$
$     THIS ALTER IS CONFIDENTIAL AND A TRADE SECRET OF THE 
$     MSC.SOFTWARE CORP.  THE RECEIPT OR POSSESSION OF
$     THIS ALTER DOES NOT CONVEY ANY RIGHTS TO REPRODUCE OR
$     DISCLOSE ITS CONTENTS, OR TO MANUFACTURE, USE, OR SELL
$     ANYTHING HEREIN, IN WHOLE OR IN PART, WITHOUT THE 
$     SPECIFIC WRITTEN CONSENT OF THE MSC.SOFTWARE CORPORATION.                                
$

Alter for "NOAP" Restarts in Direct Transient Analysis


Alter Name      dtranrr.v707


Purpose

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


Solution Sequence

SOL 109.


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 'dtranrr.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 time step, NOAP would be 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 to
use 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).


Sample Files

dtranr1.dat   Direct transient analysis of a cantilever beam.

dtranr2.dat   Restart from the 20th time step in dtranr1.


Additional Documentation

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