Harmonic Acoustic with Mean Flow

- December 22, 2019 at 5:36 pm
  
  Ömer Faruk Ünal
  Subscriber
  
  Hi everbody,
  
  I am working on the case about the effect of mean flow in Helmholtz Resonator. For this case, I am using an article and uploaded the article below. I validated the model no mean flow with using Acoustic Extension in Harmonic Response at version 18.1. Also validate at version 19.2 without Acoustic Extension. But I have a problem:
  
  My model doesn't work with mean flow. I applied mean flow inlet surface with the right direction. Transmission loss and resonance frequency don't shift at any mean flow value. I get the same Transmission Loss Graph. But expected that it must be increase resonance frequency and decrease transmission loss amplitude. I tried another muffler model in ANSYS Verify Manual with mean flow then it works.
  
  What would be the problems?
  
  The model details and results in the article are below :
  
  1) TL graph in the article
  
  2) TL result with Harmonic Response using Acoustic Extension
  
  3) Boundary Conditions and Geometric Model
  
  4) Model Tree
  
  Thank you for help