TIME STEP LESS OR EQUAL ZERO
Altair EmployeeAnswers
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Hi,
From the engine out file we can review what is causing very low time step.
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.
Moreover, please check the interfaces defined in the model for any penetrations.
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Altair Forum User said:
Hi,
From the engine out file we can review what is causing very low time step.
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.
Moreover, please check the interfaces defined in the model for any penetrations.
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Hi,
In the out file we can see that there are several penetrations. Please fix them using penetration fixing tool in HyperMesh and run the analysis.
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Altair Forum User said:
Hi,
In the out file we can see that there are several penetrations. Please fix them using penetration fixing tool in HyperMesh and run the analysis.
CAN U PLS HELP ME TO SOLVE IT AS I AM NEW HERE
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Hi,
I'm attaching a tutorial which shows fixing penetrations.Please go through the same, as it shows all the options for fixing penetrations.
Meanwhile, if you are using HyperWorks 2017 a new feature called Collision Detection Tool is available. It is also possible to fix penetrations using this tool.
Please go through the post below which shows the steps:
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THANKYOU
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