Learning Forum

[lorenzo.esposito2]

Dear all,

 

I am doing a Direct Steady State Dynamic (SSD) analysis with LS-DYNA on a very simple but high density meshed shell structure. Regarding the main keyword, I have followed the ANSYS example template as from https://lsdyna.ansys.com/example-08-04/#keywords, but with some modifications to adapt to my specific case.

 

Unfortunately, when I run the simulation, I get this error:

computing ssd for freq number:       1   freq =  1.0000E+01

error in function _checkInput, at line 260, in file ../..//lcpack.v6/LCPACK/src/computeUD.c
status of GD = 0, must be 4
error -2 in function LCPACK_computeUD, at line 68, in file ../..//lcpack.v6/LCPACK/src/computeUD.c
error -2 in function LCPACK_compute, at line 65, in file ../..//lcpack.v6/LCPACK/src/compute.c
error -2 in function LCP_COMPUTE, at line 955, in file ../..//lcpack.v6/LCPACK/src/fortran_interface.c
*** Error 60011 (IMP+11)

*************************************************************
*                                                                                   *
*                       -  FATAL ERROR  -                             *
*                                                                                   *
*  Error in using LCPACK in routine map_LCP_dyna  *
*                             irc    =      -2                                   *
*          lcp_op =LCP_compute for UD                         *
*                                                                                    *
*       Please check file spooles.res for further info.      *
*                                                                                    *
**************************************************************

Could you please help me identify the possible error sources?

Thanks in advance.

 

Kind regards, 

Lorenzo

[igandiko]

This looks like a memory issue. What version of ls-dyna are you running? Please try a newer version or the latest dev build. 

[lorenzo.esposito2]

Thank you for your response.

 

I am running the 2024 R2, so I do not think the problem is related to the software version.

 

However, I have sort of solved the problem (or at least it no longer appears in the log as the simulation is nominally running) by removing the boundary condition related keyword from the model. I had two edges clamped. To implement the BCs I used the *BOUNDARY_SPC_SET keyword as I used to do in explicit simulations.

 

- Is this keyword compatible with *FREQUENCY_DOMAIN_SSD_DIRECT simulation? 

- Could this be the source of the error?

- Is there any other way to implement a BCs?

Kind regards,
Lorenzo

[igandiko]

though 2024R2 is the latest Ansys release, the dyna version may not be the latest. You are probably running R14 ls-dyna (you can check messag file for confirmation). R15 is the latest version. 

Boundary_spc card should be okay but as you said, the mesh is dense so maybe there is some sort of memory leak using this card. You can also use boundary_presc_motion and apply 0 displacement to fix the nodes.