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Alter for "NOAP" Restarts in Modal Transient Analysis
 

Alter Name     mtranrr.v707


Purpose

To allow "NOAP" restarts in the Structured Solution Sequences.


Solution Sequence

SOL 112.


Input
 
File Management Section

Restart, version = xx, keep

or

Restart, version = xx, nokeep

where xx = the version in the database to restart from.
 
Executive Control

Include 'mtranrr.v707'.
 
Case Control

Standard Case Control for the direct transient analysis.
 
Bulk Data

PARAM,NOAP,yy

where yy =  3*timestep + 1  (For example to restart from the
tenth timestep, NOAP is set equal to 3*10+1=31.)

New TSTEP (if desired) and TLOADx.  The program restarts
with the selected time step as an initial condition and begins
using that point as time 0.0.  This means that the input loading
and TSTEP need to be modified to reflect this.


Output

Standard output for the transient analysis.


Limitations

On the restart run, the solution at the selected time step in the original
solution is used as an initial condition and the analysis begins with
that as the solution at time t = 0.0.  This means that the TSTEP and
loading entries may need to be modified.  The printed output starts at
the restart time step.  (This is labeled as time 0.0.)

In the program, the restart logic supports only coupled analysis not the
uncoupled analysis that is normally associated with modal transient
solutions.  Therefore, the program performs a direct (coupled) solution
using the modal equations starting at the restart time step.


Sample Files

mtranr1.dat   Transient analysis of a cantilever beam.

mtranr2.dat   Restart from the 20th time step in mtranr1.


Additional Documentation

MSC/NASTRAN User's Manual, Version 65, Section 3.1.3.