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What is exactly timestep for our problem in radioss. How do we set timesteps for a simulation , on what basis do we decide them
Please, take a look at this ebook, as it goes through the aspects of a explicit analysis. Before starting any explicit analysis, you should have this very well understood to avoid misunderstandings.
https://altairuniversity.com/free-ebooks/free-ebook-crash-analysis-with-radioss-a-study-guide/
Very briefly, timestep is the step used to calculate your solution in an explicit approach.
The lowr the timestep the longer will take your simulation to run, as it needs more timesteps to conclude the same analysis time. The higher the timestep, the quicker your simulation will finish.
But, for explicit there's the concept of stability, and essentially you need to keep your timestep below the ideal timestep to make sure your solution will not add too much error along the simulation.
The timestep is a function of element size and material.
Take a look at this topic here in the community:
https://community.altair.com/community?id=community_question&sys_id=22c6c8ba1b2bd0908017dc61ec4bcb48
In HM, you can go to the 'Tools>>check elems' and check the minimum natural timestep for each element type.
Usually this is a reference value for you to define your timestep (nodal/elemental timestep).
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