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NLADAPT DIRECT=yes is not used in my case ?

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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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6 minutes ago, cfuser said:

Hi Young,

could you also share your NLPARM entry, please?

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

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On 10/24/2019 at 6:46 AM, young said:

hi cfuser,my NLparm entry likes this, 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, 

Edited by Farouk Maaboudallah
Tabulation problem

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On 10/26/2019 at 3:27 AM, Farouk Maaboudallah said:

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

 

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:

aa.fem

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1 hour ago, Hyperman said:

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.

 

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12 hours ago, Hyperman said:

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.

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