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  1. rstates

    CFD

    I trained on FLUENT in '96 - pretty expensive then, more expensive now. You have to pay each year - no ownership option I am aware of. A better strategy is ADINA - has a nearly equivalent fluids environment, plus a full liquids and solids package, including fluid solid interaction. Their...
  2. rstates

    flow related vibrations

    Fans naturally surge at hi pressure dp - the fundamental is blade pass. The duct will organ piipe at its fundamental and harmonics. And a flexible duct will oil can. If any two of these are accidentally at the same frq, look out! Best thing is FFT the noise, and pick out the big offenders...

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