Question about LES
When refine the grid. the LES result changes. That means the result is grid dependent. But why engineers' still working with that grid?
For explicit filtering LES, the grid refinemente reduces the local truncation error of scheme and the solution converges to a filtered solution, not to the DNS
Engineers (that practically use only implicit filtering LES) work with the grid the consider quite fine to resolve the energy containing structure for their problem.
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