Tips for postprocessing multiphase flow

diamondx · March 2, 2015, 10:29

Hi all,
The titles says it all. I made some multiphase simulation in CFX, I would like to know if there are any better colormaps for post processing these results. to get a better visualization of the interphase between water and air. In 2D, I could reduce the number of colors in colormap. But still struggling in 3D (I know that technically, we lose information, but the case here is to show it to kids).

The links for the videos are here :

www.youtube.com/watch?v=IydT-t1k8Fg

www.youtube.com/watch?v=7h5dmmYxX_o

I am at work, I can't verify if these links works, they should.
Thanks to all

ghorrocks · March 2, 2015, 17:31

The 3D video can be done using volume rendering.

The 2D model can be done by changing the colour map so it has a big blue and red region. Alternately you can use a VF=0.5 contour line to define a user surface, then you can render that surface. This way you get a clearly shown transition from liquid to gas phases with no blurring (even though the simulation will have a bit of blurring of the surface).

JuPa · March 3, 2015, 05:55

Since we're on the subject of videos, is it possible to have a time stamp on the videos? I.e. if you simulate 2 seconds, can I play a slow-motion video with the time ticker in the corner going from 0 to 2 seconds?

Lance · March 3, 2015, 07:32

Quote:

Originally Posted by RicochetJ

Since we're on the subject of videos, is it possible to have a time stamp on the videos? I.e. if you simulate 2 seconds, can I play a slow-motion video with the time ticker in the corner going from 0 to 2 seconds?

insert text, 'embed auto annotation' and then 'type: time value'

diamondx · March 3, 2015, 10:16

Thank you everyone, I will try glenn's tips. I noticed I'm not receiving e-mail in hotmail for my subscribed threads. not even in the junk section. can someone shoot me a private message, to see if that will work ? thanks again

ghorrocks · March 3, 2015, 18:37

There is a known problem on the forum that hotmail does not accept emails from the forum. Jonas is looking into it but he did not sound too hopeful last time I talk to him on it. It also stops people from authenticating their account if they use a hotmail account. Very annoying. but not much we can do. It is a problem with the hotmail built in spam filter if I remember correctly.

March 2, 2015, 10:29	Tips for postprocessing multiphase flow	#1
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	Hi all, The titles says it all. I made some multiphase simulation in CFX, I would like to know if there are any better colormaps for post processing these results. to get a better visualization of the interphase between water and air. In 2D, I could reduce the number of colors in colormap. But still struggling in 3D (I know that technically, we lose information, but the case here is to show it to kids). The links for the videos are here : www.youtube.com/watch?v=IydT-t1k8Fg www.youtube.com/watch?v=7h5dmmYxX_o I am at work, I can't verify if these links works, they should. Thanks to all __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

March 3, 2015, 10:16		#5
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	Thank you everyone, I will try glenn's tips. I noticed I'm not receiving e-mail in hotmail for my subscribed threads. not even in the junk section. can someone shoot me a private message, to see if that will work ? thanks again __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

March 3, 2015, 18:37		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	There is a known problem on the forum that hotmail does not accept emails from the forum. Jonas is looking into it but he did not sound too hopeful last time I talk to him on it. It also stops people from authenticating their account if they use a hotmail account. Very annoying. but not much we can do. It is a problem with the hotmail built in spam filter if I remember correctly. diamondx likes this.

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March 2, 2015, 17:31		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	The 3D video can be done using volume rendering. The 2D model can be done by changing the colour map so it has a big blue and red region. Alternately you can use a VF=0.5 contour line to define a user surface, then you can render that surface. This way you get a clearly shown transition from liquid to gas phases with no blurring (even though the simulation will have a bit of blurring of the surface).

March 3, 2015, 05:55		#3
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 15	Since we're on the subject of videos, is it possible to have a time stamp on the videos? I.e. if you simulate 2 seconds, can I play a slow-motion video with the time ticker in the corner going from 0 to 2 seconds?