Cavitation model

thanhctt · October 16, 2013, 13:19

How to simulate Cavitation model in Flow 3D? Can you help me?

JBurnham · October 17, 2013, 12:00

Do you need to model the actual bubbles forming and collapsing, or just find out where cavitation will occur? If you need to model the actual cavities (because they change the flow path around the cavitating object), then use the full cavitation model, and specify PCAV = cavitation pressure and CAVRT = characteristic cavity formation time = 0.001 second. The model will run very slowly. If you just want to know where cavitation will occur, either use the 'Cavitation Potential' model, or just look at pressure output around your objects of interest.

thanhctt · October 20, 2013, 04:48

I have the value of Cavitation potential in my simulation but I do not understand about this value.

JBurnham · October 21, 2013, 11:37

Cavitation Potential is a cell-by-cell value that is the time-integral of the magnitude of the difference between local cell-centered pressure and user-specified cavitation pressure. It is the sum of that difference for all time steps where the local pressure is less than the cavitation pressure. Because the units are pressure x time (dt), they are the same as dynamic viscosity.

October 16, 2013, 13:19	Cavitation model	#1
thanhctt New Member Nguyen Thanh Join Date: Oct 2013 Posts: 2 Rep Power: 0	How to simulate Cavitation model in Flow 3D? Can you help me?

October 20, 2013, 04:48	How about Cavitation potential value?	#3
thanhctt New Member Nguyen Thanh Join Date: Oct 2013 Posts: 2 Rep Power: 0	I have the value of Cavitation potential in my simulation but I do not understand about this value.

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October 17, 2013, 12:00		#2
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	Do you need to model the actual bubbles forming and collapsing, or just find out where cavitation will occur? If you need to model the actual cavities (because they change the flow path around the cavitating object), then use the full cavitation model, and specify PCAV = cavitation pressure and CAVRT = characteristic cavity formation time = 0.001 second. The model will run very slowly. If you just want to know where cavitation will occur, either use the 'Cavitation Potential' model, or just look at pressure output around your objects of interest.

October 21, 2013, 11:37		#4
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	Cavitation Potential is a cell-by-cell value that is the time-integral of the magnitude of the difference between local cell-centered pressure and user-specified cavitation pressure. It is the sum of that difference for all time steps where the local pressure is less than the cavitation pressure. Because the units are pressure x time (dt), they are the same as dynamic viscosity.