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+--- Thread: Maximum Iterations question (/showthread.php?tid=1097)
Maximum Iterations question - feresteanud - 11-23-2010
Hi,
I am not pretty sure if I have really understood the use of Maximum Iterations.
So this is what I understood: the faster the object the bigger value should be for Maximum Iterations and if the object has no movement then the value could be smaller. Is this right?
Thank you
Re: Maximum Iterations question - sitnisati - 11-23-2010
Hello,
It's not related to object size, but rather to grid dimensions and velocities in it.
The easiest way to set up the solver is to set Quality to around 4 and leave maximum iterations to 200 or more. This way the solver will always finish when solution error falls below level defined by the Quality parameter.
Kresimir
Re: Maximum Iterations question - FabianB - 11-23-2010
feresteanud Wrote:Hi,
I am not pretty sure if I have really understood the use of Maximum Iterations.
So this is what I understood: the faster the object the bigger value should be for Maximum Iterations and if the object has no movement then the value could be smaller. Is this right?
Thank you
Hey feresteanud,
I think you are confusing Maximum Iterations with Simulation Steps!
If you have a lot of velocity in your sim, fast movement, you should increase your simulation steps! And to build up on Kresmirs explanation, now with the CFL Condition it works pretty much the same as Quality and Maximum Iterations. Simulation Steps = Maximum Iterations, CFL Condition = Quality.
Re: Maximum Iterations question - feresteanud - 11-24-2010
Thank you both very much for your answers.
Re: Maximum Iterations question - jrand - 11-25-2010
Quality is still quality
Quote:Simulation Steps = Maximum Iterations, CFL Condition = Quality
Well in sense it does
The CFL condition determines how many simulation sub-steps to use at any given time during a sim (as long as you have more than 1 sim sub-step). So if you set your simulation sub-steps to 10 and the CFL settings determines that your channel data (fire, smoke, temp, velocity) has exceeded the set value from one voxel to the next it will start adding sub-steps, when the channel data drops back below the set value it will turn off or lower the sub-step. It is a wicked cool implementation.
You should pretty much now consider 3+ the default simulation step setting. If the sim needs them it will use them if it doesn't it won't.
Re: Maximum Iterations question - FabianB - 11-25-2010
That's what I was trying to say with my school english.
Both the simulation steps and the maximum iterations work as limiting value (maximum value) whereby Quality and the CFL Condition determine, depending on their settings, how many to use.
Re: Maximum Iterations question - feresteanud - 11-25-2010
Awesome guys. Thanks a lot.