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-   -   falling droplet deforms unusually- Multiphase (http://www.cfd-online.com/Forums/fluent/110308-falling-droplet-deforms-unusually-multiphase.html)

MNHasan December 7, 2012 13:20

falling droplet deforms unusually- Multiphase
 
Hi,

I have been trying to simulated water droplet falling on a surface. I got some results. But the deformation while the droplet falls is unusual. I am giving links to three videos for three cases I considered

1. VOF+Level Set - with surface tension - with wall adhession (https://www.youtube.com/watch?v=P4VkHX9UYeE)
2. VOF+Level Set - with Surface Tension - no wall Adhession (https://www.youtube.com/watch?v=4UVQ-AM-vkY)
3. VOF (no Level Set) - without surface tension - no wall adhession (https://www.youtube.com/watch?v=rtVbNEHD6zE)

For the first two cases,

The BC's are: "top wall = pressure inlet" and "side walls = pressure outlet" and "bottom wall = wall".
Volume fraction parameter: implicit
Implicit Body Force Formulation: No
Pressure-Velocity Coupling: Coupled (with volume fraction)
Pressure: Body force weighted
Volume Fraction: QUICK
Level Set: QUICK

For the third case,

The BC's are: "top wall = pressure inlet" and "side walls = wall" and "bottom wall = wall".
Volume fraction parameter: Explicit
Implicit Body Force Formulation: Yes
Pressure-Velocity Coupling: Coupled
Pressure: PRESTO!
Volume Fraction: Geo-Reconstruct

Can anyone help me regarding regarding my queries? They are,

1. How can I assign initial velocity for the droplet?
2. How can I get more realistic deformation?
3. How can I apply wetted / non-wetted surface condition?
4. How do I implement dynamic contact angle?

Thank you very much

MNHasan December 10, 2012 16:54

Can anyone help me with answers?

otsigun July 10, 2013 04:25

Hello,

I am also working on similar Project on wetting Dynamics of a droplet. Can you send me your files, so that I can recommend something mehmet.yigit.balta@gmail.com


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