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Hello all, I am working on a model with an interface between RDX and a metal. With all Lagrangian it works correctly ! So I was expecting to get better results with RDX ALE and metal LAGRANGIAN, but I am getting negative volumes ERROR very quickly... I tried all the Interfaces Types for ALE/LAGRANGIAN but none of them is working correctly for my model. Did anyone know about this problem ? You can find attached the files of my simulation. Thank you in advance for your help ALE_0001.out ALE_0000.out ALE_0000.rad ALE_0001.rad deto_ALE.hm