CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ANSYS Meshing] Boolean creation error - operation would result in non-manifold bodies

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By mjthomp3

Reply
 
LinkBack Thread Tools Display Modes
Old   January 10, 2013, 03:34
Smile Boolean creation error - operation would result in non-manifold bodies
  #1
New Member
 
Akshay
Join Date: Jan 2013
Posts: 2
Rep Power: 0
thefinalyearkid is on a distinguished road
Hello! So im currently working on a project that requires me to analyze the flow around a vehicle in this case - a renault clio

So i obtained this model and saved it as a parasoild and then imported it into ANSYS, then, i generated a enclosure to depict air as usual and went about creating a boolean to substract the vehicle from the air(enclosure)

This is where the error of 'non-manifold' bodies occurs, i have read some other posts on some inability to substract surfaces and im not too sure on how to go about resolving this issure!

Please help!
thefinalyearkid is offline   Reply With Quote

Old   January 10, 2013, 04:53
Default
  #2
Member
 
Join Date: Nov 2011
Location: Czech Republic
Posts: 95
Rep Power: 5
Sixkillers is on a distinguished road
Before subtract operation I would definitely unite the hole car into a one body.
Sixkillers is offline   Reply With Quote

Old   January 10, 2013, 10:35
Default
  #3
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
Yes the problem is the surface/solid operation.
Designmodeler cannot perform an operation between solid and surface.
when you import the car, you have to fill the inside with a some solid. There is a feature called FILL in designmodeler that let's you do that.
After the fill is done, delete those surfaces as you don't need them, you can do that with body operation then delete.
Then make that rectangle and perform the Boolean feature.

A more easy way is to import your car as a solid and not as a surface, i guess this is done when exporting you car in the CAD software in which you made the car ? try an extension like IGES , or STEP...
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   January 10, 2013, 10:50
Default
  #4
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
also see this Bug in DM
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   January 10, 2013, 20:58
Smile
  #5
New Member
 
Akshay
Join Date: Jan 2013
Posts: 2
Rep Power: 0
thefinalyearkid is on a distinguished road
Ah yes! Brilliant, so the open surfaces is what causes the problem in DM,

anyhow guys i was doing some research and found this software called blender, and the link shows some amazing features that actually tell you the location of non-manifold body errors and allows for you to very simply cover up the open surfaces


the youtube link is :
http://www.youtube.com/watch?v=H6NXhfw9itI

and the website link is :
http://www.blender.org/download/get-blender/
thefinalyearkid is offline   Reply With Quote

Old   May 16, 2013, 14:38
Thumbs up my solution
  #6
Member
 
Pjotr
Join Date: Mar 2012
Posts: 30
Rep Power: 5
oewnce932c is on a distinguished road
Hi thefinalyearkid.
i got the same problem. i imported ship hull from IGES(500+ surfaces), just half hull without deck. i wanted to creat a body from it. Done 2 surfaces: deck and mid-ship.
after that tryed with Body Operation: Sew this three objects: 2 created surfaces and surface-body(IGES(500+ surfaces))
with default tolerance was warning and errors:
"Warning: Sewing operation partial failure possibly due to incompatible attributes"
"Warning: not all bodies can be sewn or converted to solid body"
and by boolean: subtract
"Error: Operation would result in non-manifold bodies"

solution was to reduce the tolerance from default value(0.0015m) to 0.015m. after that it works fine!
__________________
yachting_rus cup
world amateur racing tour
WWW.YRC.DK
oewnce932c is offline   Reply With Quote

Old   April 24, 2014, 10:42
Default non-manifold
  #7
New Member
 
saeed
Join Date: Apr 2014
Posts: 5
Rep Power: 3
saeed.marine is on a distinguished road
hi.
i have an IGES file of a container ship (KCS-hull). but it is just the surface of it. how can i turn it into an solid body? in order to perform a Boolean operation on it.
saeed.marine is offline   Reply With Quote

Old   April 24, 2014, 10:55
Default
  #8
Member
 
Pjotr
Join Date: Mar 2012
Posts: 30
Rep Power: 5
oewnce932c is on a distinguished road
load your ANSYS file. for example with this http://dropmefiles.com/en

your use DesignModeller?
__________________
yachting_rus cup
world amateur racing tour
WWW.YRC.DK
oewnce932c is offline   Reply With Quote

Old   April 24, 2014, 11:02
Default
  #9
New Member
 
saeed
Join Date: Apr 2014
Posts: 5
Rep Power: 3
saeed.marine is on a distinguished road
it is already on the net.
http://www.simman2008.dk/KCS/kcs_geometry.htm
KSC hull
yes i use DM
saeed.marine is offline   Reply With Quote

Old   April 24, 2014, 11:42
Default
  #10
Member
 
Pjotr
Join Date: Mar 2012
Posts: 30
Rep Power: 5
oewnce932c is on a distinguished road
here it is.
i took this file for ship hull http://www.simman2008.dk/PDF/KCS_hull_SVA.zip

couple of steps -> see screenshot

here is DM file for your with SOLID http://pjotr.ru/data/kcs_cfd_online.agdb

ps do your know any results or cases for KCS with self propulsion tests?!
Attached Images
File Type: jpg kcs_ship_check.jpg (30.3 KB, 70 views)
__________________
yachting_rus cup
world amateur racing tour
WWW.YRC.DK
oewnce932c is offline   Reply With Quote

Old   April 24, 2014, 11:59
Default
  #11
New Member
 
saeed
Join Date: Apr 2014
Posts: 5
Rep Power: 3
saeed.marine is on a distinguished road
i haven't worked on it myself. but surely some friends of mine know. they have done several test on it (in towing tank).
i believe you are using a later version of DM. i cannot open it!
mine is 14.0
saeed.marine is offline   Reply With Quote

Old   April 24, 2014, 12:08
Default
  #12
New Member
 
saeed
Join Date: Apr 2014
Posts: 5
Rep Power: 3
saeed.marine is on a distinguished road
can you give me an .stp file please?
saeed.marine is offline   Reply With Quote

Old   April 25, 2014, 04:40
Default
  #13
Member
 
Pjotr
Join Date: Mar 2012
Posts: 30
Rep Power: 5
oewnce932c is on a distinguished road
oh.. yes my is 15.0. do your know how to save for "older" version?

here are steps, tree in DM is in attach
0. delete two surface in the bow, above main deck
1. create line and surface in prop shaft
2. create mid line of the ship z=main deck
3. create deck surface
4. create surface at y=0, have to select many lines
5. sew ship. Solid=yes. Change Tolerance to 0,1 or less if no solid is created.

here is stp-file http://pjotr.ru/data/kcs4cfd_online.stp
Attached Images
File Type: png kcs_ship_tree.png (14.7 KB, 35 views)
__________________
yachting_rus cup
world amateur racing tour
WWW.YRC.DK
oewnce932c is offline   Reply With Quote

Old   April 27, 2014, 04:24
Default
  #14
New Member
 
saeed
Join Date: Apr 2014
Posts: 5
Rep Power: 3
saeed.marine is on a distinguished road
thank you. it was a great help to me.
what do you want to know about KCS hulls?
saeed.marine is offline   Reply With Quote

Old   June 19, 2014, 11:18
Default
  #15
New Member
 
AZ
Join Date: Jan 2014
Posts: 13
Rep Power: 3
mjthomp3 is on a distinguished road
Quote:
Originally Posted by thefinalyearkid View Post
Hello! So im currently working on a project that requires me to analyze the flow around a vehicle in this case - a renault clio

So i obtained this model and saved it as a parasoild and then imported it into ANSYS, then, i generated a enclosure to depict air as usual and went about creating a boolean to substract the vehicle from the air(enclosure)

This is where the error of 'non-manifold' bodies occurs, i have read some other posts on some inability to substract surfaces and im not too sure on how to go about resolving this issure!

Please help!




There is a very useful tutorial from ANSYS website in design modeler that
goes through all these steps but for a Sedan. I found it very usefulas you
might as well.


The basic steps go like this:
1. connect all the edges
2. Tools > merge
3. Tools > Surface patch to fill gaps in surface body
4. Use sew to convert the surface body to a solid body
with Body Operation
and lastly
5. Enclosure with 1 surface plane
Naval_Constructor likes this.
mjthomp3 is offline   Reply With Quote

Reply

Tags
boolean, meshing, non-mainfold

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Info message -> Fluent does not start Jenson FLUENT 0 December 22, 2011 18:21
creation of 3d bodies within an assembly Roland CFX 1 August 8, 2006 11:49


All times are GMT -4. The time now is 00:34.