# problems with baffles

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 October 26, 2013, 22:06 problems with baffles #1 Member   ouni firas Join Date: Oct 2013 Posts: 33 Rep Power: 4 Hi, i am a new user of flow3d . I have some problems ,so I ask your help,please i have a question about the remark found in the explanation of an example of FLOW-3D (1'' define'' baffles along bottom), the problem is that I do not have inderstand the role of BAFLLES, another issue is the word bcz in the file prepin I did not find their explanation and their role in addition I can not find it in the software interface. thank you for helping me afrontir these problems in the prepin file , the baffle definition appear as shown below: &bf nbafs=1, bcz(1)=1.0,

 October 27, 2013, 23:36 #2 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 9 bcz = baffle coordinate in z. It's the z-plane the baffle is defined in. This is easily determined from the User Manual. Look in the Input Variable Summary chapter. Ctrl-F = search, use it to find bcz in that chapter. Only define one baffle coordinate definition (x, y, or z); use limiters to cut the baffle down to size.

October 28, 2013, 06:52
#3
Member

ouni firas
Join Date: Oct 2013
Posts: 33
Rep Power: 4
Quote:
 Originally Posted by JBurnham bcz = baffle coordinate in z. It's the z-plane the baffle is defined in. This is easily determined from the User Manual. Look in the Input Variable Summary chapter. Ctrl-F = search, use it to find bcz in that chapter. Only define one baffle coordinate definition (x, y, or z); use limiters to cut the baffle down to size.

thank you for the explanation. can you explain the role of baffles.

 November 7, 2013, 18:18 #4 Member   Join Date: Mar 2012 Posts: 71 Rep Power: 6 Baffles are 2D surfaces used to represent thin objects without having to resolve the thickness. Also, they can serve as measurement devices, recording the flow of quantities through the baffle.

 November 8, 2013, 11:47 Evaluating hydraulic energy losses and total hydraulic head with FLOW-3D baffles #5 New Member   Amanda Ruggles Join Date: Sep 2013 Posts: 3 Rep Power: 5 A customer from Hydro-Quebec wrote an interesting article about using FLOW-3D baffles to evaluate hydraulic energy losses and total hydraulic head in a recent FLOW-3D newsletter. You can read it here: http://www.flow3d.com/resources/news...ulic-head.html

November 9, 2013, 09:00
#6
Member

ouni firas
Join Date: Oct 2013
Posts: 33
Rep Power: 4
Quote:
 Originally Posted by dmilano Baffles are 2D surfaces used to represent thin objects without having to resolve the thickness. Also, they can serve as measurement devices, recording the flow of quantities through the baffle.
thank you for the explanation.

 December 15, 2014, 01:34 #7 New Member   Yi-An Chen Join Date: Nov 2014 Posts: 3 Rep Power: 3 DEAR experts: I set a baffle,and defined it as a flux surface "yes". But when I save it ,"defined as a flux surface" will change to "NO" Ican't see the Value of the discharge Q (Volume flow rate) in the Analyze->Probe->General History data Help me, please!!

 December 15, 2014, 15:09 #8 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 9 Make sure you have only one (1) definition set. You can use Limiters to then further alter the shape. If you have only one Definition then you're using a version with a bug in it. If it's a legit version, contact Flow Science about it. If it's not a legit version try building the prepin file manually in a text editor or consider getting a real paid version.

July 15, 2016, 07:52
#9
New Member

hanif pourshahbaz
Join Date: Jun 2016
Posts: 15
Rep Power: 2
Dear experts

i some questions and i will so grateful to any kind of answers and opinions
i used baffles to create a spur dike (groin) in channel in order to thin thickness vs channel length or width
channel is ( 174cm* 60cm* 40cm)
spur dikes are ( 30cm* 40cm* 4mm)
so i used baffles to create dikes with porosity of 0, but there are some questions,
should i turned off the define as flux surface because i read in help that:
((A flux surface is typically a 100% porous baffle with no flow losses so it does not affect the flow in any way. However, a flux surface can also be defined using a baffle that has a porosity greater than 0.0 and less than or equal to 1.0))
i want to create a solid object by baffle with a thin thickness

the second question is why i see difference object in analyses?? for example the blue one in pictures??

i attached pictures of my problems to illustrate them

Regards
Hanif
Attached Images
 Untitled.jpg (95.1 KB, 10 views) 1.jpg (96.7 KB, 10 views) 2.jpg (85.0 KB, 7 views)

 July 15, 2016, 17:19 #10 New Member   hanif pourshahbaz Join Date: Jun 2016 Posts: 15 Rep Power: 2 i have problems with baffles i don't select flux plane to use baffles as thin walls half of this wall is in sediment and it acts like spur dike but when i use the FAVOR it didn't showed the part that is in sediment what should i Do? Thank you by the way

September 10, 2016, 04:23
#11
New Member

Arkan
Join Date: Mar 2016
Posts: 7
Rep Power: 2
Quote:
 Originally Posted by hanif pourshahbaz i have problems with baffles i don't select flux plane to use baffles as thin walls half of this wall is in sediment and it acts like spur dike but when i use the FAVOR it didn't showed the part that is in sediment what should i Do? Thank you by the way
decrease mesh size

September 10, 2016, 14:33
#12
New Member

hanif pourshahbaz
Join Date: Jun 2016
Posts: 15
Rep Power: 2
Quote:
 Originally Posted by arkan decrease mesh size
ive done it
but the baffle that is in sediment remains as nothing

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