Buoyancy Reference

Zaktatir · September 9, 2011, 05:40

Hello,

I am wondering, which Reference Density shall i use when i have:

-Continuous Air
-Continuous Water Film
-dispersed Water Droplets.

My Problem is that the dispersed Phase (Water Droplets) flows through the water film and goes under, which is not physically true.

The Topic deals with Droplet separation from water/air free surface flow.

Jessica

evcelica · September 10, 2011, 19:37

From other multi-phase simulation tutorials (flow over hump), use the least dense material in the simulation as the reference density. Probably similar here.

Zaktatir · September 14, 2011, 05:58

yeah from a lot of tutorials, it is said to use the density of the lightest fluid, but in my case i have a dispersed water phase too. Okay i am using the density of air, but my problem consists in that when my droplets become big they fall down, which is physically true, but they travel under water film ( i am defining an reentrainment term but it seems to be an euler-euler approach problem)

September 9, 2011, 05:40	Buoyancy Reference	#1
Zaktatir Senior Member Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 17	Hello, I am wondering, which Reference Density shall i use when i have: -Continuous Air -Continuous Water Film -dispersed Water Droplets. My Problem is that the dispersed Phase (Water Droplets) flows through the water film and goes under, which is not physically true. The Topic deals with Droplet separation from water/air free surface flow. Jessica

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Second Derivative Zero - Boundary Condition	fu-ki-pa	OpenFOAM	11	March 27, 2021 04:28
Error with Wmake	skabilan	OpenFOAM Installation	3	July 28, 2009 00:35
OpenFOAM on MinGW crosscompiler hosted on Linux	allenzhao	OpenFOAM Installation	127	January 30, 2009 19:08
G95 + CGNS	Bruno	Main CFD Forum	1	January 30, 2007 00:34
Building OpenFoAm on SGI Altix 64bits	anne	OpenFOAM Installation	8	June 15, 2006 09:27

September 10, 2011, 19:37		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	From other multi-phase simulation tutorials (flow over hump), use the least dense material in the simulation as the reference density. Probably similar here.

September 14, 2011, 05:58		#3
Zaktatir Senior Member Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 17	yeah from a lot of tutorials, it is said to use the density of the lightest fluid, but in my case i have a dispersed water phase too. Okay i am using the density of air, but my problem consists in that when my droplets become big they fall down, which is physically true, but they travel under water film ( i am defining an reentrainment term but it seems to be an euler-euler approach problem)