Hey all,
I'm trying to do a structural transient with ansys workbench 17.2 on a rather complex structure, but has always solved in max 15/20 minutes; now takes around 7 hours ..... why '!?!?!?!?
if someone need i can give more info to solve the problem, please ask me.
thanks 
Fapiro, It's very hard to provide a reason without any data or pictures.
Here is one suggestion...If it is the exact problem write out the Input deck for both cases and compare them. You can write out the input decks by using Tools>Write Input File in Mechanical.
Then use a text editor and use the difference to compare the 2 input decks? In notepad++ this be done using Plugins>Compare.
Regards,
Sandeep
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