Abstract:
Two-dImensional finite volume method (FVM) based OilRe)llo1ds a\'erageu l'ia\'lcr-Stokcs
equa\lons (RANS) has been used to simulate incompressible flow ~round llydroloil in hoth
non-cavitating and cavitating conditions. The CAV2003 hydrofOlI SCClwn is used as test
case. A cavitation model based on bubble dynamic:; equationI' is lllclLLuedto lllvcstigaw the
un'le~dy behavior of cavitation at different cavitation l1umbero. DilTerenl turbulence
lTIodels such a, Spalart-Allmaras, Shear Stress Transport (SST) k-w and RenonllalizallOn
Group (RNG) k-s model wilh enhanced wall treatment arc uscG to capture boundary laydaround
hydrofoil surface and their effectivenes" are evaluated. It is observed tho! by k-f
lurbLllence model shows bettcr performance th~n any other model. For lhis reason. k- t'
model associated with mlllliphase model is used only in case of cavitaling 11<1\\. To
implement all of these, a conunercial CFD soll"are package, FLUENT 6.~.26 is used for
numerical solutions of the governi~g equations
The cavitaling study first presents an unsteady behavior of the parlla] ca vily and then super
cavity altached to the foil. The computed result in tenn5 of pre,sure coefficient. lift
coeflicient and drag coet1lcicnt at different cavitation nllmber, have been shown
graphically and in the tabular form. Tile contours of pressllTe distribution h~vc also been
displayed graphically. Finally, the flow pattern and hydrml)TIamic characteristics ~re also
srudiccl at different angles of attack. Satislactory agreement with tile published numencal
results is obtained in hoth cavilatmg and noncavitating conditiolls.
