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Forum: OpenFOAM Running, Solving & CFD January 14, 2014, 11:38
Replies: 32
Views: 4,134
Posted By immortality
Hi dear Tobias, for an unsteady flow,are these...

Hi dear Tobias,
for an unsteady flow,are these schemes appropriate?is bounded scheme suitable for ddt(rho,gas)? the results seemed fine and now I noticed about maybe excess "bounded" term in...
Forum: OpenFOAM Running, Solving & CFD December 25, 2013, 10:46
Replies: 32
Views: 4,134
Posted By immortality
Hi dear Tobias this link has been broken,could...

Hi dear Tobias
this link has been broken,could you give me another link for referencing? thanks.
http://www.holzmann-cfd.de/index.php...rische-schemen
Forum: OpenFOAM Running, Solving & CFD May 26, 2013, 13:52
Replies: 32
Views: 4,134
Posted By immortality
Hi tobias I changed it: fvScalarMatrix gasEqn...

Hi tobias
I changed it:
fvScalarMatrix gasEqn
(
fvm::ddt(gas)
-fvm::Sp(phi, gas)
+fvm::div(phi, gas)
-fvm::Sp(fvc::div(phi), gas)
...
Forum: OpenFOAM Running, Solving & CFD May 26, 2013, 05:30
Replies: 32
Views: 4,134
Posted By immortality
Hi,sure it needs to be modified: fvScalarMatrix...

Hi,sure it needs to be modified:
fvScalarMatrix gasEqn
(
fvm::ddt(phi,gas)
-fvm::Sp(phi, gas)
+fvm::div(phi, gas)
-fvm::Sp(fvc::div(phi), gas)
...
Forum: OpenFOAM Running, Solving & CFD May 25, 2013, 16:16
Replies: 32
Views: 4,134
Posted By immortality
Hi again! and what will be the proper code for...

Hi again!
and what will be the proper code for an incompressible case? I wrote sp(rho,gas) in pimpleFoam and it got an error and when removed rho from equation in got another...
Forum: OpenFOAM Running, Solving & CFD May 23, 2013, 15:21
Replies: 32
Views: 4,134
Posted By immortality
thank you for your full clarification.:)

thank you for your full clarification.:)
Forum: OpenFOAM Running, Solving & CFD May 23, 2013, 14:45
Replies: 32
Views: 4,134
Posted By immortality
thanks. vanLeer isn't a second order scheme? ...

thanks.
vanLeer isn't a second order scheme?
what do 1 0 1 refer to respectively in the scheme?
Forum: OpenFOAM Running, Solving & CFD May 23, 2013, 08:18
Replies: 32
Views: 4,134
Posted By immortality
thanks Tobias related to vanLeer nothing has...

thanks Tobias
related to vanLeer nothing has said but it has nice results,then what do you suggest for better accurate and physical results for passive scalar transport?
Forum: OpenFOAM Running, Solving & CFD May 23, 2013, 06:57
Replies: 32
Views: 4,134
Posted By immortality
Hi again before close the issue dossier! when I...

Hi again before close the issue dossier!
when I used linear scheme for probably more accuracy it didn't get a good result(not good appearance and also higher than 1)
div(phi,gas) Gauss linear;
but...
Forum: OpenFOAM Running, Solving & CFD May 22, 2013, 14:15
Replies: 32
Views: 4,134
Posted By immortality
thank you for summary. and what I haven't...

thank you for summary.
and what I haven't understood yet is that when we have to use a bounded term in both steasy and unsteady,compressible and incompressible cases? some more clarification is good.
Forum: OpenFOAM Running, Solving & CFD May 22, 2013, 08:31
Replies: 32
Views: 4,134
Posted By immortality
since the problem is resolved now,I put this...

since the problem is resolved now,I put this answer by dear Tobias in private(by his permission:D),here so that someone needs now or in future knows more about what I asked:
Forum: OpenFOAM Running, Solving & CFD May 21, 2013, 17:45
Replies: 32
Views: 4,134
Posted By immortality
and also I forgot to ask about its residual.only...

and also I forgot to ask about its residual.only want to know does it has a specific reason or its ordinary and hasn't anything wrong.
the residuals of passive scalar are of order of .001 while...
Forum: OpenFOAM Running, Solving & CFD May 21, 2013, 17:32
Replies: 32
Views: 4,134
Posted By immortality
Thank you dear Tobias.Its exactly between 0 and 1...

Thank you dear Tobias.Its exactly between 0 and 1 now.:D
I didn't grasp what did that openfoam.org page say.
it says in line 8 that:
For transient solutions, it is usually better to implement only...
Forum: OpenFOAM Running, Solving & CFD May 21, 2013, 16:36
Replies: 32
Views: 4,134
Posted By immortality
thanks.I'm testing it now.but residuals of scalar...

thanks.I'm testing it now.but residuals of scalar still are higher than other equations. isn't it wrong?
and should I also add "bounded" in fvSchemes for all terms in 2.2.0 like ddt(rho, h) ...
Forum: OpenFOAM Running, Solving & CFD May 21, 2013, 14:35
Replies: 32
Views: 4,134
Posted By immortality
my case is treansient so rhoSimpleFoam may not be...

my case is treansient so rhoSimpleFoam may not be appropriate for my case.
I also have used rhoPimpleFoam with the same problem(not be scalar between 0 and 1)
that term is necessarily have to be...
Forum: OpenFOAM Running, Solving & CFD May 21, 2013, 14:17
Replies: 32
Views: 4,134
Posted By immortality
Hi Tobias could you please have a look into...

Hi Tobias
could you please have a look into rhoCentralFoamModified I have put in the above post?

tmp<fvScalarMatrix> gasEqn
(
fvm::ddt(rho,gas)
+ fvm::div(phi, gas)
...
Forum: OpenFOAM Running, Solving & CFD May 18, 2013, 13:02
Replies: 32
Views: 4,134
Posted By immortality
passive scalar increases

I have written a passive scalar equation that should be used in a compressible solver like rhoCentralFoam but in each test case i use that the passive scalar (gas) itself and also its residuals...
Showing results 1 to 17 of 17

 
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