Post-process Isosurface Setting Anomalies

AeroJay · June 18, 2013, 08:52

Dear All,

I ran a multiphase simulation in a closed domain discretizing a tunnel. I wanted to display the free surface of the primary fluid which is water during the run therefore resorted to isosurface in the post process results. My only concern with the latter is the fact that:
* when i set the volume fraction of water to 0.5 as recommended i get patches of unfilled space in the domain.

* when i do decrease the water volume fraction i get a better result as the flow covering of the domain.

Your help is very much appreciated friends. If you could shed some light on the matter and kindly advise a better solution.

Thanks,

AeroJay

ghorrocks · June 19, 2013, 20:14

Can you post images of what you are seeing? Also post the CCL file.

AeroJay · June 20, 2013, 03:44

Dear Ghorrocks,

[I]Please find the comparative figures denoting the value of 0.05 and 0.5 for the post-processed displays. Also find the CCL file attached.

Thanks,

AeroJay

CCL.txt

Value 0.05.jpg

Value 0.5.jpg

daandb · September 5, 2013, 04:16

I have a similar problem with a sloshin study, there are gaps in iso-surface near the baffle plates. Hope someone knows a solution.

hmasenger · September 5, 2013, 06:17

is that some kind of chute or spillway?did you calculate the water table in the slop by open channel hydraulic equations? did you use a proper mesh grid on the slop which could express the water table ?it can be concluded by the pic you attached that there is no value for water volume fraction=0.5 and on the slop there is a very thin layer of water caused by high frude number.. i think a higher mesh quality would help.pleas let me know if it solves the problem i am working on some kind of similar model

ghorrocks · September 5, 2013, 09:13

I think Hamed is on the right track - a finer mesh will probably resolve this.

June 18, 2013, 08:52	Post-process Isosurface Setting Anomalies	#1
AeroJay New Member Manav Gunesh Join Date: May 2013 Posts: 5 Rep Power: 13	Dear All, I ran a multiphase simulation in a closed domain discretizing a tunnel. I wanted to display the free surface of the primary fluid which is water during the run therefore resorted to isosurface in the post process results. My only concern with the latter is the fact that: * when i set the volume fraction of water to 0.5 as recommended i get patches of unfilled space in the domain. * when i do decrease the water volume fraction i get a better result as the flow covering of the domain. Your help is very much appreciated friends. If you could shed some light on the matter and kindly advise a better solution. Thanks, AeroJay

June 20, 2013, 03:44	Isosurface details	#3
AeroJay New Member Manav Gunesh Join Date: May 2013 Posts: 5 Rep Power: 13	Dear Ghorrocks, [I]Please find the comparative figures denoting the value of 0.05 and 0.5 for the post-processed displays. Also find the CCL file attached. Thanks, AeroJay CCL.txt Value 0.05.jpg Value 0.5.jpg

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June 19, 2013, 20:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Can you post images of what you are seeing? Also post the CCL file.

September 5, 2013, 04:16		#4
daandb New Member Daan de Boer Join Date: Jun 2012 Posts: 6 Rep Power: 0	I have a similar problem with a sloshin study, there are gaps in iso-surface near the baffle plates. Hope someone knows a solution.

September 5, 2013, 06:17		#5
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	is that some kind of chute or spillway?did you calculate the water table in the slop by open channel hydraulic equations? did you use a proper mesh grid on the slop which could express the water table ?it can be concluded by the pic you attached that there is no value for water volume fraction=0.5 and on the slop there is a very thin layer of water caused by high frude number.. i think a higher mesh quality would help.pleas let me know if it solves the problem i am working on some kind of similar model

September 5, 2013, 09:13		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	I think Hamed is on the right track - a finer mesh will probably resolve this.