[mollaee.saeed]

Hello Every one:
1-in my case i can make st domains but it doesn`t make ST block what is the reason?(it can be UNST block meshed)
2-How can i Set Multi block to make ST mesh?
3-Can any one please explain concepts of multi blocking OR it is full experimental?
the number of nodes are 8
Here is Pictures and File

[rmatus]

Saeed:

I can't tell from the pictures why you cannot assemble a structured block on this geometry. The attached file shows an example structured grid on your geometry.

Hope this helps,
Rick

[mollaee.saeed]

Rick:
thanks for your response here is a link that i uploaded my file there, would you please take look at it and say your opinion about how to make st block and how to have better st domains and refine it?
http://www.filetolink.com/66e82f4ace
or
http://s6.picofile.com/file/8218734276/1.rar.htm

[rmatus]

Saeed:

The problem was the corners of the top and bottom domains did not match the corners of the domains on the sides, so in effect it was trying to assemble a block where the edges did not match.

I rebuilt the top and bottom domains with the corners matching the side domains and it assembles fine. Note, you have to use Create, Assemble Special, Domain to force the corners to be in the correct locations. The automatic assembly uses some heuristics to determine the best topological corner locations, and in this case they do not match the corners of the adjacent domains. Using Create, Assemble Special lets you explicitly choose where the corners will be.

The attached images show the original topology and the new topology. I've also attached a Pointwise project file with just the new block in it.

Hope this helps,
Rick

[mollaee.saeed]

Dear Rick:
thanks a lot for your kindness.your great Responses shows your caring manner that was really helpful.
but i am still wondering how can i refine part of mesh directly after examine?

[rmatus]

Saeed:

Refine could mean a couple of things in regard to a structured grid: adding grid points or running the elliptic smoother on it.

If you want to add more grid points to an existing domain or block, I recommend using the Grid, Dimension command. It will allow you to change the number of grid points on a connector and will show you how that will affect other connectors in order to retain a dimensionally balanced structured grid system.

To elliptically smooth a domain or block, select the domain(s) or blocks(s) you want to smooth, and then use Grid, Solve.

I'd recommend you take a look at the Pointwise Axial Turbine tutorial to see these commands in action. Or, if you prefer videos, you can watch here: http://www.pointwise.com/videos/mult...StructuredPt1/ and http://www.pointwise.com/videos/mult...StructuredPt2/.

Rick

[mollaee.saeed]

Rick:
Thanks for your advice and link.
but i`m still having problem with the Block Assembly,i could solve the previous problem that you said the method of Domain Assembly,and now that i want to assemble these domains to make block at tip,no block is created.
http://www.filetolink.com/b52636b311
1-How can i assemble these domains?(18 domains)
2-I used O-H domain for back hole since if i wanted to use simple domain it just connect the S-points(Are shown in Picture) together and did not make a good Domain(shaded in picture).there for I had to use O-H domain.would you please say your opinion for this problem?
Best Regards

[rmatus]

Saeed:

Your approach of using an O-H topology is a good way to go. You'll just end up with 5 blocks instead of a single block when you use this approach.

The Pointwise project file here (https://pointwise.sharefile.com/d-s3844623a9244b60b) has a completed 5 block topology for this geometry. Note, it is a very coarse grid and I did not spend any time improving the grid quality. It is only intended as an example of the block topology.

Hope this helps,
Rick

[mollaee.saeed]

Dear Rick:
Thanks for your great help I really appreciate it.
it was really helpful and i am using it it remesh my topology.
the thing that i can`t Recognize is that, does multiblocking have special method or we must gain that with try and error and experiment?
i mean how you understood that you should separate the upper domain to what you`ve seprated into, was it just the matter of number of grids?

[rmatus]

Saeed:

There is a bit of an art to determining good multi-block topologies for complicated geometries.

Here are a couple resources that can help:

Advanced structured grid techniques webcast: This is a webinar from last year where one of our engineers discusses interesting topologies to use for some typical cases.

Pointwise tutorials: There are a couple of Pointwise tutorials that cover building multi-block structured gridding - Boeing 747 Nacelle and Axial Turbine Blade. You can find them in Pointwise under the Help, Tutorial Workbook... menu option.

The CreateOH Glyph script: This is a Pointwise Glyph script that converts an H-topology to an O-H, 5-block topology automatically. It is a freely available for download from the Glyph Script Exchange on Github.

In addition, keep an eye on the Pointwise training web page. We are working on an Advanced Structured Grid online training course that should be available sometime next year.

And of course, ask any questions if you need more help, either here or through Pointwise technical support (support@pointwise.com).

Thanks,
Rick

[mollaee.saeed]

Dear Rick:
Thanks for your great help and useful films I watched them and lot of my problems were mentioned there and i used it a lot.
i will be waiting for your Advanced Structured Grid online training course i`m sure that is going to be very helpful
Best Regards
Saeed