Filter Definition and Properties
An LES filter can be applied to a spatial and temporal field and perform a spatial filtering operation, a temporal filtering operation, or both. The filtered field, denoted with a bar, is defined as:
where is the filter convolution kernel. This can also be written as:
The filter kernel has an associated cutoff length scale and cutoff time scale . Scales smaller than these are eliminated from . Using the above filter definition, any field may be split up into a filtered and sub-filtered (denoted with a prime) portion, as
It is important to note that the large eddy simulation filtering operation does not satisfy the properties of a Reynolds operator.
Read more about this topic: Large Eddy Simulation
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