transint cavitation modeling

hmasenger · September 11, 2013, 00:02

hi all
there is one important question about initial condition in a transient cavitation modeling.
as mentioned in CFX manual , it is very important to set an accurate initial single phase condition (cavitation not activated) to solve a cavitating flow.but what if we need a transient modeling with adaptive time step ?in a transient model the CFX-Pre warns that it needs an initial condition which contains both fluids(water and water vapor) !
i see when a wrong initial condition have been set,it tunes to a wrong result(if i am not wrong in other parameter settings).
what should we do with this accurate initial condition in a transient run which contains both fluids ??
Thanks in advance

ghorrocks · September 11, 2013, 06:05

A single phase model should be OK to start. Just make sure you define a volume fraction initial condition of all liquid.

hmasenger · September 11, 2013, 07:37

thanks glenn i will try that.

September 11, 2013, 00:02	transint cavitation modeling	#1
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	hi all there is one important question about initial condition in a transient cavitation modeling. as mentioned in CFX manual , it is very important to set an accurate initial single phase condition (cavitation not activated) to solve a cavitating flow.but what if we need a transient modeling with adaptive time step ?in a transient model the CFX-Pre warns that it needs an initial condition which contains both fluids(water and water vapor) ! i see when a wrong initial condition have been set,it tunes to a wrong result(if i am not wrong in other parameter settings). what should we do with this accurate initial condition in a transient run which contains both fluids ?? Thanks in advance

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September 11, 2013, 06:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	A single phase model should be OK to start. Just make sure you define a volume fraction initial condition of all liquid.

September 11, 2013, 07:37		#3
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	thanks glenn i will try that.