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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX April 29, 2013, 19:02

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks First of all, is your model sufficiently accurate... First of all, is your model sufficiently accurate that you will get the structures you expect? You will need a low dissipation numerical scheme - use the LES settings with a central differencing...

Forum: CFX April 15, 2013, 19:08

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks If you intend to do DNS style simulations you... If you intend to do DNS style simulations you need to consider things like numerical dissipation and related issues. It is critical that the mesh defines the dissipation, not the numerics. You can...

Forum: CFX April 9, 2013, 19:01

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks I am not saying the journal is wrong - you... I am not saying the journal is wrong - you suggest it was saying you can estimate LES mesh size by when the viscous to turbulent dissipation ratio is one. This also sounds like a reasonable starting...

Forum: CFX April 8, 2013, 23:52

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks Energy is not created in the subgrid scale. In a... Energy is not created in the subgrid scale. In a turbulence model the turbulence just increases viscosity, so this is dissipative and cannot create energy -at least not in this universe, but if you...

Forum: CFX April 8, 2013, 18:21

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks The Kolmogorov length scale has little relevance... The Kolmogorov length scale has little relevance to a LES simulation. The Taylor length scale is a useful starting point for working out the mesh size required for LES:...

Forum: CFX September 2, 2011, 18:35

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks In my opinion (and it is only an opinion),... In my opinion (and it is only an opinion), showing the eddy viscosity ratio is low simply means that an LES model is likely to be easier than if it were high, as the length and time scales required...

Forum: CFX September 2, 2011, 06:39

Replies: 13 Eddy viscosity ratio and LES Views: 7,915 Posted By ghorrocks The sub grid model is not limited (in my... The sub grid model is not limited (in my knowledge anyway) to a ratio of 0.3. These low ratioes of dissipation simply mean the turbulence dissipation is small relative to the viscous dissipation. ...

Showing results 1 to 7 of 7

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