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Forum: OpenFOAM Pre-Processing

April 9, 2017, 14:12

Replies: 11

Which LES model and discretization schemes to choose?

Views: 4,004

Posted By piu58

To the one eqaution model: As far as I...

To the one eqaution model:

As far as I understand this model, a new value, the subgrid-scale kinetic energy, ist introduced. This you may imagine as the kinetic energy trapped in an eddy. The...

Forum: OpenFOAM Pre-Processing

April 9, 2017, 00:55

Replies: 11

Which LES model and discretization schemes to choose?

Views: 4,004

Posted By piu58

Some words to the LES models. The LES...

Some words to the LES models.

The LES simulates the vortices down to a size which depends on the mesh. What happens with these large eddies is not covert by the simulation in a direct way.

In...

Forum: OpenFOAM Pre-Processing

April 8, 2017, 15:25

Replies: 11

Which LES model and discretization schemes to choose?

Views: 4,004

Posted By piu58

All in all , we should use second order schemes,...

All in all , we should use second order schemes, so I discourage the use of upwind (without linear), because it is a first order scheme.

LinearUpwind is a combination of linear and upwind and...

Forum: OpenFOAM Pre-Processing

April 8, 2017, 09:29

Replies: 11

Which LES model and discretization schemes to choose?

Views: 4,004

Posted By piu58

Some words to the discredidation schemes: ...

Some words to the discredidation schemes:

CFD calculates the flow values (most important p and U), but not their derivatives. The derivatives must me calculated suing differences.

If you have...

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