Particle Transport in Fluid Stream. How to keep them in the fluid!

kavanaa1 · August 9, 2012, 09:08

Hi All,

I am modelling the tranport of particles in a falling fluid stream. Having a problem as the particles are jumping out of the stream

(see attached screenshot1)

Are there any settings I can change to ensure the particles are retained within the fluid stream? (see screenshot 2 for current settings)

Appreciate your time.

Alan

dmilano · August 29, 2012, 16:26

On the Particles dialog make sure that the "Particles cannot escape to voids" option is checked. I think it is by default, so this looks more like a display quirk. The 3D view draws a surface of constant fluid fraction (0.5 by default). You may have particles in regions where the fluid fraction is less than 0.5, so the fluid surface is not drawn. On the Analyze->3D tab, try reducing the contour value - I suspect that this will display fluid around the particles.

sarasj · September 19, 2012, 00:13

hi all
I am simulating particles in an open channel (air and water) and I inject particles from bottom boundary, but particles move out from fluid (water) into air?
can you please help me to solve this problem?
thanks

September 19, 2012, 00:13	how to keep particles in fluid region in CFX?	#3
sarasj New Member sara Join Date: Sep 2012 Posts: 1 Rep Power: 0	hi all I am simulating particles in an open channel (air and water) and I inject particles from bottom boundary, but particles move out from fluid (water) into air? can you please help me to solve this problem? thanks

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August 29, 2012, 16:26		#2
dmilano Member Join Date: Mar 2012 Posts: 72 Rep Power: 14	On the Particles dialog make sure that the "Particles cannot escape to voids" option is checked. I think it is by default, so this looks more like a display quirk. The 3D view draws a surface of constant fluid fraction (0.5 by default). You may have particles in regions where the fluid fraction is less than 0.5, so the fluid surface is not drawn. On the Analyze->3D tab, try reducing the contour value - I suspect that this will display fluid around the particles.