Cylinder Example






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This simple geometry was chosen because it was used in the Fluent Acoustic module tutorial, and therefore it was very helpful for learning how to use the analysis correctly and investigating all the important factors, which influence the analysis. The mesh used can be seen below in figure 2. In figure 3 the detail of the mesh near to the cylinder surface is presented.




Cylinder Example


Car Geometry


Final Conclusion








Figure 2

Figure 3



After performing the LES simulation, from the plots of velocity magnitude, pressure, vorticity and velocity vectors, the relatively regular vortex shedding from the cylinder can be observed. The plots are available bellow in figures 3-7. Get the full-size plot by clicking at the image.




Figure 4 – Velocity Magnitude Contours

Figure 5 – Static Pressure Contours

Figure 6 – Vorticity Magnitude Contours

Figure 7 – Velocity Vectors







The results obtained from the simulation were very close to those presented in the tutorial, which used different meshing of the domain. The particular comparison of both solutions together with more details can be found in the Final Project Report in chapter IV.


Only for illustration a video sequence of Velocity Magnitude Contours was captured for number of time steps. This proved how the solution could be affected by backflows occurring at the pressure outlet boundary. It can be seen clearly, that as soon as the strong vortex hits the outlet boundary and causes backflows, all the solution is affected and the regular vortices shedding is damaged.



Click to download the video sequence