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Forum: OpenFOAM Running, Solving & CFD

July 30, 2007, 08:47

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, as you mentioned, you c

hi,

as you mentioned, you can see it in sonicFoam.C.
in fvsolution you can find the name and parameters for the solvers of the linear equation system - in foam 1.3 sonicfoam uses versions of...

Forum: OpenFOAM Running, Solving & CFD

July 27, 2007, 08:58

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, in my opinion you can s

hi,

in my opinion you can see it only in the solver equations - correct me if i am wrong.
but still "backward" is not simply implicit euler - it has second order time errors since it uses more...

Forum: OpenFOAM Running, Solving & CFD

July 27, 2007, 05:59

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, if you look at the user

hi,

if you look at the user/programmers guide fvm:ddt with "euler" in the fvScheme should be the implicit one - fvc:ddt should be the explicit one.(both first order in time).
i dont know the...

Forum: OpenFOAM Running, Solving & CFD

July 26, 2007, 11:43

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, actually why do you thi

hi,

actually why do you think backward is more stable than implicit euler?
greetings
stephan

Forum: OpenFOAM Running, Solving & CFD

July 26, 2007, 10:08

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, i run the calculation w

hi,

i run the calculation with the settings i posted to you up to the endTime(10) and had no problems...
btw i used 4 piso loops but even if i use euler with 2 piso loops (standard) i have no...

Forum: OpenFOAM Running, Solving & CFD

July 26, 2007, 08:24

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, i checked me setup agai

hi,

i checked me setup again - and there are some changes to the tut-case:
i use backward instead of euler for the time in system/fvScheme and changed the tolerances to 1e-10 in...

Forum: OpenFOAM Running, Solving & CFD

July 26, 2007, 08:12

Replies: 13

Convergence in sonicFoamforwardStep

Views: 1,413

Posted By stephan

hi, i am not in expert in t

hi,

i am not in expert in this area -had only some lessons on gasdynamics - but what exactly happend?
if i run the case (foam 1.3) the max. co keeps constant and the mean co increases first...

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