NLADAPT DIRECT=yes is not used in my case ?

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!

cfuser

Hi Young,

could you also share your NLPARM entry, please?

young

Altair Forum User said:

Hi Young,

could you also share your NLPARM entry, please?

hi cfuser，my NLparm entry likes this， 

FaroukM

Altair Forum User said:

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

 

 

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) : 

 

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, 

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"?>

 

Please keep me in touch.

young

Altair Forum User said:

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"?>

 

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

Simon Križnik

Hi,

 

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

young

Altair Forum User 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.

 

Simon Križnik

The increment can be fixed using either:

• DTmax=DTmin 
• PARAM>EXPERTNL>NO

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

young

Altair Forum User 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.