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PLZ NEED HELP !!! Failed to evaluate variables

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I followed the instruction of the absorptive muffler from the COMSOL website and tried to add one 1D plot for it. I tried to see the sound pressure level for the muffler once the length is changing in the 1D plot using global. But it gives me an error message said Failed to evaluate variables. Can anyone help me out and tell me how i did wrong? The file is too big so i cant upload it

Thank you so much!!!!!

0 Replies Last Post 10 giu 2014, 19:20 GMT-4
COMSOL Moderator

Hello Perry Moon

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