Moving grids

The principle of moving grid method is to relocate grid points from a fixed number of nodes to nodes concentrating in the regions of rapid variation of velocity, pressure, etc. For its application in multiphase flow, this method track the interface by grid nodes on the interface and move interface grid nodes by Lagrangian transport.

                                               

  

  • Represent phase interface by grid nodes on the interface.  
     
  • Move interface grid nodes by Lagrangian transport:

    ⇒ It can result in large grid deformations which will make re-griding necessary.


     
  • Successful for small interface deformations.
     
  • Topology changes difficult
     
  • Difficult normal interface movement (phase change).