# Cavitation model by A.K. Singhal

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 January 17, 2012, 04:42 Cavitation model by A.K. Singhal #1 New Member   neetu kumari Join Date: Mar 2011 Posts: 14 Rep Power: 13 Hello everyone To simulate the cavitating flow, FLUENT has used A K Singhal's full cavitation model. But the model equations for rate of evaporation or condensation has inconsistency in dimensions. The correct unit of rate of evaporation or condensation should be kg/m3.s, but according to the above mentioned model equations the unit of that particular rate is coming as kg/m4 (by assuming that the empirical constants are dimensionless). If empirical constants have unit then what its value in particular SI unit and if not then how this could be possible? If I have some misconceptions then please help me out. Thank you.

 January 17, 2012, 09:37 #2 Senior Member   shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 12 Can you share the paper which has the caviation model in it so that i can have a look at the dimension regards shk

January 18, 2012, 00:54
#3
New Member

neetu kumari
Join Date: Mar 2011
Posts: 14
Rep Power: 13
Quote:
 Originally Posted by shk12345 Can you share the paper which has the caviation model in it so that i can have a look at the dimension regards shk
Here is the full reference of that paper.

SINGHAL A.K., ATHAVALE M.M., HUIYING L., JIANG, L., 2002. Mathematical bases and validation of the full cavitation model. J Fluids Eng 124, 617-624.

Thanks

January 18, 2012, 03:22
#4
Senior Member

shoeb khan
Join Date: Nov 2011
Posts: 179
Rep Power: 12
Quote:
 Originally Posted by neetu kumari Here is the full reference of that paper. SINGHAL A.K., ATHAVALE M.M., HUIYING L., JIANG, L., 2002. Mathematical bases and validation of the full cavitation model. J Fluids Eng 124, 617-624. Thanks
Hi
i tried to asses the journal but it is blocked at my place . I f you have acces to that paper can you send me that paper .

Regards
shk

February 26, 2018, 06:21
#5
Member

Tingyun YIN
Join Date: Apr 2017
Posts: 31
Rep Power: 7
Quote:
 Originally Posted by neetu kumari Hello everyone To simulate the cavitating flow, FLUENT has used A K Singhal's full cavitation model. But the model equations for rate of evaporation or condensation has inconsistency in dimensions. The correct unit of rate of evaporation or condensation should be kg/m3.s, but according to the above mentioned model equations the unit of that particular rate is coming as kg/m4 (by assuming that the empirical constants are dimensionless). If empirical constants have unit then what its value in particular SI unit and if not then how this could be possible? If I have some misconceptions then please help me out. Thank you.
Hi, buddy. Now I have the same problem about the unit. How do you solve it? Any comments are appreciated.

 August 23, 2021, 04:19 #6 New Member   Christian Wolf Join Date: Mar 2009 Posts: 26 Rep Power: 15 Hello! (1) I also read A. K. Singhal paper and I came across the same question about the SI-units of Rc and Re. If Cc and Ce are dimensionless, Rc and Re have SI-unit of [kg/m⁴]. I am expecting SI-unit of [kg/(m³s)]. It is also written in the paper, that Rc and Re are 'phase change rates'. So, there should be Time (s) included in SI-unit of Rc and Re. (2) fg: Is there a model how to implement a transport equation for non-condensable gas (fg)? In my opinion, fg varies in fluid domain and depends on absolute pressure. I am posting this to ANSYS/Fluent Forum, as I am continuing this thread. But this is a comprehension question, independent of solver. I am glad to read your comments. Thanks for feedback. Last edited by jcw; August 24, 2021 at 02:03. Reason: completition

September 6, 2021, 04:33
Non-condensable gas transport equation
#7
New Member

Christian Wolf
Join Date: Mar 2009
Posts: 26
Rep Power: 15
Quote:
 Originally Posted by jcw Hello! (1) I also read A. K. Singhal paper and I came across the same question about the SI-units of Rc and Re. If Cc and Ce are dimensionless, Rc and Re have SI-unit of [kg/m⁴]. I am expecting SI-unit of [kg/(m³s)]. It is also written in the paper, that Rc and Re are 'phase change rates'. So, there should be Time (s) included in SI-unit of Rc and Re. (2) fg: Is there a model how to implement a transport equation for non-condensable gas (fg)? In my opinion, fg varies in fluid domain and depends on absolute pressure. I am posting this to ANSYS/Fluent Forum, as I am continuing this thread. But this is a comprehension question, independent of solver. I am glad to read your comments. Thanks for feedback.
Hello!

Finally, I found one paper (Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems, P. Casoli) which is dealing with the transport equations for non-condensable gas. I am struggeling with the definition of the mentioned equilibrium differential pressure, as used in eqn. 5. Can someone help?

Thanks and regards.