The Moving Deforming Mesh MDM Technique

Perng and Murthy [70] introduced the moving deforming mesh technique for simulating unsteady flows in mixing vessels. 

The model formulation used with moving meshes is of the arbitrary-Lagrangian-Eulerian (ALE) type. The integral form of the equations governing the incompressible Newtonian fluid in a time-varying control-volume V(t) is written as  

Note that this strategy may lose accuracy if the interface grid is allowed to deform excessively before regeneration. 

To validate the predicted results only one time dependent simulation has to be carried out to achieve time and impeller region average values for comparison with experimental data and the steady-state results obtained by the IBC, lO and snapshot methods. 

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