# Noise reduction in automobile muffler(silencer) using CFD

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 January 9, 2010, 11:29 Noise reduction in automobile muffler(silencer) using CFD #1 New Member   aniket Join Date: Jan 2010 Posts: 2 Rep Power: 0 This is a B.E project.I'm using a resonator geometry(set of tubes with holes in them) for noise reduction.Is d analysis of such a geometry possible using CFD??? Also do the holes behave as wall only? Right now i know that only mass flow rate values can be given at inlet.What should be the inertia and viscous resistances values (if these can b d other parameters) at muffler inlet to obtain noise reduction after d muffler??

February 17, 2010, 12:54
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 Originally Posted by aniket This is a B.E project.I'm using a resonator geometry(set of tubes with holes in them) for noise reduction.Is d analysis of such a geometry possible using CFD??? Also do the holes behave as wall only? Right now i know that only mass flow rate values can be given at inlet.What should be the inertia and viscous resistances values (if these can b d other parameters) at muffler inlet to obtain noise reduction after d muffler??
hi...im tryin to do the same thing

 February 24, 2010, 19:00 #3 Senior Member   N/A Join Date: Mar 2009 Posts: 189 Rep Power: 9 You need to first decide on the time you have in hand and the computing power that you have. The holes you can model them as a cavity region. The more the complexity that you introduce, the uncertanities increases with them.

 February 24, 2010, 22:22 Regarding analysis of muffler using cfd. #4 New Member   Join Date: Feb 2010 Posts: 2 Rep Power: 0 Sir, Thank you so much for replying. We have got a geometry of a perforated pipe type of muffler that has been developed in CATIA V5 R17.. Can we import that file in GAMBIT and then create a mesh on it? If yes, then please guide us how? It is our final year B.E. project and we have time till March End.

 March 7, 2010, 03:34 Meshing perforated tube #5 New Member   aniket Join Date: Jan 2010 Posts: 2 Rep Power: 0 how do v mesh a perforated tube.there r 3 perforated tubes inside the muffler body n 1 of the tube is vertical .so how can v use Cooper scheme for meshing....if not then which scheme should v use.

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