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SOL 159 - adaptive total no. of time steps

Hi,

 

I am simulating a solid cooling down from hot temperature using SOL159. 

 

Currently I specify the total number of time steps in the Nastran .dat file:

 

tstepnl,100,30

 

But the number of time step is not large enough for the whole part to cool down and I have to increase the total number of time steps to re-run again. Is there any way for Nastran to adaptively determine the total number of time steps (e.g. cool to a certain temperature) and stop accordingly (so that extra iterations wont be ran)?

 

Thanks!