|May 8, 2011, 08:26||
writing an acoustic code based on FW-H equation, have a question regarding pressure
Join Date: Jul 2010
Posts: 49Rep Power: 6
I'm writing a code based on Ffowcs William- Hawkings (FW-h) equation. I just have one question.
As we know the formulation of Fw-h equation is like the first attached file.
The question is: As I know and read in some references the term P0 ( in the equation) is the pressure of the air(for example) at the rest or far field. But someone told me that it is the pressure of the mean flow, that means (P-P0) represents fluctuating pressure. For example suppose a fan that repeat its cycle and we get average of these cycles and calculate P0 and so calculate (P-P0) from this method. (see second attached file)
So, (P-P0) is equal to :
unsteady pressure - mean (steady) pressure?!
unsteady pressure - constant far-field pressure?!
Thank you for your help!,
|April 13, 2013, 07:01||
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 181Rep Power: 5
Have u made this model yet by anychance and how did your validation go,
i am very interested in your model
|February 13, 2014, 20:55||
Join Date: Jul 2011
Posts: 137Rep Power: 6
I'm interested too in this subject.
By the way P0 is the reference pressure and only in the condition of low Mach number (so low perturbation) you can consider that the P0 is equal to the mean pressure hence the acoustical pressure perturbation is equal to the perturbation relative to the turbulence.
|November 8, 2014, 21:12||
Join Date: Nov 2011
Posts: 14Rep Power: 5
Was any of you successful in implementing the FW-H analogy in OpenFoam ??
please i need help in it.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Issues on the simulation of high-speed compressible flow within turbomachinery||dowlee||OpenFOAM Running, Solving & CFD||5||June 15, 2015 03:38|
|Pressure based solver question||Tobiasrpr||Main CFD Forum||2||February 3, 2012 13:05|
|The correction on pressure equation of SIMPLE algorithm in MRFSimpleFOAM solver||renyun0511||OpenFOAM Running, Solving & CFD||0||November 10, 2010 02:47|
|correct UDF code for unsteady pressure boundary||James W||FLUENT||0||November 2, 2005 12:38|
|Hydrostatic pressure in 2-phase flow modeling (long)||DS & HB||Main CFD Forum||0||January 8, 2000 16:00|