random result or error

Svenja Potthast
Svenja Potthast Altair Community Member
edited May 2023 in Community Q&A

Hello Altair Team,

I have created a model for front crash calculation in radioss in Hyperworks version 2019. in version 2019 this can be calculated.

now i can use the version 2022.
as soon as I load the model here, seemingly random things happen.
sometimes i get error -messages or warnings quite fast. from this i get no calculation results. on a next try, hyperworks makes 1 or 2 restarts and then the model can be calculated. 
what can be the reason for this seemingly random results.

( in the attachement: the .rad files and one example of an "error"- output file)

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Answers

  • Mathis
    Mathis
    Altair Employee
    edited May 2023

    Hi Svenja,

    On my side, I have no issue with version 2022.3. Maybe you should try with the latest version?

    By the way, your model is quite nice. I would just advise you the following changes:
    - in the /PROP/SHELL, set Iplas=1 & Ithick=1
    - you can position your RWALL closer to your structure 
    - you can replace all your contacts by a single auto-contact with all the parts. you can use Igap=3 to automatically setup the gap value according to the thicknesses of your parts.

    Regards,

    Mathis

  • Svenja Potthast
    Svenja Potthast Altair Community Member
    edited May 2023
    Mathis Loverini_20748 said:

    Hi Svenja,

    On my side, I have no issue with version 2022.3. Maybe you should try with the latest version?

    By the way, your model is quite nice. I would just advise you the following changes:
    - in the /PROP/SHELL, set Iplas=1 & Ithick=1
    - you can position your RWALL closer to your structure 
    - you can replace all your contacts by a single auto-contact with all the parts. you can use Igap=3 to automatically setup the gap value according to the thicknesses of your parts.

    Regards,

    Mathis

    thank you for this feedback and the hints to improve my model.
    i can now reproducibly get a result after exporting the model from version 2019 and then importing it again in version 2022. i have not made any changes yet.
    a few questions about this:
    how can i (to your point nr 3[replace by a single auto- contact]) then split the Components cleverly into Surfpart and GmodPart for my Interfaces? I have found the igap setting option.
    and to your point nr 1 (/PROP/SHELL, set Iplas=1 & Ithick=1): is it then useful to implement this for all cards?

    Thank you for your helpful feedback.

  • Svenja Potthast
    Svenja Potthast Altair Community Member
    edited May 2023

    Hello together,

    i am struggeling with my Frontcrash model in Hyperworks radioss. 

    The Solver faild with the massage: ** RUN KILLED: TOTAL MASS ERROR LIMIT REACHED

    I wantet to enlarge my model by "adding" a new part and meshed it. I do not understand what I forgot in the settings. bevore the extension of my model, the simulation run.  the listed warnings have been there bevore, but it worked out. in the attachement i will add my *.rad and *.out file.

    I hope somebody can help me with my problem(s).

    .. UNITS SYSTEM
     .. CONTROL VARIABLES
     .. STARTER RUNNING ON    1 THREAD
     .. MATERIALS
     .. NODES
     .. PROPERTIES
     .. 3D SHELL ELEMENTS
     .. 3D TRIANGULAR SHELL ELEMENTS
     .. SUBSETS
     .. BOX
     .. ELEMENT GROUPS
     .. PART GROUPS
     .. SURFACES
     .. NODE GROUP
    WARNING ID :    692
    ** WARNING IN SURFACE DEFINITION
    WARNING ID :    690
    ** WARNING IN NODE GROUP DEFINITION
     .. BOUNDARY CONDITIONS
     .. INITIAL VELOCITIES
     .. DOMAIN DECOMPOSITION
     .. ELEMENT GROUPS
     .. INTERFACES
     .. INTERFACE BUFFER INITIALIZATION
     .. RIGID WALLS
     .. RIGID BODIES
     .. RETURNS TO DOMAIN DECOMPOSITION FOR OPTIMIZATION
     .. DOMAIN DECOMPOSITION
     .. ELEMENT GROUPS
     .. INTERFACES
     .. INTERFACE BUFFER INITIALIZATION
    WARNING ID :    343
    ** WARNING: INITIAL PENETRATIONS IN INTERFACE
     .. RIGID WALLS
     .. RIGID BODIES
     .. ELEMENT BUFFER INITIALIZATION
    WARNING ID :    312
    ** INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL
    DESCRIPTION :
        3516 INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL
     .. GEOMETRY PLOT FILE
     .. PARALLEL RESTART FILES GENERATION

  • Svenja Potthast
    Svenja Potthast Altair Community Member
    edited May 2023
    Mathis Loverini_20748 said:

    Hi Svenja,

    On my side, I have no issue with version 2022.3. Maybe you should try with the latest version?

    By the way, your model is quite nice. I would just advise you the following changes:
    - in the /PROP/SHELL, set Iplas=1 & Ithick=1
    - you can position your RWALL closer to your structure 
    - you can replace all your contacts by a single auto-contact with all the parts. you can use Igap=3 to automatically setup the gap value according to the thicknesses of your parts.

    Regards,

    Mathis

    Hi Mathis,

    thank you for these hints. I think I implemented them quiet good. it worked out. now i tried to enlarge my model as you see in the massage below, but got new problems here...

    Regards Svenja

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