An alternative interpretation for the Holm "alpha model"
  By re-interpreting a recent successful closure procedure in terms of local spatial averaging and the neglect of fluctuations about that average, it is shown how the results of that closure scheme (the ''alpha model'') may be more simply derived. 
David C. Montgomery (1 and 2), Annick Pouquet (2) ((1) Department of   Physics and Astronomy, Dartmouth College (2) Advanced...