Subgrid PDF
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- | A subgrid [[probability density function]] <math> \bar{P}(\eta) </math> | + | A subgrid [[probability density function]] <math> \bar{P}(\eta) </math> , |
+ | also known as filtered density function (FDF), | ||
is the distribution function of scalar <math> Z </math> at subgrid scales. | is the distribution function of scalar <math> Z </math> at subgrid scales. | ||
Revision as of 12:25, 8 May 2006
A subgrid probability density function ,
also known as filtered density function (FDF),
is the distribution function of scalar
at subgrid scales.
The probability of observing values between
within the filter volume is
where is the Dirac delta function,
is a positive defined filter function
with filter width
.
The joint subgrid PDF of scalars is
where
is the phase space for the scalar variables