# Solidworks FLow Simulation - iterations??

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 May 15, 2012, 22:50 Solidworks FLow Simulation - iterations?? #1 New Member   shahrul Join Date: Oct 2010 Location: Malaysia Posts: 24 Rep Power: 15 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

 May 15, 2012, 22:58 #2 New Member   shahrul Join Date: Oct 2010 Location: Malaysia Posts: 24 Rep Power: 15 anyone who want to contact me.. please do so through skype.. my skype id is alpharays786.. thanks

 May 16, 2012, 10:28 #3 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,171 Rep Power: 23 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. sail and cdegroot like this.

May 17, 2012, 00:25
#4
Senior Member

Chris DeGroot
Join Date: Nov 2011
Posts: 414
Rep Power: 17
Quote:
 Originally Posted by evcelica 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".

 May 22, 2012, 09:39 #5 New Member   Eugeny Join Date: Feb 2011 Location: Ukraine Posts: 9 Rep Power: 15 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.

 Tags flow simulation, heat transfer, iterations, simulation, solidworks