The visualization of flow field around circular cylinders by fluent standard k-ε turbulence model

An array of four circular cylinders was designed with different layouts (different value of H/Z), to study the flow field characteristics between cylinders, and the shading coefficient between circular cylinders also was explored. The Fluent standard k-epsilon turbulence model was employed in the flow field visualization and drag coefficient. In this paper, it is shown that the shading coefficient between circular cylinders decreases, with the value of H/Z increasing. The drag coefficient of the front circular cylinders presents symmetrical distribution. The drag coefficients are between 0.98 to 1.10. The drag coefficient of the back circular cylinders presents the same characteristic, the drag coefficients are between 0.38 to 0.47. The formation of vortex, vortex shedding, the separation of flow are formed between cylinders with value of H/Z increasing. When H/Z=8, the phenomenon of vortex shedding turns up, and the shading effect of the front cylinders is very weak.