minCollisionDeltaT in PairSpringSliderDashpot.C

lilinmin · April 11, 2016, 04:07

dear,
I am now confused with the function of minCollisionDeltaT in PairSpringSliderDashpot.C
I want to find the primary theory, can anyone help me ?
Linmin

K.C. · June 3, 2022, 06:12

Would be very interesting for me too.
The formula does not look like an empircial correlation, but I wonder about the strange exponents

Code:

    // Note:  pi^(7/5)*(5/4)^(2/5) = 5.429675
    scalar minCollisionDeltaT =
        5.429675
       *rMin
       *pow(rhoMax/(Estar_[maxEstarIndex_]*sqrt(UMagMax) + vSmall), 0.4)
       /collisionResolutionSteps_;

The orriginal source would be nice.

In addition I would like to learn more about the "collisionResolutionSteps_"
A value of 12 is used in the hopper tutorial, but is that a general advice?

Thanks for any reply.

Shah Akib Sarwar · February 13, 2023, 19:58

Did anyone ever find an answer to these questions? I am currently stuck on this topic!

April 11, 2016, 04:07	minCollisionDeltaT in PairSpringSliderDashpot.C	#1
lilinmin New Member Li Linmin Join Date: Nov 2015 Location: China Posts: 27 Rep Power: 11	dear, I am now confused with the function of minCollisionDeltaT in PairSpringSliderDashpot.C I want to find the primary theory, can anyone help me ? Linmin

June 3, 2022, 06:12		#2
K.C. Member Join Date: Mar 2015 Posts: 36 Rep Power: 11	Would be very interesting for me too. The formula does not look like an empircial correlation, but I wonder about the strange exponents Code: // Note: pi^(7/5)(5/4)^(2/5) = 5.429675 scalar minCollisionDeltaT = 5.429675 rMin pow(rhoMax/(Estar_[maxEstarIndex_]sqrt(UMagMax) + vSmall), 0.4) /collisionResolutionSteps_; The orriginal source would be nice. In addition I would like to learn more about the "collisionResolutionSteps_" A value of 12 is used in the hopper tutorial, but is that a general advice? Thanks for any reply.

February 13, 2023, 19:58		#3
Shah Akib Sarwar Member Shah Akib Sarwar Join Date: Mar 2021 Posts: 41 Rep Power: 5	Did anyone ever find an answer to these questions? I am currently stuck on this topic!