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Forum: OpenFOAM Running, Solving & CFD July 5, 2016, 02:54
Replies: 103
Views: 25,487
Posted By hannes
Dear Timofey, the DFSEM is a parallel...

Dear Timofey,

the DFSEM is a parallel development to our inflow generator. Although the basic idea is in principle the same, the differences are in the velocity distribution inside the spots (or...
Forum: OpenFOAM Running, Solving & CFD July 1, 2015, 03:18
Replies: 103
Views: 25,487
Posted By hannes
I see two problems: 1. Gnu Scientific...

I see two problems:

1. Gnu Scientific Library (gsl) is not installed. Please install the "-dev" package of your distribution.



2. You need to apply a patch to the OpenFOAM source to be able...
Forum: OpenFOAM Running, Solving & CFD June 14, 2015, 13:18
Replies: 103
Views: 25,487
Posted By hannes
Dear syavash, all required fields for the...

Dear syavash,

all required fields for the inflowGenerator-BC can be specified "uniform" or "nonuniform" in space but only steady in time. Unfortunately, there is no straightforward and comfortable...
Forum: OpenFOAM Running, Solving & CFD December 16, 2014, 01:36
Replies: 103
Views: 25,487
Posted By hannes
Dear amanbearpig, when you look at velocity...

Dear amanbearpig,

when you look at velocity magnitude after the first few timesteps it looks indeed like there are no fluctuations generated (first image). Although when you take a look at U_Z,...
Forum: OpenFOAM Running, Solving & CFD December 15, 2014, 08:47
Replies: 103
Views: 25,487
Posted By hannes
I'd like to be able to start it. Maybe via...

I'd like to be able to start it.
Maybe via dropbox? You can send me the link via a private message.
Forum: OpenFOAM Running, Solving & CFD December 15, 2014, 08:33
Replies: 103
Views: 25,487
Posted By hannes
Dear armanbearpig, can you share your case? ...

Dear armanbearpig,

can you share your case?

Regards, Hannes
Forum: OpenFOAM Running, Solving & CFD November 28, 2014, 07:58
Replies: 103
Views: 25,487
Posted By hannes
Dear openfoammaofnepo, the integral length...

Dear openfoammaofnepo,

the integral length scale you prescribed is 35% of the width of the inlet ring. It seems ok, perhaps a bit too high. I would generally expect something like one order of...
Forum: OpenFOAM Running, Solving & CFD July 8, 2014, 04:34
Replies: 103
Views: 25,487
Posted By hannes
Dear Tung, yes it is possible. Just...

Dear Tung,

yes it is possible.
Just prescribe an appropriate uniform distribution of the Reynolds Stresses and the length scales. The generated length scales are isotropic anyway.

Regards,...
Forum: OpenFOAM Running, Solving & CFD March 12, 2014, 02:23
Replies: 103
Views: 25,487
Posted By hannes
and regarding the selection of the length scale: ...

and regarding the selection of the length scale:

If the length scale becomes less than the cell size, the grid can no longer resolve the inner structure of the turbulence as well as that of the...
Forum: OpenFOAM Running, Solving & CFD March 12, 2014, 02:10
Replies: 103
Views: 25,487
Posted By hannes
The derivation of the velocity distribution is...

The derivation of the velocity distribution is explained in the following article by Kornev et al. (2007):
http://dx.doi.org/10.1063/1.2738607

It is obtained, if the spectrum for decaying...
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