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January 29, 2010, 11:21 
sonicFoam #include[s] rhoEqn.H...

#1 
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...but the rhoEqn.H cannot be found in the solver directory (version 1.6). I was curious when I was using the solver before, it gave results for everything, but the rho was always calculated as 0. Does anybody know the purpose of this? Is this intentional? Can I incorporate some other rhoEqn.H easily?


February 15, 2010, 10:14 

#3 
Member

Revisiting this thread after some time:
I am running a case at the moment, using sonicFoam. The case is pretty much the same as /home/username/OpenFOAM/OpenFOAM1.6/tutorials/compressible/sonicFoam/ras/prism/ but instead of "prismWall", I have "wall" which is the wall of my domain. While running, in each time step, I get: Code:
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 My questions are:


April 26, 2010, 13:57 

#4 
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KGN
Join Date: Oct 2009
Location: Chennai, India
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Hi,
Any solution for this problem. 

October 30, 2013, 05:17 

#5 
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Richard Mathie
Join Date: Oct 2012
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Probably you need to supply an equation of state in your case dir? that is dont you need a thermoPhysicalProperties dict? I cant say for shure as I am looking at engineFoam and rhoPimpleFOAM at the moment, but that seems to be what's happening there. rhoEqn.h is just the mass conservation equation.


March 18, 2015, 12:58 

#6  
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Xinguang Wang
Join Date: Feb 2015
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Quote:
But still don't know how to get the rho values of the fields, two options: 1. state equation 2. phi=rho*velocity*A 

October 2, 2015, 10:18 
Solved?

#7 
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Lisandro Maders
Join Date: Feb 2013
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Do you guys solved this issue? Why is rho equation not being calculated?


October 5, 2015, 06:27 

#8  
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Xinguang Wang
Join Date: Feb 2015
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Hi Maders
Try to add these extra sentence at the end of controlDict, and the rho will output in the calculation folder. Quote:


October 5, 2015, 07:13 
Worked!

#9 
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Lisandro Maders
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October 5, 2015, 07:18 
Actually the answer is..

#10 
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Lisandro Maders
Join Date: Feb 2013
Posts: 71
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Actually the main answer iin this topic was about the rho calculation.. That seemed not to be doing by the "0" values of iterations and residuals. Here is the aswer, which is very logic by the way: http://www.cfdonline.com/Forums/ope...opisofoam.html
Regards, Lisandro 

June 8, 2016, 17:45 
Additional note

#11 
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Kristopher Pierson
Join Date: Jun 2016
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I would just like to add to this that by adding the rho function I was able to use the R utility to compute Reynolds stress when using the sonicFoam solver. This was very helpful if you are using some other turbulence model at the start of the solution with the intent to switch to LRR model after the flow field has been initialized.


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