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

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From: mikexue <question703901@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 23 Nov 2022 04:05:40 -0000
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New question #703901 on Yade:
https://answers.launchpad.net/yade/+question/703901

Hi，

My simulation is about a rotating rod inserted into a chamber that contains about 470,000 particles.
When I use "GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=10,timestepSafetyCoefficient=0.8)", I get a dynamic dt around 3.64e-6. 
The program proceeded with a speed of 3 iter/s. It takes a long time to run the whole simulation.
For some reasons I want to set a fixed dt to calculate the position.
I wonder if I can set the dt equals to maybe 4e-6 or 1e-5 or even a larger dt to save some time?
Would it affect the stability or the data such as the contact force between the particles?

I appreciate your help,
Mikexue

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