Direct interaction approximation
From AMS Glossary
direct interaction approximation
A turbulence closure scheme proposed by Kraichnan that eliminates the nonlocal direct interaction between large-scale and small-scale turbulence components.
Monin, A. S., and A. M. Yaglom 1975. Statistical Fluid Mechanics. MIT Press, . p. 409.
Kraichnan, R. H. 1959. The structure of isotropic turbulence in high Reynolds numbers. J. Fluid Mech.. 5. 497–542.