Single Droplet BC

Martin_K_lalelu · May 26, 2014, 03:41

Hi,

I am currently trying to simulate a single water droplet in air.

How can I set up an internal symmetry BC? Is there another BC which sets the velocity perpendicular to the curved surface equal to zero?

nimasam · May 30, 2014, 01:09

which solver do you use?
if you use interFoam to simulate droplet fall, as much as i know Un1=Un2 at interface, which n1 and n2 is interface normal vector, so you did not to apply any BC

Martin_K_lalelu · May 30, 2014, 03:05

Hi,

thx for your reply!

I'm using the multiphaseInterFoam solver. My problem is unsteady with interphase transport of active scalars. For not getting to large and as a first attempt I tried to fix the droplet interface in space by setting all velocities perpendicular to the surface to zero to allow shear stress equality and movement within the droplet but having the droplet fixed and the surrounding gas streaming.

Recommendations would be really appreciated!

May 26, 2014, 03:41	Single Droplet BC	#1
Martin_K_lalelu New Member Martin K Join Date: Jan 2013 Location: Germany Posts: 28 Rep Power: 13	Hi, I am currently trying to simulate a single water droplet in air. How can I set up an internal symmetry BC? Is there another BC which sets the velocity perpendicular to the curved surface equal to zero?

May 30, 2014, 01:09		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	which solver do you use? if you use interFoam to simulate droplet fall, as much as i know Un1=Un2 at interface, which n1 and n2 is interface normal vector, so you did not to apply any BC __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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May 30, 2014, 03:05		#3
Martin_K_lalelu New Member Martin K Join Date: Jan 2013 Location: Germany Posts: 28 Rep Power: 13	Hi, thx for your reply! I'm using the multiphaseInterFoam solver. My problem is unsteady with interphase transport of active scalars. For not getting to large and as a first attempt I tried to fix the droplet interface in space by setting all velocities perpendicular to the surface to zero to allow shear stress equality and movement within the droplet but having the droplet fixed and the surrounding gas streaming. Recommendations would be really appreciated!