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February 28, 2012, 07:47 |
Supercavitation problem
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#1 |
New Member
emil
Join Date: Feb 2012
Posts: 3
Rep Power: 14 |
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 |
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February 28, 2012, 16:51 |
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#2 |
Member
Join Date: Aug 2009
Posts: 67
Rep Power: 16 |
Have you checked the reference values?
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February 29, 2012, 12:32 |
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#3 |
New Member
emil
Join Date: Feb 2012
Posts: 3
Rep Power: 14 |
The reference values are the same for the 2 simulations.
Area, velocity are set to 1 density to 1.225 kg/m3 |
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February 29, 2012, 17:26 |
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#4 |
Member
Join Date: Aug 2009
Posts: 67
Rep Power: 16 |
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!! |
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March 3, 2012, 21:21 |
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#5 |
New Member
emil
Join Date: Feb 2012
Posts: 3
Rep Power: 14 |
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 |
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August 29, 2015, 11:39 |
supercavitation
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#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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