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-   -   Solidworks FLow Simulation - iterations?? (http://www.cfd-online.com/Forums/main/101869-solidworks-flow-simulation-iterations.html)

alpharays May 15, 2012 22:50

Solidworks FLow Simulation - iterations??
 
Hi All,

I'm using solidworks to do convection heat transfer in the microcomputer. The problem is my understanding on the number of iterations.

2 simulations are done through 2 different setting on the iteration:
1) goals convergence (result obtained as in Pic 1 attached - stop at iteration 56)
2) maximum iterations = 42 (result obtained as in Pic 2 attached - stop at iteration 42)

How do I explain about the differences of data ( in this case temperature) at iteration 20 and iteration 30??
For goals convergence; what is mean by goal convergence?? is it equilibrium state/ condition??

This number of iterations are not explained about time, am I right?

** for pics, please go to this post: https://forum.solidworks.com/thread/55629

Thanks

alpharays May 15, 2012 22:58

anyone who want to contact me.. please do so through skype..
my skype id is alpharays786..

thanks

evcelica May 16, 2012 10:28

It was still iterating your solution, at iteration 20 and 30 you do not have true solution yet. The simulation will stop whether when you have reached you convergence criteria (residual values) or when you reach the number of max iterations.

This is why I hate SolidWorks, its so easy to use that people who obviously know NOTHING at all about numerical methods can run CFD problems and make pretty pictures.

cdegroot May 17, 2012 00:25

Quote:

Originally Posted by evcelica (Post 361440)
It was still iterating your solution, at iteration 20 and 30 you do not have true solution yet. The simulation will stop whether when you have reached you convergence criteria (residual values) or when you reach the number of max iterations.

This is why I hate SolidWorks, its so easy to use that people who obviously know NOTHING at all about numerical methods can run CFD problems and make pretty pictures.

Absolutely! In my experience it is a pretty weak CFD tool to start with, made worse by the fact that it is so easy for the inexperienced user to input garbage and obtain a "solution".

chlp May 22, 2012 09:39

It's steady-state solutions with not-physical time steps (default). It is desirable to know in advance the approximate solution. Otherwise need to use time-depended solution.


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