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Which of these will not come under the types of filter functions used by the LES model?

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Which of these will not come under the types of filter functions used by the LES model?

(a) Top-hat filter

(b) Leonard filter

(c) Gaussian filter

(d) Spectral cut-off

I got this question in an internship interview.

The doubt is from Large Eddy Simulation for Turbulent Models topic in chapter Turbulence Modelling of Computational Fluid Dynamics

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Correct option is (b) Leonard filter

The explanation is: The LES method uses a filter function to spatially filter and get the larger eddies of interest. The most common three-dimensional filters are Top-hat filter, Gaussian filter and Spectral cut-off filters.

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