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Nastran error-Too many restarts

Nastran error-Too many restarts

Nastran error-Too many restarts

(OP)
Hi,
I am getting the nastran error message
"SYSTEM FATAL MESSAGE 6724 (SB11RD)
 TOO MANY RESTARTS."

I have no idea on how to continue,Please help.

Bharat
 

RE: Nastran error-Too many restarts

29311              Iterative Solver - SITDR2, SOLVIT, ITER -  UFM 6724 (SB1RM)

The iterative solver may fail with the message:

               USER INFORMATION MESSAGE 6447 (SITDR2)
               ITERATIVE SOLVER DIAGNOSTIC OUTPUT

               EPS :  1.00000E-06
               BICWELL PRECONDITIONING

              USER FATAL MESSAGE 6724 (SB1RM)
              TOO MANY RESTARTS.
               USER ACTION: INCREASE IPAD VALUE ON BULK DATA CARD ITER.

          0FATAL ERROR

Avoidance:  This message may be caused by a negative term on the factor
diagonal..  A potential cause for getting a negative diag. term is that  the
matrix is ill-conditioned.  The error may be avoided by  increasing the IPAD
parameter on the ITER entry.  Another possibility is- to use BICILL instead of
BICWELL.



Hope it helps

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