initial residuals for pressure of transcritical injection

bao_zhang · June 19, 2018, 09:43

Hi,everyone,
I an simulating transcritical nitrogen injection with PR equation of state by rhoPimpleFoam.The initial residuals for pressure is high (about 0.9)at each time step and don’t go down whenever Pimple or PISO loop is used.
At the same time,there are different results of simulation between Pimple or PISO loop.
Does someone have the similar questions and give me some advices?
Thanks

sibo · June 20, 2018, 20:13

Hi Bao,

Try to decrease the tolerance in fvSolution for pressure and other related variables in your case.
And you probably want to provide more information about this difference and make sure the results are both converged solutions.

June 19, 2018, 09:43	initial residuals for pressure of transcritical injection	#1
bao_zhang New Member Join Date: Jun 2018 Posts: 1 Rep Power: 0	Hi,everyone, I an simulating transcritical nitrogen injection with PR equation of state by rhoPimpleFoam.The initial residuals for pressure is high (about 0.9)at each time step and don’t go down whenever Pimple or PISO loop is used. At the same time,there are different results of simulation between Pimple or PISO loop. Does someone have the similar questions and give me some advices? Thanks

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June 20, 2018, 20:13		#2
sibo Member sibo Join Date: Oct 2016 Location: Chicago Posts: 55 Rep Power: 10	Hi Bao, Try to decrease the tolerance in fvSolution for pressure and other related variables in your case. And you probably want to provide more information about this difference and make sure the results are both converged solutions.