Scaling parameters for a time- averaged separation bubble

A. J. Smits

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


A splitter plate is placed in the wake of a two-dimensional bluff body. The splitter plate is long enough for the separated flow behind the body to reattach on the splitter plate. The time-averaged properties of this "closed" separation bubble are investigated under a wide range of kinematic conditions. It is found that blockage reduces the base pressure coefficient (Cpb) and the distance to reattachment (l) but the relationship between l and Cpb is not obvious. The pressure distribution in the separated zone, scaled on Cpb and l, can be described by a universal curve. The usefulness of a slotted wall in reducing blockage effects on bluff body flows is shown to be limited in that the wall porosity affects only some properties of the separation bubble.

Original languageEnglish (US)
Pages (from-to)178-184
Number of pages7
JournalJournal of Fluids Engineering, Transactions of the ASME
Issue number2
StatePublished - Jun 1982

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering


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