Phase change in DEM

how i can change the particle phase in dem i.e.from solid to liquid?

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Like trying to melt particles to form a slag?

Yes,how i can form slag?

seniors kindly guide me through,its been months i am unable to find answer

In order to simulate the slag, you might need to do Volume of fluid method (VOF), and combine the discrete Lagrangian method (particles) with VOF, that is another level.