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

[ICEM] Generating surface from spline (error)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 27, 2011, 06:21
Default Generating surface from spline (error)
  #1
TKE
New Member
 
TKE's Avatar
 
Jozsef Rideg
Join Date: Feb 2011
Location: Budapest, Hungary
Posts: 21
Rep Power: 6
TKE is on a distinguished road
Hi,

I have the following problem in ICEM CFD. I have a certain geometry, built up from 6 different curves. I would like to make it 3D (with simple, normal extrusion, or copy in z-direction).

Create/Modify surface->Loft Surface over Several Curves
1) With the suction side of the airfoil, I recieved the following message:

2 curves
gk_cre_srf_loft_crvs GEOM srf.03 0.1 4 10 4 0 1
Error: {Large aspect number in GM90


2) With the top boundary, I recieved the following error message:

0 curves
2 curves
gk_cre_srf_loft_crvs GEOM srf.03 0.1 2 8 4 0 1
error processing E_180
proj bspline error: NaN's encountered in bspline
Error: {Unable to create surface in ProjLib
}


3) With the pressure side of the airfoil surface there was no problem.

4) With the straight lines of inlet and oulet of the airfoil surface there were no problems, neither.

When I tried to obtain the 3D geometry with sweeping, or connecting these curves as "simple surfaces", the resulting surfaces were different (or when I swept the surface, and defined the curves at the end of surface, there was a difference between the curves). I expected this difference to be only a graphical error (because of graphic card, RAM, etc), as I experienced similar phenomena with certain CAD-softwares earlier. But this was not the case in ICEM.

This caused for me a segmentation violation, negativ volume, etc. when I generated the mesh after block association, etc.

I think it can be a kind of problem, or bug with ICEM CFD handling of splines and generating surfaces from it. What I found strange, when I converted into unstructured mesh, and extruded it, the result was perfect (another problem how to define boundary conditions, surface on that mesh, or what to to with blocks there, how to associate if there is no surface, and why it converted the periodic bc-s into walls automatically, etc).

Regards,
TKE

p.s.: It is related somehow my earlier, "segmentation violation" thread as well.
3D mesh of airfoil from 2D (segmentation violation)
Attached Images
File Type: jpg 01_error_icem.jpg (32.8 KB, 16 views)
File Type: jpg 02_overview_of_violated_gemoetry.jpg (11.0 KB, 15 views)
File Type: jpg 03_geometry_violation_screenhots.jpg (21.4 KB, 14 views)

Last edited by TKE; October 27, 2011 at 08:10. Reason: correction
TKE is offline   Reply With Quote

Reply

Tags
aspect number, icem cfd, projlib, surface

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
polynomial thermophysical properties II sebastian OpenFOAM Running, Solving & CFD 53 April 10, 2014 05:45
ParaView for OF-1.6-ext Chrisi1984 OpenFOAM Installation 0 December 31, 2010 07:42
error while running paraFoam! padmanathan OpenFOAM 9 October 13, 2009 05:17
attach/detach (valve opening/closing) phsieh2005 OpenFOAM Running, Solving & CFD 2 March 21, 2009 06:18
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19


All times are GMT -4. The time now is 13:24.