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-   -   [ICEM] How to block this? (http://www.cfd-online.com/Forums/ansys-meshing/108470-how-block.html)

cfd seeker October 24, 2012 11:12

How to block this?
 
1 Attachment(s)
I am trying to block the wing but got stuck in the middle. I know how to block a simple wing with O-grid and C-grid but this wing has a special feature that it has a slot on the wing tip near the leading edge region which is giving me trouble to block the wing tip region. Blowing will be done from this slot in the tip region, so this portion needs extra mesh density and needs to be put in the separate block I guess. Kindly give me suggestions how to tackle slot on the wing tip while blocking. Thanks
Regards

energy382 October 25, 2012 13:31

1 Attachment(s)
wow, that one was really difficult. you need c-grid (far field), o-grid and y-grid (leading+trailing edge) and two other o-grids for the slot.

but i finally got the right blocking approach. you've to adjust some edges to get reasoable angles, but that should be a work of some minutes.

sorry, but don't have the time to do this.

good luck

diamondx October 25, 2012 19:28

cfd seeker, if you are wondering how energy382 did it, take a look at this thread, it will help you a lot:
http://www.cfd-online.com/Forums/ans...ic-trough.html

The same approach was used, or may be slightly different. am i wrong christoph ??

Far October 25, 2012 23:44

Quote:

Originally Posted by energy382 (Post 388540)
wow, that one was really difficult. you need c-grid (far field), o-grid and y-grid (leading+trailing edge) and two other o-grids for the slot.

but i finally got the right blocking approach. you've to adjust some edges to get reasoable angles, but that should be a work of some minutes.

sorry, but don't have the time to do this.

good luck

Very efficient use of quarter O-grid

cfd seeker October 26, 2012 03:20

Thanks alot guys thank you very much energy,diamondx and far. Its a long long weekend and damn I don't have Ansys in home to check this blocking but thanks alot energy for your effort :)

energy382 October 26, 2012 04:57

Sorry, I haven't seen this thread yet. But in my opinion, one of the most important thing is to work with the index, to stay on top of things.
So if I do my ogrid or y-grid on the wing, I use index and just display required blocks.

What I'm trying to say is, that it's very important to have a well-structured working method (at least if you've to deal with several c-grids, o-grids and y-grids).

Not until then (at the end), I adjust the outer edges with "move vertex" functions (to improve cell angles, det. etc)

Maybe, I could do a video about my working method if required.


Quote:

Originally Posted by diamondx (Post 388583)
cfd seeker, if you are wondering how energy382 did it, take a look at this thread, it will help you a lot:
http://www.cfd-online.com/Forums/ans...ic-trough.html

The same approach was used, or may be slightly different. am i wrong christoph ??


cfd seeker November 1, 2012 02:46

I checked the blocking but there are so many cuts, the things in wing tip region are all messed up and it is very difficult for me to undestand. energy382 can you kindly explain me step by step procedure how you did it or kindly post a pic of every step if possible....

Far November 1, 2012 03:46

Quote:

Originally Posted by energy382 (Post 388623)

Maybe, I could do a video about my working method if required.

If you could show us the pics (or video) after each step and specially how you manage to make the double quarter O-grids.

cfd seeker November 1, 2012 09:35

Quote:

If you could show us the pics (or video) after each step and specially how you manage to make the double quarter O-grids.
If the acting head of cfd-online Far(:p) is struggling with this blocking then it must be a difficult one :(
Time for the Simon to come into action :D

Far November 1, 2012 09:42

Quote:

Originally Posted by cfd seeker (Post 389665)
If the acting head of cfd-online Far(:p) is struggling with this blocking then it must be a difficult one :(
Time for the Simon to come into action :D

It is funny :D. LMAO @ acting head.

Actually I am busy with family and teaching thermodynamics II course. Now I have free time. I will try...

cfd seeker November 1, 2012 10:09

Quote:

It is funny . LMAO @ acting head.
:D

Quote:

Actually I am busy with family and teaching thermodynamics II course. Now I have free time. I will try...
do try to make a video as well :)

diamondx November 1, 2012 13:56

this my try, since i don't have time i blocked only the wing, i'm not sure if it will get you a good quality:
https://dl.dropbox.com/u/35161486/cfd-seeker2.png

i'm sure there is a better alternative to the y-grids behind, christoph's method is way better than this one.
If you want an idea on the blocking i used:
https://dl.dropbox.com/u/35161486/cfd-seeker1.png

cfd seeker November 2, 2012 05:58

Thanks but you didn't take care of slot on the wingtip, the O-grid you put is crossing the slot which is not needed instead slot needs to be put in the separate block. Actually slot is creating trouble otherwise its very easy to block a simple wing using C-grid or O-grid

diamondx November 2, 2012 08:51

Quote:

slot needs to be put in the separate block
Why you want slot in different block ?

cfd seeker November 2, 2012 09:50

Quote:

Why you want slot in different block ?
If O-grid will be crossing the slot then how you will control the no. of nodes on the edges of slot? That's my understanding that if we manage to put slot in the separate block then it will be the best topology, what you say?

diamondx November 2, 2012 10:34

i have full control of number of nodes in the slot. as you can see at the edges that will be associated to the slot...

cfd seeker November 2, 2012 12:40

Quote:

Originally Posted by diamondx (Post 389887)
i have full control of number of nodes in the slot. as you can see at the edges that will be associated to the slot...

Ok nice but can you explain how you did it and how energy382 did it? I mean what's the difference?

diamondx November 2, 2012 13:36

energy382's method is difficult... i tried blocking same way without any success. mine is just an o-grid. and using index blocking to filter and split just the block that contains the slot.

cfd seeker November 2, 2012 13:43

Quote:

Originally Posted by diamondx (Post 389929)
energy382's method is difficult... i tried blocking same way without any success. mine is just an o-grid. and using index blocking to filter and split just the block that contains the slot.

Which edges you associated with the curves of slot?

diamondx November 2, 2012 13:46

the edges in red

https://dl.dropbox.com/u/35161486/cfd-seeker3.png


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