# [GAMBIT] Curved Tube Using a Two Phase Approach

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 August 20, 2014, 05:06 Curved Tube Using a Two Phase Approach #1 Member   CR-7 Join Date: Jun 2011 Location: Malaysia Posts: 62 Rep Power: 6 Good Afternoon CFD Online I'm trying to simulate the following geometry but I need some help about how to draw it correctly as the way of drawing 2D face and then Revolve or Sweep is using for the first time. Then, when I mess some of 3D geometries I could not get the following as I'm using Hex/Wedge and Cooper

 August 20, 2014, 06:20 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 Create one section (disk) Create one edge which will describe your center line Then you can sweep your face (disk) with your edge, and you get your 3d volume. Now if you want a full hexa mesh (no pave), you have to split your domain. By decomposinf it, you will get a nice hexa mesh. In your case, the decomposition is O-grid type. Typically you draw a square inside your disk, and you split your disk with the square. Check here for instance: 3D pipe o-grid GAMBIT __________________ In memory of my friend Hervé: CFD engineer & freerider

August 20, 2014, 10:58
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First of all ,
For drawing 3D Pipe O-rigid. I followed a new way to get that pipe
and my pipe is below, take a look and then give your evaluation
Attached Images
 My Mesh.jpg (101.2 KB, 18 views)

 August 20, 2014, 11:33 #4 Member   CR-7 Join Date: Jun 2011 Location: Malaysia Posts: 62 Rep Power: 6 And For my thread. I made a circle face and to connect the center line with that circle I did not get the method. with pictures if don't mind

August 21, 2014, 01:13
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Quote:
 Originally Posted by Heat Pipe First of all , For drawing 3D Pipe O-rigid. I followed a new way to get that pipe and my pipe is below, take a look and then give your evaluation
This is not an O-grid. Doing this you won't be able to mesh the inner pipe with hexa (but with pave you will)

As I said, you need to have a square inside your disk

Quote:
 Originally Posted by Heat Pipe And For my thread. I made a circle face and to connect the center line with that circle I did not get the method. with pictures if don't mind
http://www.cfd-online.com/Forums/ansys-meshing/124634-how-plot-s-pipe.html
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In memory of my friend Hervé: CFD engineer & freerider

August 21, 2014, 04:10
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Okay MAX
if I considered my geometry as presented above as a concentric annuli is my procedure correct from drawing and meshing

To connect the arc with the Slice have faced a problem as below
I used Radius 20 mm for both the arc and the face
Attached Images
 Untitled.jpg (65.0 KB, 15 views)

 August 21, 2014, 04:13 #7 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 is the yellow edge the path for sweeping? if yes, then it cannot be coplanar to your disk __________________ In memory of my friend Hervé: CFD engineer & freerider

August 21, 2014, 04:23
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Yes Max the yellow edge is the path of sweeping
I did point in the center of disc to be the center of that path got this
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 Untitled.jpg (93.2 KB, 10 views)

 August 21, 2014, 04:38 #9 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 your edge has to belong to (xz) plane __________________ In memory of my friend Hervé: CFD engineer & freerider

August 21, 2014, 04:55
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Even with XZ failed
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August 21, 2014, 04:58
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Now the face in XY and the path in XZ
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 Untitled.jpg (93.9 KB, 3 views)

 August 21, 2014, 05:08 #12 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 align your edge with your disk so that 2 points are coincided Then in sweep too select perpendicular type Untitled.png Untitled1.png __________________ In memory of my friend Hervé: CFD engineer & freerider

 August 21, 2014, 05:23 #13 Member   CR-7 Join Date: Jun 2011 Location: Malaysia Posts: 62 Rep Power: 6 Let copy your dimensions in last two pictures 1- Radius of Disc is ( ? ) and xz plane right? 2- Selecting circular arc with the third method Radius is ( ? ) Start angle ( ? ) end angle ( ? ) the center you selected the vortex of the disc or how and also you selected xz plane Sorry for my too much quires

 August 21, 2014, 05:31 #14 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 1- 15 in (xy) plane 2- just like yours , ie : *radius 40 *start angle 0 *end angle 210 *(zx) plane then you need to rotate your edge with 90° angle along (0 1 0) __________________ In memory of my friend Hervé: CFD engineer & freerider

August 21, 2014, 05:53
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Now so-so
I got the geometry but what happened I didn't understand why?
Maybe my directions or orientations .

I followed all yr instructions

* Disk with 15
* Arc with 40 and 0-210 angles of start and end. The center was the disk vortex .
Than I did rotation to the path line and finally sweep with perpendicular type but I got this
Attached Images
 Untitled.jpg (70.8 KB, 6 views)

 August 21, 2014, 06:31 #16 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 *create a plane with 500x500 (zx) *split your tube with the plane, you will get 2 symetric domains. Delete one and check if the geometry is ok Untitled.png __________________ In memory of my friend Hervé: CFD engineer & freerider

August 21, 2014, 07:02
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I did your last point but as I told you something goes wrong !!!!!
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 Untitled.jpg (93.4 KB, 9 views)

 August 21, 2014, 07:23 #18 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 if you don't explain what the problem is, I cannot help you. From your pictures everything seem to be ok __________________ In memory of my friend Hervé: CFD engineer & freerider

 August 21, 2014, 09:53 #19 Member   CR-7 Join Date: Jun 2011 Location: Malaysia Posts: 62 Rep Power: 6 Dear Max .. My problem is before doing sweep, the disk and Arc-Path r connecting wrongly Not like yours. For that just take a look at the last picture after splitting the geometry by that plane

 August 21, 2014, 09:57 #20 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,068 Rep Power: 31 It doesn't make any difference. Interpret this edge as a vector. Important, is the way to build your geometry: and you did it correctly __________________ In memory of my friend Hervé: CFD engineer & freerider

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