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NLADAPT DIRECT=yes is not used in my case ?

User: "young"
Altair Community Member
Updated by young

Hi,everybody,

    I need to fix time increment in my load step , have set NLADAPT>DIRECT>YES,and referece this load  in my loadstep. But the solver seems to ignore it and keeps increasing the incerement size.Can somebody give me an advice on what I could do to solve this issue? Thank you very much!

image.png.88b987160432193c23e2e48cd693b6f6.pngimage.png.1758196dcd50ca8353325d44773bedf6.pngimage.png.466fa66d6fb29329e9ade7bf469b17b0.png

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    User: "cfuser"
    Altair Community Member
    Updated by cfuser

    Hi Young,

    could you also share your NLPARM entry, please?

    User: "young"
    Altair Community Member
    OP
    Updated by young

    Hi Young,

    could you also share your NLPARM entry, please?

    hi cfuser,my NLparm entry likes this, image.png.1697760998fff3026b70f7672f1026b2.png

    User: "FaroukM"
    Altair Community Member
    Updated by FaroukM

    hi cfuser,my NLparm entry likes this, <?xml version="1.0" encoding="UTF-8"?>image.png.1697760998fff3026b70f7672f1026b2.png

     

     

    Hi Young, 

     

    It's weird. I ran a non linear static simulation (frictional contact model). I used this configuration (for NLADAPT,  NLOUT and NLPARM respectively)

    image.png.21524420b13f2d1bc21c6b7eb3266411.pngimage.png.55b0e8a70bbf6a74291d3effe7a0e176.pngimage.png.2cc1f93a85ca9b781bc9c1e7912832ab.png

     

    and It worked well ...

     

    If it's not confidential, can you please share your model or verify the time increment story in simple model than you can share it ?

     

    Best regards, 

    User: "FaroukM"
    Altair Community Member
    Updated by FaroukM

    To be sure : I repeated the same simulation. Instead of using 0.1 I used 0.05 and it worked well ... 

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.989751b5c6a4c5f57373c22bcb53dad8.png

     

    Please keep me in touch.

    User: "young"
    Altair Community Member
    OP
    Updated by young

    To be sure : I repeated the same simulation. Instead of using 0.1 I used 0.05 and it worked well ... 

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.989751b5c6a4c5f57373c22bcb53dad8.png

     

    Please keep me in touch.

    Hi,

        Thank you for your reply, I tried the configuration as you said, but it  not works very well,still keeps increasing the incerement size.I try a simple case likes this:

    Unable to find an attachment - read this blog

    User: "Simon Križnik"
    Altair Community Member
    Updated by Simon Križnik

    Hi,

     

    Increment adjustment is automatic by default PARAM>EXPERTNL>AUTO. Try with PARAM>EXPERTNL>NO instead.

    User: "young"
    Altair Community Member
    OP
    Updated by young

    Hi,

     

    Increment adjustment is automatic by default PARAM>EXPERTNL>AUTO. Try with PARAM>EXPERTNL>NO instead.

    Hi,hyperman,

           I have tried this setting as you said,it worked well, the increment size is fixed.Thank you very much.

         But, in other case ,I haven't keep expernel>no, just be sure the DTmax equals to DTmin, the increment can be fixed, so 8s this setting( PARAM>EXPERTNL>NO) only necessary in some cases? 

           Looking forward your reply.

     
    User: "Simon Križnik"
    Altair Community Member
    Updated by Simon Križnik

    The increment can be fixed using either:

    • DTmax=DTmin 
    • PARAM>EXPERTNL>NO

    However NLADAPT>DIRECT>YES does not work for some reason. 

    User: "young"
    Altair Community Member
    OP
    Updated by young

    The increment can be fixed using either:

    • DTmax=DTmin 
    • PARAM>EXPERTNL>NO

    However NLADAPT>DIRECT>YES does not work for some reason. 

    Thank you very much.