Using the newly implemented feature of embedding FORTRAN type expressions in LS-DYNA using the *PARAMETER_EXPRESSION keyword, it is becoming easier to develop analysis templates that can provide flexible ways of changing analysis settings. A partial input file highlighting the possibilities is shown below, and the full file is available here: main.k. Using this as a template, one can import any model (prior to defining *CONTROL and *DATABASE keywords) and run the desired analysis. Parameter names used in the *PARAMETER_EXPRESSION card can be carefully chosen to reflect the names of the keywords in which they are used. LS-DYNA outputs the computed parameter values into the D3HSP file so they can be extracted and directly embedded for future runs if desired.
*KEYWORD
*PARAMETER_EXPRESSION
I ascfreq 1000000000
I binfreq 1000000000
I coarsen 2
I crspsid 913
I d3itctl 2
R tdybir 0
R tdybur stg2+(stg3-stg2)/10
R tdydth stg2
R term stg3
R tirep 0.248
...
*CONTROL_COARSEN
&coarsen;,&crsang;,0,&crspsid;
*CONTROL_CONTACT
,&rwpnal;
,,&rwgaps;,1e20,&rwksf;
*CONTROL_DYNAMIC_RELAXATION
,,,&stg3;,,,,&idrflag;
*CONTROL_HOURGLASS
&hg;,0.05
*CONTROL_IMPLICIT_AUTO
&iauto;,&iteopt;,&itewin;,&dtmin;,&dtmaxc;
*CONTROL_IMPLICIT_DYNAMICS
&imass;,γ,β,&tdybir;,&tdydth;,&tdybur;,&irate;
*CONTROL_IMPLICIT_EIGENVALUE
&neigv;
&isolid;,&ibeam;,&ishell;,&itshell;
*CONTROL_IMPLICIT_GENERAL
&imflag;,&dt0;
*CONTROL_IMPLICIT_SOLUTION
&nsolvr;,&ilimit;,&maxref;
,,,1,0,&d3itctl;
*CONTROL_TERMINATION
&term;
*CONTROL_TIMESTEP
,,,,&dt2ms;
*CONTROL_OUTPUT
1,3,,,,,,&iflush;
*DATABASE_BINARY_D3DUMP
&dtdump;
*DATABASE_BINARY_D3PLOT
&dtbin;
*DATABASE_GLSTAT
&dtasc;
*DATABASE_MATSUM
&dtasc;
*DATABASE_NODOUT
&dtasc;
...
*DEFINE_CURVE
10000,&drflag;
0.0,0.0
&stg1;,0.0
&stg2;,1.0
&term;,1.0
*LOAD_BODY_Z
10000,9810.0
*END
