# Supercavitation problem

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 February 28, 2012, 08:47 Supercavitation problem #1 New Member   emil Join Date: Feb 2012 Posts: 3 Rep Power: 7 Hi! I'm working on a supercavitating hydrofoil. I made a simulation of the cavitating flow around the hydrofoil (2 phases, flow, turbulence, vapor equation). The “velocity inlet” is set to 25m/s, vaporization pressure to 1700Pa, density od water is 999kg/m3, density of water vapour 0,015 kg/m3, viscosity of water 0,00114 kg/ms, visc. of water-wapor 9e-10 kg/ms. My problem is that the Cl and Cd of the supercavitating hydrofoil are enormous (Cl=200000 and Cd=6000) they should be a little higher than the Cl and Cd found with just turbulence modelling (Cl=3.5 Cd=0.07). Any ideas? Thanks

 February 28, 2012, 17:51 #2 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 Have you checked the reference values?

 February 29, 2012, 13:32 #3 New Member   emil Join Date: Feb 2012 Posts: 3 Rep Power: 7 The reference values are the same for the 2 simulations. Area, velocity are set to 1 density to 1.225 kg/m3

 February 29, 2012, 18:26 #4 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 I'm not sure, but i think that area=chord length*hydrofoil depth, velocity has to be set 25m/s and density has to be set 999kg/m3. I' m looking forward for answers from other guys of the forum!!

 March 3, 2012, 22:21 #5 New Member   emil Join Date: Feb 2012 Posts: 3 Rep Power: 7 Yes of course! silly me!!! The „Cl“s of the SCHFoil and the one without cavitation are of the same order of magnitude if multiplied by the appropriate density. (999 kg/m3 for water and 0.015 for water vapor), thanks

 August 29, 2015, 11:39 supercavitation #6 New Member   Join Date: Aug 2015 Posts: 1 Rep Power: 0 Hi I want to simulate supercavitating flow around a hydrofoil for sigma=0.03 using CFX or Fluent. But the cavity isn't closed and continue until the outlet boundary

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