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Forum: OpenFOAM Running, Solving & CFD

February 17, 2009, 05:15

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

Hi Fabian, I like the fact,

Hi Fabian,

I like the fact, that switching the model equations gives you well defined models for the LES and RANS part. Eventhough, the Smagorinski Sgs model is probably not the best choice. If...

Forum: OpenFOAM Running, Solving & CFD

January 13, 2009, 07:04

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

Daniel: yes I should have a h

Daniel:
yes I should have a hardcopy of the original DES97 paper. If I find a scanner I can send it to you (might take some time).

Fabian:
I am really not sure about your first point....

Forum: OpenFOAM Running, Solving & CFD

January 12, 2009, 10:37

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

I came across an upgraded vers

I came across an upgraded version of DDES called IDDES. If you are interested:

A hybrid RANS-LES approach with delayed-DES and wall-modelled LES capabilities
International Journal of Heat and...

Forum: OpenFOAM Running, Solving & CFD

January 12, 2009, 10:20

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

I am not sure what you mean by

I am not sure what you mean by "DES-law".

Using the cubeRootVolDelta makes it much more difficult to maintain RANS in attached flows and consequently, the switch from RANS to LES can occur well...

Forum: OpenFOAM Running, Solving & CFD

January 12, 2009, 09:30

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

Ok I get your point. I jus

Ok I get your point.

I just don't believe that the cubeRootVolDelta is an appropriate length scale for high aspect ratio hexahedral cells.
Also, the only way to ensure the correct behaviour...

Forum: OpenFOAM Running, Solving & CFD

January 12, 2009, 03:41

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

Hi Daniel Sorry I haven't h

Hi Daniel

Sorry I haven't had enough time to work on this issue.
But I still believe that a delta based on the maximum grid spacing is crucial for the old DES versions. Therefore, sooner or...

Forum: OpenFOAM Running, Solving & CFD

December 8, 2008, 04:11

Replies: 33

LESDES deltas

Views: 3,780

Posted By cfdmarkus

Hi all I had a look at the

Hi all

I had a look at the DES model currently implemented in OF1.5. For computing the DES length scale one needs a delta defined as delta()=C*max(dx,dy,dz). This definition is a crucial point...

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