Week 8- Moving zones approach in Fluent

#) Approaches for moving zones-

1) Circular kind of interface is used and the NS equation is solved separately as well. Data is transferred from one frame to the other through the interface .

The approaches are-

1) Area average- The physical quantity is found out by averaging over the whole area of the domain.

2) Mass average- The quantity is averaged over the mass of the system.

3) Mixed out approach - This is the best approach because the governing equations like the continuity equation . the momentum equation in the x y and z axis and the energy equation are solved. Since these equations are solved directly so it is the best and accurate method.

#) For unsteady phenomena we have to use the movig mesh approach-Phenomenas are-

1) Vortex Induced flows-

2) Interaction of vortex with bodies-

Moving mesh is used to model only unsteady phenomenas.

#) The steps are-

1) In the fluent mesh first the one part of the mesh is imported and then the other two parts are used to append the first part of the mesh.

The mesh created is as follows-

#) The 2d steady state planar symmetry is conducted.

#) The turbulence model is used as the k-epsilon model which is modified to the realizable k- epsilon model.

The cell zone condition is used and the three zones are fixed frame, rotating frame and the surface body are selected as the fluid condiion from solid.

#) In the boundary condition- The boundary conditions which were walls were made into the interface boundary condition type. Rotating domain inner and outer is chossen as the interface type. The rotational domain is selcted for the blades and rpm is given as the 2500 rpm.

The inlet condition is chossen as the pressure inlet type and the outlet condition is chossen as the pressure outlet condition.

#) Then the mesh interfaces are created and two mesh interfaces are one is domain interface and the rotating domain inner.

and the interface 2 is rotating domain outer and the frame 3 inner. 

Then the hybrid initialization is done and the solver setting is coupled flow .

The contours of the velocity and the pressure are made-