MESSAGE ID : 205 ** RUN KILLED: ENERGY ERROR LIMIT REACHED

NoorAlam_08
NoorAlam_08 Altair Community Member
edited August 2021 in Community Q&A

Hello everyone,

i am running non linear explicit problem during the solving kinetic energy getting very high and due to this  simulation getting killed.

i am not able to understand why energy increasing because i am running the simulation without any warning or error but simulation got killed. outfile is attached here for detailed 

the detailed message in below please advise the solution.

 

 

 

 

MESSAGE ID : 205

** RUN KILLED: ENERGY ERROR LIMIT REACHED

6337 0.1453E-02 0.6476E-08 INTER 2 99.9% 0.2715E+07 0.5781E+27 0.000 0.3373E+07 0.2441E+20
ANIMATION FILE: z101_2.7MMA002 WRITTEN

** STATISTICS **

*** PARTS WITH HIGHEST KINETIC ENERGY

PART_ID K-ENERGY PROP_ID PROP_TYPE MAT_ID MAT_TYPE
6 0.2897E+06 7 14 6 42
8 0.1919E+06 3 1 8 1
9 0.1144E+06 4 1 9 1
4 0.2094E+05 5 14 4 42
5 9751. 6 14 5 42
7 5332. 2 1 7 1
4017 2791. 10 14 4002 36
3001 721.0 8 14 3001 1
4040 18.59 9 14 4001 36
4029 0.9344 11 14 4003 36

*** PARTS WITH HIGHEST INTERNAL ENERGY

PART_ID I-ENERGY PROP_ID PROP_TYPE MAT_ID MAT_TYPE
8 0.2141E+07 3 1 8 1
7 0.3058E+06 2 1 7 1
6 0.1901E+06 7 14 6 42
9 0.5582E+05 4 1 9 1
4 0.1150E+05 5 14 4 42
4017 7658. 10 14 4002 36
5 3450. 6 14 5 42
3001 89.28 8 14 3001 1
4040 30.51 9 14 4001 36
4029 5.670 11 14 4003 36

*** NODES WITH HIGHEST VELOCITY

NODE VELOCITY K-ENER MASS MASS0 DM/MASS0
841243 0.2997E+05 37.44 0.8336E-07 0.8336E-07 0.000
841291 0.2970E+05 114.9 0.2604E-06 0.8363E-07 2.113
837586 0.2964E+05 143.4 0.3263E-06 0.8362E-07 2.902
837642 0.2935E+05 86.55 0.2010E-06 0.8365E-07 1.403
837527 0.2904E+05 71.18 0.1689E-06 0.8372E-07 1.017
837718 0.2895E+05 588.3 0.1404E-05 0.8373E-07 15.76
841367 0.2886E+05 34.69 0.8328E-07 0.8328E-07 0.000
841347 0.2883E+05 34.76 0.8366E-07 0.8366E-07 0.000
837673 0.2878E+05 101.7 0.2457E-06 0.8339E-07 1.946
836746 0.2873E+05 34.86 0.8444E-07 0.8444E-07 0.000

*** NODES WITH HIGHEST MASS CHANGE

NODE MASS MASS0 DM/MASS0
849652 0.9001E+19 0.7091E-07 0.1269E+27
550781 0.4231E+19 0.5493E-07 0.7703E+26
550671 0.2520E+19 0.5486E-07 0.4594E+26
550782 0.1980E+19 0.5508E-07 0.3595E+26
550674 0.2694E+18 0.5505E-07 0.4894E+25
849763 0.5229E+09 0.7054E-07 0.7412E+16
572508 0.2462E+09 0.5467E-07 0.4503E+16
572397 0.1438E+09 0.5454E-07 0.2636E+16
572509 0.1177E+09 0.5472E-07 0.2150E+16
572400 0.1525E+08 0.5460E-07 0.2792E+15

 

 

 

 

regards,

Noor Alam

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited August 2021

    if you use a fixed timestep, then the solver will try to add mass to certain nodes to keep the timestep fixed.

    If you loook at your out file, it shows these nodes addind a loooooot of mass.

    Usually this is related to some extreme distortions in your mesh, where the characteristic length of the element is getting too small, thus the timetep goes very low, forcing the solver to increase the mass to compensate and then the kin energy rises too.

    Take a look at these nodes below at this particular timestep, and try to figure out why are they being so distorted.

    It there is excessive distortion you might need to add some control over it, maybe adding some failure model, or some other way to remove this element from the model.

     

    *** NODES WITH HIGHEST MASS CHANGE

    NODE MASS MASS0 DM/MASS0
    849652 0.9001E+19 0.7091E-07 0.1269E+27
    550781 0.4231E+19 0.5493E-07 0.7703E+26
    550671 0.2520E+19 0.5486E-07 0.4594E+26
    550782 0.1980E+19 0.5508E-07 0.3595E+26
    550674 0.2694E+18 0.5505E-07 0.4894E+25
    849763 0.5229E+09 0.7054E-07 0.7412E+16
    572508 0.2462E+09 0.5467E-07 0.4503E+16
    572397 0.1438E+09 0.5454E-07 0.2636E+16
    572509 0.1177E+09 0.5472E-07 0.2150E+16
    572400 0.1525E+08 0.5460E-07 0.2792E+15

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