You have to buy the non commercial version of the ansys however, the limited version subscription is also too much costly for a solo researcher. Hence i would like to suggest you to use openfoam, its free and open source cfd code and most widely used for cfd analysis.
Hi Gerges, your provided link shows Ansys 19 student version, not 16.1. Actually i need Ansys APDL 16.1, as i could save the code and run just after pasting that code. in workbench i can't save code. Can you please suggest me anything in this case?