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Step Size Settings for Optistruct

seyilmaz

Hello,

I have a non-linear quasi-static analysis. I want my model to start with 0.01 increment (finishes at 1 so the total number of steps will be 100) and continue this way. I do not want Optistruct to automatically adjust increment.

I set NINC in NLPARM 100.

How can I set step size to be constant throughout solution?

I know this is so basic. Thank you in advance.

Regards,

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Rahul Rajan_21763

Use PARAM,EXPERTNL,NO

Altair Forum User

Hello,

I have a non-linear quasi-static analysis. I want my model to start with 0.01 increment (finishes at 1 so the total number of steps will be 100) and continue this way. I do not want Optistruct to automatically adjust increment.

I set NINC in NLPARM 100.

How can I set step size to be constant throughout solution?

I know this is so basic. Thank you in advance.

Regards,

Do you mean time increment?

Is it a small displacement analysis or large displacement analysis?

If it is a large displacement analysis, please use NLADAPT and DIRECT to YES. This uses fixed time increment. In case of divergence, the run will stop immediately.

seyilmaz

Hello,

Thnak you for your answers.

I meant constant time increment. But it seems like both NLADAPT and EXPERTNL will do what I want.

Regards,