 100 | 1.367848 | 0.17997243 |
| 3 | 1000 | 0.86912317 | -0.331299 |
| 4 | 10000 | 0.81047329 | 0.9461438 |
| 5 | 100000 | 0.74380507 | 0.43716453 |
From the above plot, we can say that the value of the lift coefficient keeps on increasing as we keep increasing the velocity and Reynolds number. The drag coefficient is maximum for the lowest Reynolds number and goes on decreasing.
CONCLUSION:
- When fluid flows over the cylinder, the wake region is formed next to the cylinder due to a decrease in pressure, and recirculation of flow occurs hence flow separation occurs.
- As flow over a cylinder is transient we are unable to observe flow separation at a low Reynolds number
- As the Reynolds number increases the coefficient of drag decreases.
- Strouhal number for an unsteady state with Reynolds number 100 is 0.01.
REFERENCE MATERIAL:
Numerical simulation of laminar flow past a circular cylinder - ScienceDirect
https://www.grc.nasa.gov/WWW/wind/valid/lamcyl/Study1_files/Study1.html
Paper Title (use style: paper title) (flowvisioncfd.com)
http://www.eng.fsu.edu/~shih/succeed/cylinder/cylinder.htm
https://en.wikipedia.org/wiki/Boundary_layer