Compression test - How to reduce simulation time (RADIOSS)
Altair EmployeeI'm working on compression test for a head model. My simulation times are close to 24 hrs. How can I reduce simulation time? I have attached the model file for reference.
Answers
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Hi Prajwal,
It is due to the time step drop the solution time keeps on increasing. Find what is causing for this time step drop.
Always check which object is responsible for the low time step in the listing file (Runname_nnnn.out) of RADIOSS Engine.
It can be an element, a node or an interface.
•For an element, check the related material (especially its Young modulus and density in case of an elastic-plastic material; and its viscosity in case of a visco-elastic material). There must not be an error in the units system that this data is given in. Check the size of the element, since elemental length is proportional to time step.
•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.
Once this is cleared you can run the simulation without time step being dropped.
Use /DT/NODA/CST for time step control and give Tmin value (Monitor the mass error in the engine out file).
Please refer the video below whcih shows timestep control in Radioss Explicit:
https://altair-2.wistia.com/medias/o0bfml9ah5
Please find the attached files.
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