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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v4.i3.30
pages 211-221

MANIPULATION OF THE STARTING SEMICIRCULAR-CYLINDER NEAR-WAKE BY MEANS OF A SPLITTER PLATE

Nathalie Boisaubert
LE.A./LM.F. (U.M.R. CNRS n°6609), Bâtiment de Mécanique-40, avenue du Recteur Pineau-86022 Poitiers Cedex, Université de Poitiers - France
Madeleine Coutanceau
LE.A./LM.F. (U.M.R. CNRS n°6609), Bâtiment de Mécanique-40, avenue du Recteur Pineau-86022 Poitiers Cedex, Université de Poitiers - France
Alain Texier
LE.A./LM.F. (U.M.R. CNRS n°6609), Bâtiment de Mécanique-40, avenue du Recteur Pineau-86022 Poitiers Cedex, Université de Poitiers - France

RÉSUMÉ

As an example of flow controller, a short ID-long splitter plate is selected to manipulate the wake of an impulsively started flat-back semicircular cylinder (of diameter D) exhibiting fixed separation points. The way the plate-interaction develops with time and modifies the early vortex formation and shedding is analyzed with details by means of two complementary techniques of visualization (dispersed solid particles and dye filaments) when, positioned along the downstream center plane, the body-to-plate gap ranges from 0 to 1D and the Reynolds number is 600. Both topological observations like the possible occurrence and development of more or less important secondary separations and vortices, the shifting of the vortex shedding to the trailing edge of the plate and quantitative measurements characterizing the recirculating zone geometry and velocity magnitude are proposed and compared with the previous data by Boisaubert et al. [1] related to the plain body wake.


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