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-   -   [ICEM] Meshing of fuel tank (http://www.cfd-online.com/Forums/ansys-meshing/120709-meshing-fuel-tank.html)

Far July 12, 2013 16:19

Meshing of fuel tank
 
Here is Hexa blocking for Fuel tank. I had to use four o-girds for the hemisphere (Fig 3) (with cut at outlet) pipe with outlet. One of them was without selecting face and other three were with faces selected. Also internal wall was declared wall by associating face to surface.

http://imageshack.us/a/img11/1079/qb90.jpg

http://imageshack.us/a/img163/6706/ljd3.jpg

http://imageshack.us/a/img694/6378/rk1j.jpg

http://imageshack.us/a/img96/9066/ah00.jpg

http://imageshack.us/a/img842/8222/k126.jpg

http://imageshack.us/a/img838/9279/e4ul.jpg

http://imageshack.us/a/img812/2069/sjwr.jpg

http://imageshack.us/a/img809/6043/y1ci.jpg

http://imageshack.us/a/img196/8259/8gks.jpg

http://imageshack.us/a/img839/2144/5vcy.jpg

Far July 12, 2013 16:22

http://imageshack.us/a/img854/466/hssj.jpg

http://imageshack.us/a/img11/9809/hxlp.jpg

http://imageshack.us/a/img832/1456/5bxp.jpg

http://imageshack.us/a/img94/6308/vi0r.jpg

http://imageshack.us/a/img833/5540/ud4d.jpg

http://imageshack.us/a/img32/3504/xdw0.png

cesarcg July 12, 2013 19:01

Astonishing work far! :)

Far July 12, 2013 19:06

For the hemisphere portion at outlet, I have developed blocking strategy (three to four different blockings tried and finally chosen one which gave the best quality in terms of determinant 2*2*2 and angle) on simple case ( same geometry with other parts deleted) as shown here http://goo.gl/69B4U

Edit: Also used sub-topo and later on merged blocking and vertices.

sarisacil July 13, 2013 14:01

beginner
 
1 Attachment(s)
hello, my name is sari. need some help for my first time use ansys icem and join forum. i just try to learn ICEM and found some trouble. i was trying make a cube and then mesh it, but then it become worse just like you see on a pict Attachment 23464
i still do not understand what is the difference between 'blocking' and 'meshing' ?
thanks

Far July 13, 2013 14:08

Blocking is intermediate step between meshing and geometry. When you associate blocking to geometry, adjust mesh spacing and sizing, you will get mesh.

cesarcg July 15, 2013 00:06

Quote:

Originally Posted by sarisacil (Post 439557)
hello, my name is sari. need some help for my first time use ansys icem and join forum. i just try to learn ICEM and found some trouble. i was trying make a cube and then mesh it, but then it become worse just like you see on a pict Attachment 23464
i still do not understand what is the difference between 'blocking' and 'meshing' ?
thanks

Dear Sari,

You can also think of blocking as defining the behavior of your mesh by means of the location and topology of the edges and vertices. That is, if you move the vertices and edges of your blocking, the distribution of the mesh will change according to this. Similarly, if you have two different blocking topologies, the generated mesh will change in both of them as a result of the differences in the blocking.

I hope I made myself clear.

Regards,
CÚsar

sarisacil July 15, 2013 19:31

okay thanks. i'll try again :)

Far July 15, 2013 19:58

Geometry

http://imageshack.us/a/img24/4193/9q7r.jpg

inital main block

http://imageshack.us/a/img707/8144/5hcr.jpg

intial main block

http://imageshack.us/a/img819/9479/vxp3.jpg

meshing is not following geometry

http://imageshack.us/a/img843/6466/s7tp.jpg

Spliting and deleting to get required shape approximately

http://imageshack.us/a/img515/4403/owbo.jpg

And now association is done. although if you don't associate edges to curves (and vertex to point) for this geometry, you will still get the same shape but it may be bigger or smaller depending how you have splitted blocks. It is for sure for circular shape, without association, you wont get the mesh according to geometry and mesh will follow blocking shape (rectangle). but after association you will get required shape.

Another problem is that you won't be able to output boundary conditions if you have not done association. It is to be noted face-surface association (for 3d) is done by-default by ICEM CFD

http://imageshack.us/a/img825/4833/9nlp.jpg

mayj July 22, 2013 01:21

Tutorial on Oscillatory baffle column mesh creation
 
Do you have any suggestion on how to generate geometry and mesh for an oscillatory baffle column?
Tnx

Far July 22, 2013 03:14

Quote:

Originally Posted by mayj (Post 441123)
Do you have any suggestion on how to generate geometry and mesh for an oscillatory baffle column?
Tnx

:p ;) :cool:

mayj July 22, 2013 04:59

Ansys meshing
 
Hi Far

Thank you for the info. I checked the site, it's an awesome site.
Cheers

Far July 22, 2013 09:40

Can you please be more specific about the case you want to model?

mayj July 22, 2013 18:33

CFD Meshing
 
1 Attachment(s)
I need to generate a mixing column with following specification: the column diameter of 50mm, baffle thickness of 3mm, baffle spacing of 75mm, and air inlet 40mm from the base with a diameter of 3mm. The mesh needs to be very fine specially near the wall. I've attached the geo.
Ps: I have generated the geo, but I get error when I try to generate the volume meh.
Cheers

mayj July 24, 2013 01:08

ansys workbench
 
Hi
Would you please inform me if you or your company is able to help me with the meshing requirement using workbench? any possible related tutorial in the website?
it seems an easy task, but there's some factors such as mesh sensitivity and 2D against 3D that need to be considered.
Cheers

Far July 24, 2013 09:45

You want to mesh 2d or 3d?

cesarcg July 24, 2013 11:49

Quote:

Hi
Would you please inform me if you or your company is able to help me with the meshing requirement using workbench? any possible related tutorial in the website?
it seems an easy task, but there's some factors such as mesh sensitivity and 2D against 3D that need to be considered.
Cheers
I think that meshing that geometry with ICEM is a relatively easy task. Have you started the geometry modeling?

mayj July 24, 2013 23:08

workbench mesh
 
Hi
I'm not familiar with ICEM. I will consider it if there's some tutorial to help me to generate this mesh and if it can be saved as a format mesh which can be imported to cfx-pre.
Cheers

cesarcg July 25, 2013 14:23

Quote:

Originally Posted by mayj (Post 441813)
Hi
I'm not familiar with ICEM. I will consider it if there's some tutorial to help me to generate this mesh and if it can be saved as a format mesh which can be imported to cfx-pre.
Cheers

Use the tutorials published by Far.

sarisacil July 29, 2013 04:23

unit
 
i'd like to ask, how do i know the unit (m, cm, mm) in ICEM? thanks


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