Yade

globUpdate in PeriTriaxController

Asked by jamespaul

Hi,

In PeriTriaxController,one parameter is globUpdate，

globUpdate(=5)
How often to recompute average stress, stiffness and unbalaced force.

The default is 5. Does that mean it analyze stress, stiffness and unbalaced force every 5 steps?

James

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Jérôme Duriez
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Jérôme Duriez (jduriez) said : 		#1

Exactly:

https://gitlab.com/yade-dev/trunk/blob/master/pkg/dem/PeriIsoCompressor.cpp#L153

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jamespaul (jamespauljames) said : 		#2

Thanks Jérôme，

>bool doUpdate((scene->iter%globUpdate)==0);
 if(doUpdate || min(stiff[0],min(stiff[1],stiff[2])) <=0 || dynCell){ strainStressStiffUpdate(); }

For this code, my understanding is that the smaller the doUpdate, the more accurate it is.If I take 1, it's going to make a judgment at every step.

Is my understanding correct?

James

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Best Jérôme Duriez (jduriez) said : 		#3

Yes, it is.

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jamespaul (jamespauljames) said : 		#4

Thanks Jérôme Duriez, that solved my question.

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Bruno Chareyre (bruno-chareyre) said : 		#5

>Does that mean it analyze stress, stiffness and unbalaced force every 5 steps?

No.
Stress is updated at every step anyway as soon as dynCell=True (your case).

Bruno