Mohamed Abdulazim
Thank you very much for your insightful response, rwoolhou.I really need to upgrade Ansys program, but unfortunately this requires the installation of Windows 10 as I have Windows 8.1,I am going to work on that. You have mentioned that I should have a look at the flow field with focusing on circulation and shedding zones,do you need contours of flow field to understand the nature of the flow or advice me to refine mesh in these zones.