[ICEM] hexa meshing prob

wadoud31 · November 12, 2010, 07:15

i am new to this forum and I need help, I have a problem with hexa meshing

johnp · November 12, 2010, 12:36

Welcome. You will need to provide more details of your specific problem in order to get any meaningful responses.

PSYMN · November 14, 2010, 22:22

wadoud31 · November 17, 2010, 09:21

Thank you I want to study the flow in a channel cross dawn, but I have problems meshing (hexa) here is the geometry

johnp · November 17, 2010, 10:11

The geometry doesn't look too difficult to me. There is an excellent tutorial on youtube that will get you started. It's in three parts, here's the link to the first:

http://www.youtube.com/watch?v=tYrbScUH9RE

PSYMN · November 17, 2010, 12:01

For success with this sort of model, you should pay close attention to the options for "shifted periodic" if you are modeling the tip gap. However, if you are not modeling the tip gap (2D certainly does not include the tip gap), try modeling the channel instead of around the blade (to avoid much of the periodicity).

You can find info about that in part 1 of the you-tube mini-series or by searching those terms in CFD-Online.

Best regards,

Simon

wadoud31 · November 18, 2010, 08:16

thank you for your kindness, I saw the video but I could not do better now, the mesh quality is very poor, so I can send you the geometry and try to make the mesh, I'd be very grateful

PSYMN · November 18, 2010, 11:37

I am already a little overcommitted right now. Maybe someone else can help.

Note, you still haven't even said what your problem with Hexa is...

wadoud31 · November 18, 2010, 13:15

my problem that I can not get a good mesh with refinement on the walls like this example, thank you my friend

johnp · November 18, 2010, 13:53

Can you post an image of the blocking strategy you are trying? This will make the problem easier to diagnose.

wadoud31 · November 18, 2010, 14:06

thank you for your interest in my problem, I want a mesh like this examle (aube)

wadoud31 · November 18, 2010, 14:47

like this example

wadoud31 · November 18, 2010, 14:48

this my blocking

PSYMN · November 18, 2010, 15:00

How about a picture that shows the problem?

wadoud31 · November 18, 2010, 15:07

htis is the picture

wadoud31 · November 19, 2010, 15:48

hello everyone, I'm still waiting assistance, thank you.

PSYMN · November 19, 2010, 17:54

You need to generate an Ogrid.

GO to split blocks => OGrid and select all the blocks.

Then Select all the outer edges so Ogrid won't form there.

THen Apply.

The Ogrid will form around the remaining edges that you did not select (the edges around your airfoil.)

I guess I can help with this simple thing if you post the files. (*.prj, *.tin and *.blk)

wadoud31 · November 20, 2010, 05:05

thank you simon for your advice, I try to do that but I can not,how i can send the requested file, my email: wadoud31@live.fr

wadoud31 · November 23, 2010, 12:58

hello everybody, I need experimental data to test MUR 45 of the geometry VKI CT2 and also the conditions of the flow (transonic flow), thank you

wadoud31 · December 1, 2010, 11:16

November 12, 2010, 07:15	hexa meshing prob	#1
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	i am new to this forum and I need help, I have a problem with hexa meshing

November 17, 2010, 12:01	more specifically...	#6
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	For success with this sort of model, you should pay close attention to the options for "shifted periodic" if you are modeling the tip gap. However, if you are not modeling the tip gap (2D certainly does not include the tip gap), try modeling the channel instead of around the blade (to avoid much of the periodicity). You can find info about that in part 1 of the you-tube mini-series or by searching those terms in CFD-Online. Best regards, Simon

November 19, 2010, 17:54	What is the problem?	#17
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	You need to generate an Ogrid. GO to split blocks => OGrid and select all the blocks. Then Select all the outer edges so Ogrid won't form there. THen Apply. The Ogrid will form around the remaining edges that you did not select (the edges around your airfoil.) I guess I can help with this simple thing if you post the files. (.prj, .tin and *.blk)

November 23, 2010, 12:58	transonic flow: experimental data of (MUR 45 of VKI CT2)	#19
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	hello everybody, I need experimental data to test MUR 45 of the geometry VKI CT2 and also the conditions of the flow (transonic flow), thank you

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November 12, 2010, 12:36		#2
johnp Member john Join Date: Aug 2010 Location: pasadena, va, usa Posts: 36 Rep Power: 16	Welcome. You will need to provide more details of your specific problem in order to get any meaningful responses.

November 14, 2010, 22:22		#3
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47

November 17, 2010, 10:11		#5
johnp Member john Join Date: Aug 2010 Location: pasadena, va, usa Posts: 36 Rep Power: 16	The geometry doesn't look too difficult to me. There is an excellent tutorial on youtube that will get you started. It's in three parts, here's the link to the first: http://www.youtube.com/watch?v=tYrbScUH9RE

November 18, 2010, 08:16		#7
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	thank you for your kindness, I saw the video but I could not do better now, the mesh quality is very poor, so I can send you the geometry and try to make the mesh, I'd be very grateful

November 18, 2010, 11:37		#8
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	I am already a little overcommitted right now. Maybe someone else can help. Note, you still haven't even said what your problem with Hexa is...

November 18, 2010, 13:15		#9
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	my problem that I can not get a good mesh with refinement on the walls like this example, thank you my friend

November 18, 2010, 13:53		#10
johnp Member john Join Date: Aug 2010 Location: pasadena, va, usa Posts: 36 Rep Power: 16	Can you post an image of the blocking strategy you are trying? This will make the problem easier to diagnose.

November 18, 2010, 14:06		#11
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	thank you for your interest in my problem, I want a mesh like this examle (aube)

November 18, 2010, 15:00		#14
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	How about a picture that shows the problem?

November 19, 2010, 15:48		#16
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	hello everyone, I'm still waiting assistance, thank you.

November 20, 2010, 05:05		#18
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	thank you simon for your advice, I try to do that but I can not,how i can send the requested file, my email: wadoud31@live.fr

December 1, 2010, 11:16		#20
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16