CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Linear acoustics

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   March 9, 2012, 07:45
Default Linear acoustics
New Member
Join Date: Mar 2012
Posts: 8
Rep Power: 5
Fabian82 is on a distinguished road
I'am performing some validation tests of a compressible hydrodynamics code against solutions obtained from linear acoustics. How strong may sound waves be in terms of relative pressure fluctuations in order that the linear acoustic approximation is valid? At the moment, I need relative pressure fluctuations smaller than 1e-3 in order to have deviations from the analytical solution which are smaller than 1% (the simulations are converged in terms of grid resolution and the size of the time step). Can anyone confirm such a behaviour?

Thank you very much for your help.
Fabian82 is offline   Reply With Quote

Old   March 9, 2012, 12:47
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 1,863
Rep Power: 25
FMDenaro will become famous soon enoughFMDenaro will become famous soon enough
The classic theory states that the linearization is valid for |p'|/p0| <<1, |rho'|/|rho0|<<1 for omo-entropic flows with constant speed of sound a0.
In my opinion, practical applications require less than 1% ...
FMDenaro is online now   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
please help me which solver is better for my application Ger_US OpenFOAM 8 January 8, 2013 13:29
[LaunderGibsonRSTM-channel] tonkiplis OpenFOAM Running, Solving & CFD 1 November 9, 2011 09:04
solution diverges when linear upwind interpolation scheme is used subash OpenFOAM 0 May 29, 2010 01:23
IdeasUnvToFoam Bug amp Fix benru OpenFOAM Bugs 42 November 13, 2009 08:59
Water pump OpenFOAM 15 ANSYS CFX 110 comparation waynezw0618 OpenFOAM Running, Solving & CFD 39 March 5, 2009 13:57

All times are GMT -4. The time now is 13:18.