[GAMBIT] Stairstep meshing in Gambit

zaynah04 · November 14, 2012, 09:45

yes i want to.

-mAx- · November 15, 2012, 01:51

only one size function................

Sans titre1.jpg Sans titre2.jpg

The only problem is between faces 133 & 139 (a combination of split and connect should fix the issue)
Sans titre3.jpg

zaynah04 · November 15, 2012, 04:11

hi..
did as you told and got that error
"mesh of face.334 contain 1 highly skewed element"

-mAx- · November 15, 2012, 04:14

what are your parameters for your size fonction?

zaynah04 · November 15, 2012, 04:21

tet/hybrid, tgrid and 10

-mAx- · November 15, 2012, 04:25

Quote:

Originally Posted by -mAx-

what are your parameters for your size fonction?

http://aerojet.engr.ucdavis.edu/gamb...ommands_create

I used tet/Hexcore
http://aerojet.engr.ucdavis.edu/gamb...chemes_hexcore

zaynah04 · November 15, 2012, 04:35

sorry i misread.

0.03
1.3
1

-mAx- · November 15, 2012, 04:51

I used
1
1.2
20

zaynah04 · November 26, 2012, 05:05

hi
did you mesh the faces first?
and my PC is quad core with 16 Gb of ram..i still can not mesh it.

-mAx- · November 26, 2012, 05:08

If I meshed the surface then it is only building's surfaces.
What kind of error do you receive?

zaynah04 · November 26, 2012, 05:13

volume cannt be meshed without faces sucessfully meshed

-mAx- · November 26, 2012, 06:04

then you have skewed cells for sure, check where I pointed out (post #22)

zaynah04 · November 26, 2012, 09:08

i did of course as you recommended for in post#22...

still it says i have skewed elements...
sometimes it meshes then all freeze and i have to start again..

-mAx- · November 26, 2012, 09:28

go to examine mesh and check where are those cells.

zaynah04 · December 6, 2012, 05:38

dear max,

after i split n connect faces. i then mesh the faces using tri pave

then i mesh the volume.
attachd is the error i found.

can you please enlighten me ?

cheers

zaynah04 · December 6, 2012, 05:57

hi
what to do when we have highly skewed elements? it say my mesh has 63 highly skewed elements...;(

thanks

-mAx- · December 6, 2012, 06:54

fix those skewed elements.
First, check where they are, and try to find any topology which is responsible for the skewness

Kanarya · February 20, 2013, 06:37

Hi,
I am trying to use two size function together but it seems doesnt work. my geometry is 3D I would like to have dense mesh y+=1 near the wall and at the same time to have coarser mesh in flow direction. it it seems like I am getting dense mesh near the wall but I got same mesh size in direction of flow. the other problem is gambit giving me problem with the memory!
thanks in advance!

-mAx- · February 20, 2013, 08:14

what parameters did you give for size function?

Kanarya · February 20, 2013, 09:01

Quote:

Originally Posted by -mAx-

what parameters did you give for size function?

Hi max,
thanks for quick answer!
my geometry is 170 1500 190 in mm. first size function is 1 to 3 with growthrate 1.2. and y direction 3 to 8 with same growthrate.

thanks in advance!!!

November 15, 2012, 04:14		#24
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	what are your parameters for your size fonction? __________________ In memory of my friend Hervé: CFD engineer & freerider

November 15, 2012, 04:51		#28
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	I used 1 1.2 20 __________________ In memory of my friend Hervé: CFD engineer & freerider

November 26, 2012, 05:08		#30
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	If I meshed the surface then it is only building's surfaces. What kind of error do you receive? __________________ In memory of my friend Hervé: CFD engineer & freerider

November 26, 2012, 06:04		#32
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	then you have skewed cells for sure, check where I pointed out (post #22) __________________ In memory of my friend Hervé: CFD engineer & freerider

November 26, 2012, 09:28		#34
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	go to examine mesh and check where are those cells. __________________ In memory of my friend Hervé: CFD engineer & freerider

November 14, 2012, 09:45		#21
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	yes i want to.

November 15, 2012, 01:51		#22
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	only one size function................ Sans titre1.jpg Sans titre2.jpg The only problem is between faces 133 & 139 (a combination of split and connect should fix the issue) Sans titre3.jpg __________________ In memory of my friend Hervé: CFD engineer & freerider

November 15, 2012, 04:11		#23
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	hi.. did as you told and got that error "mesh of face.334 contain 1 highly skewed element"

November 15, 2012, 04:21		#25
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	tet/hybrid, tgrid and 10

November 15, 2012, 04:35		#27
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	sorry i misread. 0.03 1.3 1

November 26, 2012, 05:05		#29
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	hi did you mesh the faces first? and my PC is quad core with 16 Gb of ram..i still can not mesh it.

November 26, 2012, 05:13		#31
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	volume cannt be meshed without faces sucessfully meshed

November 26, 2012, 09:08		#33
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	i did of course as you recommended for in post#22... still it says i have skewed elements... sometimes it meshes then all freeze and i have to start again..

December 6, 2012, 05:57		#36
zaynah04 Senior Member zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 13	hi what to do when we have highly skewed elements? it say my mesh has 63 highly skewed elements...;( thanks

December 6, 2012, 06:54		#37
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	fix those skewed elements. First, check where they are, and try to find any topology which is responsible for the skewness __________________ In memory of my friend Hervé: CFD engineer & freerider

February 20, 2013, 06:37	Gambit size function problem!	#38
Kanarya Senior Member Join Date: May 2011 Posts: 231 Rep Power: 15	Hi, I am trying to use two size function together but it seems doesnt work. my geometry is 3D I would like to have dense mesh y+=1 near the wall and at the same time to have coarser mesh in flow direction. it it seems like I am getting dense mesh near the wall but I got same mesh size in direction of flow. the other problem is gambit giving me problem with the memory! thanks in advance!

February 20, 2013, 08:14		#39
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	what parameters did you give for size function? __________________ In memory of my friend Hervé: CFD engineer & freerider

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