Optistruct Choosing Direct and Iterative Process Solving ?

Joel Rodarte

Hello,

 

Is there a way I can have control over how I want the model to be solved? Between Iterative and Direct Method?

 

Can I have control on sparsity matrix?

 

Thank you for your time!

 

Simon Križnik

Hi,

 

SOLVTYP defines the solver type to be used for static and dynamic analysis. Load collector>SOLVTYP card image --> Load Step>SOLVTYPE (subcase option).

Unable to find an attachment - read this blog

Joel Rodarte

Hello Simon,

 

Thank you for your quick anwer,

 

I did some research and saw on Altair Documentation that both Linear and Nonlinear models are solved by Direct Methods,

                Boeing Solver for linear static and MUMPS solver for nonlinear static,

 

My understanding, and what I see on my .out file, is that nonlinear models are solved iteratively instead of direct as documentation suggests; So, my next questions are:

 

1) NonLinear quasiStatic  is solved in an iterative or direct method?

2) What does the documentation mean that  the default solver for non linear static uses a direct solver?

 

Thank you!

          

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FaroukM

Altair Forum User said:

Hello Simon,

 

Thank you for your quick anwer,

 

I did some research and saw on Altair Documentation that both Linear and Nonlinear models are solved by Direct Methods,

                Boeing Solver for linear static and MUMPS solver for nonlinear static,

 

My understanding, and what I see on my .out file, is that nonlinear models are solved iteratively instead of direct as documentation suggests; So, my next questions are:

 

1) NonLinear quasiStatic  is solved in an iterative or direct method?

2) What does the documentation mean that  the default solver for non linear static uses a direct solver?

 

Thank you!

          

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Hi Joel,

 

I answered you in your last post.

 

Cheers,