Eulerin wall film model problem about film thickness

ss890527 · September 5, 2016, 09:23

Description:
I would like to simulate the "film distribution" about spraying water droplets on a solid wall. I used "Discrete Particle Model" with solid cone and enable the wall film model. I also set the target wall "trapped" in the DP tab and initialize the eulerin wall with the minimum thickness to 0. The results show that "Eulerin wall film particles:absorbed = 1080, stripped = 0, separated = 0". It means that fluent did detect the particles. However the film thickness was all 0 along the target wall.

Question:
Can I use DPM and EWF to model the film thickness? Did I lost some important steps?
Should I use VOF model and EWF instead?

2phase · April 18, 2017, 11:29

Hi,

unfortunately I cannot give you an answer, but I am familiar with that problem...
I have two very similar simulations one with a film having no thickness and one film with a "plausible" thickness.

By now I cannot say what the difference in the settings might be. One case was set up by me, one by my student, but apparently the setting is identical - at least the setting for DPM and EWF, so where else could be the problem?

Anyone with any idea?

Cheers
Martin

September 5, 2016, 09:23	Eulerin wall film model problem about film thickness	#1
ss890527 New Member 曹騰躍 Join Date: Aug 2016 Posts: 2 Rep Power: 0	Description: I would like to simulate the "film distribution" about spraying water droplets on a solid wall. I used "Discrete Particle Model" with solid cone and enable the wall film model. I also set the target wall "trapped" in the DP tab and initialize the eulerin wall with the minimum thickness to 0. The results show that "Eulerin wall film particles:absorbed = 1080, stripped = 0, separated = 0". It means that fluent did detect the particles. However the film thickness was all 0 along the target wall. Question: Can I use DPM and EWF to model the film thickness? Did I lost some important steps? Should I use VOF model and EWF instead?

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April 18, 2017, 11:29		#2
2phase New Member Martin Join Date: Apr 2017 Location: Germany Posts: 26 Rep Power: 9	Hi, unfortunately I cannot give you an answer, but I am familiar with that problem... I have two very similar simulations one with a film having no thickness and one film with a "plausible" thickness. By now I cannot say what the difference in the settings might be. One case was set up by me, one by my student, but apparently the setting is identical - at least the setting for DPM and EWF, so where else could be the problem? Anyone with any idea? Cheers Martin