transint cavitation modeling

hmasenger · September 11, 2013, 01:02

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, 07:05

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, 08:37

thanks glenn i will try that.

September 11, 2013, 01:02	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFX CEL Expression for Cavitation Modeling	kimotbwb	CFX	2	March 28, 2018 04:26
cavitation modeling and pressure distribution	arazgaldy	FLUENT	2	July 26, 2006 03:29
Modeling cavitation in ximed/shear layer?!	Helokey	FLUENT	0	April 11, 2004 22:50
Cavitation modeling using CFX/Tascflow	Bilal Bukhari	CFX	4	November 2, 2001 11:27
Level Set in Cavitation Modeling	Niklas Wikstrom	Main CFD Forum	1	September 9, 1999 14:08

September 11, 2013, 07:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	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, 08:37		#3
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	thanks glenn i will try that.