UDF for dynamic meshing of 2D nozzle
 

Hi everybody, I am doing my PG project in CFD analysis of 2D convergent divergent nozzle for VTOL sea harrier. I have to generate dynamic mesh to simulate how flow varies from take off to landing. At take off half of nozzle remains perpandiculer to ground then it becomes horizontal. Can anybody suggest me how to create UDF for this problem.

Anant