[mukut]

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.

[mukut]

Hello! Any suggestion? I am waiting for your kind suggestion/advice regarding this.....

[elvis]

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

[mukut]

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

[Ruli]

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
Julian

[mukut]

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

[Ruli]

Dear Mukut,

Originally Posted by mukut

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...

Originally Posted by mukut

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

That is true!

Best regards
Julian

[mukut]

Here is the closer look of 3 VG arrangement upstream of diffuser.


VG length is 28mm, height 7mm, thickness 1mm

[mukut]

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