Eulerian wall film: missing mass

MrBennet · April 20, 2017, 10:25

Dear Colleagues,

I have a problem with modelling of ewf through dpm collection. When I do "sum" in "volume integrals" window the calculated total mass of film doesn't correspond to injection mass (subtracting droplets mass in flow). Anybody had the same problem and how did you solve it? I changed time steps, urf, dpm and ewf solution options but unsuccessfully.

Best regards,
Mr Bennet.

purushotam85 · June 7, 2017, 11:57

Hi there,

Were you able to solve the issue? I am experiencing similar problem of mass loss.

Thanks,
Puru

MrBennet · June 7, 2017, 12:39

Quote:

Originally Posted by purushotam85

Hi there,

Were you able to solve the issue? I am experiencing similar problem of mass loss.

Thanks,
Puru

Hi, Mr. Puru,

Select minimal thickness as small as possible and the discrepancy will be smaller.

Best regards,
Mr. Bennet.

Ahmed Alkaisi · June 8, 2017, 05:58

Hi
I have water evaporate need to be condense on the glass
Is it required to activate the Eulieran wall film please?
I can't intialize it says can't intialize Eulieran wall film!!!

Sent from my SM-G900I using CFD Online Forum mobile app

xjinxiang · October 27, 2019, 20:13

Hello MrBennet and Puru,

Have you solved this problem of mass inconsistency between injected mass and film mass? From version 18, there is no option to specify minimal film thickness. The film mass depends a lot on the maximum film thickness, while is independent of the mass rate.

Have you found a method to ensure the mass consistency between injection and deposited film in V18 or V19?

BTW, have you found a method to consider the liquid-wall interaction, which determines the maximal film thickness?

Regards,

Jinxiang

April 20, 2017, 10:25	Eulerian wall film: missing mass	#1
MrBennet New Member Alexey Join Date: Mar 2017 Posts: 3 Rep Power: 9	Dear Colleagues, I have a problem with modelling of ewf through dpm collection. When I do "sum" in "volume integrals" window the calculated total mass of film doesn't correspond to injection mass (subtracting droplets mass in flow). Anybody had the same problem and how did you solve it? I changed time steps, urf, dpm and ewf solution options but unsuccessfully. Best regards, Mr Bennet.

June 7, 2017, 11:57	Mass low in EWF model	#2
purushotam85 New Member pkumar Join Date: Jun 2010 Posts: 7 Rep Power: 15	Hi there, Were you able to solve the issue? I am experiencing similar problem of mass loss. Thanks, Puru

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June 8, 2017, 05:58		#4
Ahmed Alkaisi Member Ahmed Alkaisi Join Date: Aug 2015 Location: Australia Posts: 80 Rep Power: 10	Hi I have water evaporate need to be condense on the glass Is it required to activate the Eulieran wall film please? I can't intialize it says can't intialize Eulieran wall film!!! Sent from my SM-G900I using CFD Online Forum mobile app

October 27, 2019, 20:13		#5
xjinxiang New Member Jinxiang xi Join Date: May 2019 Posts: 1 Rep Power: 0	Hello MrBennet and Puru, Have you solved this problem of mass inconsistency between injected mass and film mass? From version 18, there is no option to specify minimal film thickness. The film mass depends a lot on the maximum film thickness, while is independent of the mass rate. Have you found a method to ensure the mass consistency between injection and deposited film in V18 or V19? BTW, have you found a method to consider the liquid-wall interaction, which determines the maximal film thickness? Regards, Jinxiang