Submitted on: 29 July 2014.
Revised on: 10 October 2014.
Accepted on: 17 November 2014.
___________________EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
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Submitted on: 11 July 2009.
Revised on: 15 August 2009.
Accepted on: 27 September 2009.
___________________EUROPEAN JOURNAL OF MECHANICS B-FLUIDS