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hi. i am running a simple problem in Radioss. first time, i applied a load of 5000 N, it is OK, i got the result about 3-4 minutes later. However when i increased the Load to 30000 N, it took very long time for running, the remaining time kept growing up like in the pictures. could  anyone explain why? Thanks

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Altair Forum User

Hi Toan,

When the time step drops, the run time will increase. The time step drop can be due to multiple reasons. It can be because of mesh size or penetrations in structure or high distortions in the structure. 

Check what is responsible for the low  time step (.out file). It can be an element, a node or an interface.

For an element, check the related material.There must not be an error in the units system that this data is given in. check the element size also

For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified.

For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface

 

Also, please watch the webinar on time step and time step controlling methods: http://www.altairuniversity.com/learning-library/considerations-about-time-step/