Learning Forum

[Joey Richardson]

I am trying to save the nodal forces of a DYNA simulation and can't get the NODFOR file to generate. My card deck is below. Does anyone know what is going on here? Thanks!

$ LS-DYNA Keyword file created by fem.dyna Python functions
$ Created on 05:53PM on July 24, 2023
*KEYWORD
*CONTROL_ENERGY
$ hgen, rwen, slnten, rylen
2,2,2,2
*CONTROL_MPP_IO_NOFULL
*CONTROL_TERMINATION
$ endtim, endcyc, dtmin, endeng, endmas
0.0045,0,0.0,0.0,0.0
*CONTROL_TIMESTEP
$ dtinit, tssfac, isdo, tslimt, dt2ms, lctm, erode, ms1st
1e-06,0.02,0,0.0,0.0,1,0,0
*DATABASE_NODOUT
$ dt, binary, lcur, ioopt, option1, option2
2e-05,0,0,1,0.0,0
*DATABASE_NODFOR
$ dt, binary, lcur, ioopt, option1, option2
1e-06,0,0,1,0.0,0
*DATABASE_EXTENT_BINARY
$ neiph, neips, maxint, strflg, sigflg, epsflg, rltflg, engflg
0,0,3,0,2,2,2,1
$ cmpflg, ieverp, beamip, dcomp, shge, stssz, n3thdt, ialemat
0,0,0,4,1,1,2,0
*DATABASE_FORMAT
$ iform, ibinary
0,1
*DATABASE_HISTORY_NODE_SET
$ id1, id2, id3, id4, id5, id6, id7, id8
1,0,0,0,0,0,0,0
*SET_NODE_GENERAL
1
ALL
*PART
$ Title
background
$ pid, secid, mid, eosid, hgid, grav, adpopt, tmid
1,1,1,0,0,0,0,0
*SECTION_SOLID
$ secid, elform, aet
1,2,0
*PART
$ Title
background pml
$ pid, secid, mid, eosid, hgid, grav, adpopt, tmid
2,2,2,0,0,0,0,0
*SECTION_SOLID
$ secid, elform, aet
2,2,0
*INCLUDE
../../nodes.dyn
*INCLUDE
../../elems.dyn
*INCLUDE
../NodalLoads.dyn
*INCLUDE
Materials.dyn
*INCLUDE
LoadCurves.dyn
*END

[Ushnish Basu]

You have to use DATABASE_NODAL_FORCE_GROUP

[Joey Richardson]

I tried adding this card: 

*DATABASE_NODAL_FORCE_GROUP
1,1

And got the following error:

 *** Error 10146 (KEY+146)
     coordinate set id 1 is undefined
     CHECKING NODAL FORCE GROUPS

 

Do I need to setup some sort of coordinate set to be able to save forces? I don't think this has been necessary to save nodal displacements. Is there an example to see how to set this up/how to save forces?

[Ushnish Basu]

If you don't have a coordinate system ID, then no need to specify one in that card, just specify the node set

[Joey Richardson]

That worked! Thank you

[Joey Richardson]

Spoke too soon... The nodfor file was created, but it is empty. 

Here is how I am creating my database and node sets. Do you have any suggestions on why the nodfor file would be empty?

*DATABASE_NODOUT
$ dt, binary, lcur, ioopt, option1, option2
2e-05,0,0,1,0.0,0
*DATABASE_NODFOR
$ dt, binary, lcur, ioopt, option1, option2
1e-06,0,0,1,0.0,0
*DATABASE_NODAL_FORCE_GROUP
1
*DATABASE_EXTENT_BINARY
$ neiph, neips, maxint, strflg, sigflg, epsflg, rltflg, engflg
0,0,3,0,2,2,2,1
$ cmpflg, ieverp, beamip, dcomp, shge, stssz, n3thdt, ialemat
0,0,0,4,1,1,2,0
*DATABASE_FORMAT
$ iform, ibinary
0,1
*DATABASE_HISTORY_NODE_SET
$ id1, id2, id3, id4, id5, id6, id7, id8
1,0,0,0,0,0,0,0
*SET_NODE_GENERAL
1
ALL

[Ushnish Basu]

Unfortunately, we cannot comment on any specific case in this forum

[Joey Richardson]

Is there any contact or support package for help with specific cases?

[Ushnish Basu]

You can get in touch with your Ansys contact (likely the account manager) and ask them if you can be provided more personalised help.

Regards,

Ushnish