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Re: [Question #703901]: whats the difference between “GlobalStiffnessTimeStepper”and "O.dt"

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From: mikexue <question703901@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Nov 2022 12:45:32 -0000
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Question #703901 on Yade changed:
https://answers.launchpad.net/yade/+question/703901

mikexue posted a new comment:
 Hi, Jan.
Thank you for your answer. I find that "O.dt=SafetyCoefficient*utils.PWaveTimeStep() " is also commonly used in the Yade documentation. 

Here is another question related to dt:
Besides the fact that GlobalStiffnessTimeStepper is dynamic and utils.PWaveTimeStep() is fixed, should they be of the same value at the very beginning of the simulation?  
I mean dt="GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=10,timestepSafetyCoefficient=0.8) "equals to dt="0.8*utils.PWaveTimeStep()" at the beginning of the simulation? 
I am confused coz I tried these two ways and they are different in my simulation.

best,
yong

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