Bezier Extraction trouble with *IGA_2D_BEZIER

Bezier Extraction trouble with *IGA_2D_BEZIER_XYZ

- July 26, 2025 at 12:46 am
  
  sdotero
  Subscriber
  
  I keep running into the same error when I try and do bezier extraction on my spline surface. The error is "forrtl: severe (174): SIGSEGV, segmentation fault occurred". I can get successful runs with a regular unstructured spline setup, but when I try and do a new unstructured spline surface that required adding in additional control points around each EP I get the aforementioned error. I have tried comparing the formatting of the files and I cannot find where the difference is. I am working on the most basic layout possible with 3 elements to help the debugging.
- July 28, 2025 at 11:07 am
  
  Ram Gopisetti
  Ansys Employee
  
  Hi,
  Please paste the complete error traceback for better suggestions.
  Also, try the latest versions of LS-Dyna to see if this is a bug or a model setup issue.
  Cheers, Ram
- July 29, 2025 at 9:07 pm
  
  sdotero
  Subscriber
  
  License option : check ansys licenses only
  
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  Date: 07/25/2025 Time: 19:17:10
  ___________________________________________________
  | |
  | LS-DYNA, A Program for Nonlinear Dynamic |
  | Analysis of Structures in Three Dimensions |
  | Date : 08/15/2022 Time: 08:09:41 |
  | Version : smp d DEV |
  | Revision: DEV-95269-g5232bb932d |
  | |
  | Features enabled in this version: |
  | Shared Memory Parallel |
  | CESE CHEMISTRY EM ICFD STOCHASTIC_PARTICLES |
  | FFTW (multi-dimensional FFTW Library) |
  | ARPACK (nonsymmetric eigensolver library) |
  | ANSYSLIC enabled |
  | |
  | Platform : Xeon64 System |
  | OS Level : Linux 2.6.32 uum |
  | Compiler : Intel Fortran Compiler 19.0 SSE2 |
  | Hostname : m8-17-3 |
  | Precision : Double precision (I8R8) |
  | |
  | Unauthorized use infringes Ansys, Inc. copyrights|
  |___________________________________________________|
  
  > i=triangle_ac1.k memory=8000M ncpu=8
  Messages file /ansys_inc/shared_files/licensing/language/en-us/ansysli_msgs.xml does not exist.
  LS-DYNA CPU Licenses Requested: 8 Available: 8
  
  Executing with ANSYS license
  
  Command line options: i=triangle_ac1.k
  memory=8000M
  ncpu=8
  
  Input file: triangle_ac1.k
  
  The native file format : 64-bit small endian
  Memory size from command line: 8000000000
  
  on UNIX computers note the following change:
  
  ctrl-c interrupts ls-dyna and prompts for a sense switch.
  type the desired sense switch: sw1., sw2., etc. to continue
  the execution. ls-dyna will respond as explained in the users manual
  
  type response
  ----- ------------------------------------------------------------
  quit ls-dyna terminates.
  stop ls-dyna terminates.
  sw1. a restart file is written and ls-dyna terminates.
  sw2. ls-dyna responds with time and cycle numbers.
  sw3. a restart file is written and ls-dyna continues calculations.
  sw4. a plot state is written and ls-dyna continues calculations.
  sw5. ls-dyna enters interactive graphics phase.
  swa. ls-dyna flushes all output i/o buffers.
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  swc. a restart and dynain are written and ls-dyna continues calculations.
  swd. a restart and dynain are written and ls-dyna terminates.
  swe. stop dynamic relaxation just as though convergence
  endtime=time change the termination time
  lpri toggle implicit lin. alg. solver output on/off.
  nlpr toggle implicit nonlinear solver output on/off.
  iter toggle implicit output to d3iter database on/off.
  prof output timing data to messag and continue.
  conv force implicit nonlinear convergence for current time step.
  ttrm terminate implicit time step, reduce time step, retry time step.
  rtrm terminate implicit at end of current time step.
  
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  Beginning of keyword reader 07/25/25 19:17:14
  
  Memory required to process keyword : 179616
  Additional dynamic memory required : 2102558
  
  forrtl: severe (174): SIGSEGV, segmentation fault occurred
  Image PC Routine Line Source
  ls-dyna_smp_d_DEV 0000000017E9F273 Unknown Unknown Unknown
  libc.so.6 00007FAB1979D6F0 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000018044E2F Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 000000001804594C Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000017ED2D20 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 000000000045577D dynamem_mp_lsmall 257 dynamem.f90
  ls-dyna_smp_d_DEV 0000000002E96013 dynai_ 7847 dynai.f
  ls-dyna_smp_d_DEV 00000000034C3DE6 overly_ 596 overly.f
  ls-dyna_smp_d_DEV 000000000043D219 lsinput_ 517 lsinput.f
  ls-dyna_smp_d_DEV 000000000043AD5B MAIN__ 1553 lsdyna.f
  ls-dyna_smp_d_DEV 0000000000419432 Unknown Unknown Unknown
  libc.so.6 00007FAB19788590 Unknown Unknown Unknown
  libc.so.6 00007FAB19788640 __libc_start_main Unknown Unknown
  ls-dyna_smp_d_DEV 0000000000419345 Unknown Unknown Unknown
  forrtl: severe (174): SIGSEGV, segmentation fault occurred
  Image PC Routine Line Source
  ls-dyna_smp_d_DEV 0000000017E9F319 Unknown Unknown Unknown
  libc.so.6 00007FAB1979D6F0 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000018042629 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 00000000180424C7 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000018042212 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000018042A0D Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000017FFBE34 Unknown Unknown Unknown
  libc.so.6 00007FAB1979FDED Unknown Unknown Unknown
  libc.so.6 00007FAB1979FF30 on_exit Unknown Unknown
  ls-dyna_smp_d_DEV 0000000017E930E1 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000017E9F273 Unknown Unknown Unknown
  libc.so.6 00007FAB1979D6F0 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000018044E2F Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 000000001804594C Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 0000000017ED2D20 Unknown Unknown Unknown
  ls-dyna_smp_d_DEV 000000000045577D dynamem_mp_lsmall 257 dynamem.f90
  ls-dyna_smp_d_DEV 0000000002E96013 dynai_ 7847 dynai.f
  ls-dyna_smp_d_DEV 00000000034C3DE6 overly_ 596 overly.f
  ls-dyna_smp_d_DEV 000000000043D219 lsinput_ 517 lsinput.f
  ls-dyna_smp_d_DEV 000000000043AD5B MAIN__ 1553 lsdyna.f
  ls-dyna_smp_d_DEV 0000000000419432 Unknown Unknown Unknown
  libc.so.6 00007FAB19788590 Unknown Unknown Unknown
  libc.so.6 00007FAB19788640 __libc_start_main Unknown Unknown
  ls-dyna_smp_d_DEV 0000000000419345 Unknown Unknown Unknown
- July 29, 2025 at 9:08 pm
  
  sdotero
  Subscriber
  
  I can also provide my .k files if that would be helpful.