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[blockMesh] Geometry by blockMesh

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Old   October 27, 2014, 01:17
Default Geometry by blockMesh
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Mominul MuKuT
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Experimentally I have investigated the effect of a special type of VG on flow separation in a diffuser of a wind tunnel. Wind tunnel geometry is as like attached image:

Using blockMesh, I have made the flow domain of wind tunnel including the diffuser section which is as below:



But I don't understand how can I make the VG geometry over the bottom plate of wind tunnel upstream of diffuser [see first image]. Is it possible to make VG geometry by blockMesh? or any other software necessary in this regard?

Thanks in advance.
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Old   October 28, 2014, 04:00
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Hello! Any suggestion? I am waiting for your kind suggestion/advice regarding this.....
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Old   October 28, 2014, 05:12
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Hi,

I do not understand your problem, maybe one of the GUI will support you with more complex Blockmesh geometries, have a look at SwiftBlock http://openfoamwiki.net/index.php/Contrib/SwiftBlock

http://www.cfd-online.com/Forums/ope...s-meshers.html
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Old   October 28, 2014, 05:27
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Dear elvis,

Thanks for reply. Using blockMesh, I have made the domain as shown below:


Now I would like to introduce VG inside this flow domain like as shown below:


How can I do this?

Thanks
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Old   October 29, 2014, 05:38
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Hi Mominul,

if the VGs have a very "straight-forward" geometry, you could use blockMesh. You just have to figure out a way, how to lay the blocks around the VGs.

Anyhow, using snappyHexMesh might be a lot easier.

Best regards
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Old   October 29, 2014, 05:48
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Dear Ruli,

Actually the VG is a rectangular vane VG which is placed 25 deg with flow direction. So, it is possible to make such vg having 25 deg angle with x direction by blockMesh?

And before using snappyHexMesh, may be it is necessary to make stl of such VG, right?


Thanks
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Old   October 29, 2014, 05:59
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Dear Mukut,

Quote:
Originally Posted by mukut View Post
Actually the VG is a rectangular vane VG which is placed 25 deg with flow direction. So, it is possible to make such vg having 25 deg angle with x direction by blockMesh?
Hmm, hard to say without image of the VG. I guess, the shape is quite simple, so you could give it a try with blockMesh.
You have to keep in mind: in blockMesh you have to manually define all the blocks, which your mesh consists off (as you did with the basic wind tunnel shape).
Thus, if the VGs have a simple rectangular shape, it might be possible with blockMesh, although it is tideous work...

Quote:
Originally Posted by mukut View Post
And before using snappyHexMesh, may be it is necessary to make stl of such VG, right?
That is true!

Best regards
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Old   October 29, 2014, 06:22
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Here is the closer look of 3 VG arrangement upstream of diffuser.


VG length is 28mm, height 7mm, thickness 1mm
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Old   October 29, 2014, 06:45
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Dear Ruli,

Would you please share your idea about how to make VG with blockmesh? This VG is not parallel with x direction. I am waiting to know your idea.

Thanks again
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