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Forum: OpenFOAM Running, Solving & CFD January 10, 2015, 09:56
Replies: 16
Views: 8,165
Posted By Quentin
rsubdeltaT is the field containing the inverse of...

rsubdeltaT is the field containing the inverse of local time step (you have rdeltaT which is the inverse of main local time step and r subdeltaT is rDeltaT times bnalphasubcycle).

Regarding Su and...
Forum: OpenFOAM Running, Solving & CFD January 10, 2015, 09:49
Replies: 16
Views: 8,165
Posted By Quentin
Hi James, I havn't work on this for a few...

Hi James,

I havn't work on this for a few month so I don't remember exactly but :

Su is the part of the source term not linked to [MATH]\alpha[MATH\] and Sp is the one linked to.
It allows...
Forum: OpenFOAM Running, Solving & CFD July 30, 2014, 05:12
Replies: 16
Views: 8,165
Posted By Quentin
Solved

Dear Dave, Laurent & foamers,

I managed to imlement this source term in LTSinterFoam solver.

1) the source I finally implemented is :
S = - \frac{\alpha}{n \, \Delta T} if 0 < \alpha < 0.5 ...
Forum: OpenFOAM Running, Solving & CFD July 16, 2014, 03:53
Replies: 16
Views: 8,165
Posted By Quentin
Adding source term to avoid numerical ventilation

Hi foamers, Dave,

With the knowledge of the name of the problem, i found his very intesting publication about resistance calculation for AC33 hulls...
Forum: OpenFOAM Running, Solving & CFD July 15, 2014, 05:03
Replies: 16
Views: 8,165
Posted By Quentin
Hi Laurent, yes I manage to do the trick,...

Hi Laurent,

yes I manage to do the trick, using the inletOutlet boundary condition as a start. I'll give you my code but i'm not very sure of what I've done and it's definitively not very clean,...
Forum: OpenFOAM Running, Solving & CFD July 15, 2014, 03:07
Replies: 16
Views: 8,165
Posted By Quentin
Hi Dave, thank you very much for your...

Hi Dave,

thank you very much for your answer. knowing the name of the issue will help me find documentation about it.

I had already tried to have less diffusive numerical scheme but it wasn't...
Forum: OpenFOAM Running, Solving & CFD July 4, 2014, 03:30
Replies: 16
Views: 8,165
Posted By Quentin
I think it would be much better to implement a...

I think it would be much better to implement a new boundary condition which would be something like


if (p < P0)
zeroGradient;
else
fixedValue 1;
end
I think I will do it today...
Forum: OpenFOAM Running, Solving & CFD July 3, 2014, 11:53
Replies: 16
Views: 8,165
Posted By Quentin
Here an illustration of you're pressure treshold...

Here an illustration of you're pressure treshold idea : the pressure and the interface on the cylinder with the blue/green jump at p = 250 Pa

32107

so it seems possible to implement your...
Forum: OpenFOAM Running, Solving & CFD July 3, 2014, 11:41
Replies: 16
Views: 8,165
Posted By Quentin
Hi Laurent, Try to run the same case with...

Hi Laurent,

Try to run the same case with these dictionnaries instead of the previous ones :

fvSolution

solvers
{
"alpha.water.*"
{
Forum: OpenFOAM Running, Solving & CFD July 3, 2014, 05:06
Replies: 16
Views: 8,165
Posted By Quentin
I found out that : calpha can't be set to 0...

I found out that :

calpha can't be set to 0 : the compression speed used to compressed the interface is calculate as |U_c| = min( calpha * |U|, max |U| ). so if calpha is set to 0, you remove the...
Forum: OpenFOAM Running, Solving & CFD July 2, 2014, 08:36
Replies: 16
Views: 8,165
Posted By Quentin
alpha1 wrong behaviour with LTSInterFoam [solved]

Hi Foamers,

I' m setting up (open FOAM v 2.3.0) a case for wave generation and drag calculation using LTSInterFoam. I conduct some basics verification and validation of my set up with a hull, for...
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