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[GAMBIT] 3D mesh for pipe intersection

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Old   May 26, 2010, 19:25
Question 3D mesh for pipe intersection
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Pranab N Jha
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Hello everyone,
I am trying to mesh a pipe intersection as shown in the fig attached. I am not able to mesh the main pipe using cooper as gambit tells me that the face at the intersection is not mappable or not a correct source face. Also, if I create only a single volume by 'intersection' of the two pipes, how will I mesh the volume in the first place? I want to keep structured mesh (hex).

I first created two volumes (one for each pipe). I kept the intersecting face between the two pipes so that I could define the volumes (my plan is to define this intersection face with internal BC). Then I tried to mesh inlet face of the bigger (main) pipe and apply 'Cooper' in the axial direction and Gambit never took the spacing that I specified.
How to mesh the intersection and how can I control my mesh density in the direction I want?


My main aim is to study the flow of two different fluid phases in the main pipe. So I will have gas inflow from the smaller pipe and will run in Fluent using VOF. I have already done some simple runs in two-phase with single pipe having split inlet.

Can somebody help me with my problem?
Thanks in advance.
Pranab
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Old   May 27, 2010, 01:48
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If you need a full hexa mesh, then you have to decompose your domain
check gambit tutorial: 7. MODELING FLOW IN A TANK (especially step 5)
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Old   May 27, 2010, 09:59
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Max,
I will check it out and get back.
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Old   May 28, 2010, 01:33
Thumbs up Got it!
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Hi,
I got the mesh I wanted. Well not exactly, but yes I do know now how to do it. The tutorial was helpful and I also searched a pdf on the net. My mesh looks something like attached below. Domain decomposition is the key, so that I could used cooper to project once I get the source faces correct.
Thanks,
Pranab
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