Convergence cavitation simulation

anon_p · April 19, 2017, 04:24

Hey guys,

I have a general question about convergent behavior of a cavitation simulation. Which parameters do I usually use to confirm that my simulation is converged? Is it sufficient to consider the mass fraction of vapor?

I am using the compressible liquid flow solver and the inflow mass flow rate always shows some fluctuations which decrease but it needs quite some time, especially for the refined simulations. But I noticed that the shape of the cavitation areas inside the nozzle do not really change. Is that a normal behavior for nozzle simulations that use compressible flow solver?

Best regards

anon_p · April 24, 2017, 02:14

Is there no one with any experience about cavitation simulations?

anuarun · May 16, 2017, 10:32

Hi friend,
I use incompressible pressure based solver. I generally set all scaled residuals to 1E-6. Once the continuity and vapour void fraction reaches, the solution is OK (by this time, all other residuals would have reached convergence already , in most cases). What you said is right. The solution will not change much once these two residuals reach 1E-4 to 1E-5 after sufficient number of iterations(say 1000).
I don't have experience in compressible flow.

April 19, 2017, 04:24	Convergence cavitation simulation	#1
anon_p New Member Join Date: Oct 2016 Posts: 15 Rep Power: 10	Hey guys, I have a general question about convergent behavior of a cavitation simulation. Which parameters do I usually use to confirm that my simulation is converged? Is it sufficient to consider the mass fraction of vapor? I am using the compressible liquid flow solver and the inflow mass flow rate always shows some fluctuations which decrease but it needs quite some time, especially for the refined simulations. But I noticed that the shape of the cavitation areas inside the nozzle do not really change. Is that a normal behavior for nozzle simulations that use compressible flow solver? Best regards

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April 24, 2017, 02:14		#2
anon_p New Member Join Date: Oct 2016 Posts: 15 Rep Power: 10	Is there no one with any experience about cavitation simulations?

May 16, 2017, 10:32		#3
anuarun New Member Anuja Vijayan Join Date: Mar 2017 Location: Thiruvananthapuram Posts: 23 Rep Power: 9	Hi friend, I use incompressible pressure based solver. I generally set all scaled residuals to 1E-6. Once the continuity and vapour void fraction reaches, the solution is OK (by this time, all other residuals would have reached convergence already , in most cases). What you said is right. The solution will not change much once these two residuals reach 1E-4 to 1E-5 after sufficient number of iterations(say 1000). I don't have experience in compressible flow.