Study of fluid flow around moving body and devices is an interesting subject. These areas consist study of various type of wind turbines (VAWT and HAWT), turbomachinery (pump, compressor, turbine, fan, and blowers), etc. by ANSYS Fluent software we are able to simulate behavior of fluid flow around and inside this device and find and improve performance of these devices. There is various module in ANSYS fluent to model and simulate the moving objects (moving reference frame, moving mesh, dynamic mesh, moving wall) and each module has itself limitation, advantage, and disadvantage and in most problem one special module able to simulate that work. for example we can model HAWT by both MRF and moving mesh. And we know that result of both modules is same and because we should use transient mode for moving mesh case, computational time will be higher than MRF and we prefer to model HAWT by MRF method. But in VAWT it is not possible to model it with MRF model because the wind turbine blade situation VS wind direction will change during time and we must simulate is with moving mesh.