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Forum: Main CFD Forum

February 15, 2013, 06:13

Replies: 52

LES evaluation help needed

Views: 4,703

Posted By andy_

In which case you would seem to be confusing...

In which case you would seem to be confusing numerical resolution and modelling assumptions plus picking an inappropriate test case. To expand on my answer to your original question:

For an LES...

Forum: Main CFD Forum

February 15, 2013, 05:09

Replies: 52

LES evaluation help needed

Views: 4,703

Posted By andy_

The Reynolds number tells you this. There is no...

The Reynolds number tells you this. There is no need to perform a simulation. Your example is for a low Reynolds number flow and so a turbulence model that assumes the Reynolds number is high like a...

Forum: Main CFD Forum

February 14, 2013, 08:16

Replies: 52

LES evaluation help needed

Views: 4,703

Posted By andy_

The time varying motion at the Kolmogorov scales...

The time varying motion at the Kolmogorov scales is not resolved in an LES but modelled with a turbulence model. If you want negligible numerical errors then you must resolve the motion in time but...

Forum: Main CFD Forum

February 14, 2013, 07:02

Replies: 52

LES evaluation help needed

Views: 4,703

Posted By andy_

> 1) Simulation time is 261s, so the fluid...

> 1) Simulation time is 261s, so the fluid traveled nearly four times through
> the entire pipe, which is a bit too less, I guess. (?)

It depends on the type of flow. For example, accelerating...

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