multiphaseEulerFoam Co number explosion where no dispersed phase exist

geth03 · October 19, 2021, 04:29

hi all,

i am running a simulation with the reactingMultiphaseEulerFoam solver on OF version 7.

i have one continuous phase and multiple dispersed phases in one system. i don't know why but for the largest droplet phase the velocity rises to really high values, the strange thing is that the volume fraction for that phase is zero right there. the stranger thing is that the CO number right there rises quickly, too.

now, the question is: how does the Co-value increase when there is no dispersed phase with the high veloctiy?

geth03 · October 20, 2021, 09:51

i examined the code and found out that Co for multiphase cases is calculated for each phase independently and also for the total flux. so the max value is then taken as Co_max in the end, which means it doesnt matter if there is one particular phase or not.

October 19, 2021, 04:29	multiphaseEulerFoam Co number explosion where no dispersed phase exist	#1
geth03 Senior Member Join Date: Dec 2019 Location: Cologne, Germany Posts: 355 Rep Power: 8	hi all, i am running a simulation with the reactingMultiphaseEulerFoam solver on OF version 7. i have one continuous phase and multiple dispersed phases in one system. i don't know why but for the largest droplet phase the velocity rises to really high values, the strange thing is that the volume fraction for that phase is zero right there. the stranger thing is that the CO number right there rises quickly, too. now, the question is: how does the Co-value increase when there is no dispersed phase with the high veloctiy?

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October 20, 2021, 09:51		#2
geth03 Senior Member Join Date: Dec 2019 Location: Cologne, Germany Posts: 355 Rep Power: 8	i examined the code and found out that Co for multiphase cases is calculated for each phase independently and also for the total flux. so the max value is then taken as Co_max in the end, which means it doesnt matter if there is one particular phase or not.