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How to set boundary of polymer swelling?

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Old   November 10, 2005, 05:46
Default How to set boundary of polymer swelling?
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I have the problem about polymer flow behavior in extruder.I use power law model for my simulation. Polymer melt is injected from die that appear swelling at exit. Now, I want to set free surface boundary at swelling surface. Can someone tell me how to set this boundary?
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