Modifying EIGRL card entries for SOL103 using MFLUID

[mashst24]

Hello,

I am running a normal modes analysis for a cylindrical water tank using a MFLUID fluid region to simulate water in the tank. Because I am modeling the tank when it is full of water, I have the top, bottom and cylindrical faces selected for the fluid region and the z-free surface option turned OFF. When I analyze the model I get the following fatal error:

*** SYSTEM FATAL MESSAGE 5407 (LNCCKS)
INERTIA (STURM SEQUENCE) COUNT DISAGREES WITH THE NUMBER OF MODES ACTUALLY COMPUTED IN A (PARTIAL) INTERVAL
FOUND 6 MODES BETWEEN 1.0000000E+02 AND 1.3160740E+02 HZ BUT THERE SHOULD BE ONLY 4 MODES.
THIS RUN IS TERMINATED. PARAM, BAILOUT, -1 MAY BE USED TO CONTINUE THE RUN.

USER ACTION: THE FOLLOWING CHANGES TO THE EIGRL CARD MAY HELP TO SOLVE THIS PROBLEM

1. INCREASE MAXSET​

2. IF F1 IS GIVEN AS ZERO, LEAVE IT BLANK.​

3. IF F1 AND F2 ARE BOTH GIVEN, LEAVE F2 BLANK AND SPECIFY A VALUE FOR ND​

I've been modifying the range of interest and number of desired modes in the NASTRAN Modal Analysis section of the Analysis Set Manager for my SOL103 analysis, but no luck so far. I also don't seem to be able to leave either the F1 or F2 field blank as suggested in the error message. If I remove the value, it reverts to the default value of zero. Any suggestions for modifying my entries to get my analysis to run? Thanks very much.

 

[Naffoussi]

Hi,

Did you try to run a FREE-FREE analysis? this will help you to find the error. You can define for example 50 modes.
don't hesitate to use the PARAM,BAILOUT,-1 card. This will also help you to visualize the error. Don't forget to uncheck it after resolving the problem.

Hope this helps.