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Hi all, A drop simulation was solved by radioss. The energy error was negative at initial, but it increased slowly and became positive. At time 19.97s, the energy error increased suddenly to 99.9%, and the energy increased several times. The .out file was attached below. Looking at .out file, the Interface 29 controlled the time step. In the model, the Interface 29 was self contact of foam material. /INTER/TYPE7/29 DiPao_SelfContact 156 157 0.01 000 /GRNOD/PART/156 GrnodPartForInterfaceId_29 86 /SURF/PART/EXT/157 SurfPartForInterfaceId_29 86 What's the possible reason for this energy error problem (I think the energy error should be negative and the absolute value should be less than 5%)? How to solve it? Test_0001.out Best Wishes Roy