Hi,

1. Whats a good way to validate results from a commercial LES code? The code uses the finite volume method and velocity/pressure data is available at every cell-center. Using this, how may one look at the energy spectrum? How can one be assured of low aliasing error? How can one be assured that the filter width (=grid size) is sufficiently small? For an unstructured grid, what does one mean exactly by "grid size"?

2. When a company invests in a commercial CFD code, what numerical experiments does it usually perform to determine the validity of the computation (I am refering to LES modeling only)?

Many Thanks for your insights,

Good times!

Hi,

In the ressource section of CFD online

http://www.cfd-online.com/Resources/refs.html#data

there is a document called "AGARD Test Cases for the Validation of Large-Eddy Simulations of Turbulent FLows". This document presents a set of test-cases that could be used for validating LES. Ultimately, the vendor of the commercial LES code may be able to provide you with their validation cases.

Hoppe this help. Julien