Remove floating balls

PFC
#1

Dear all,

Does anyone know a fish code that can be used to remove floating balls in PFC2D?

Thanks,

Syani

#2

Dear Syani,

within the PFC documentation you can find the example called ā€œProbing a Granular Specimenā€.

Within the explenation of this example you can find the fish function called [identify_floaters] - you can delete the ball group called ā€˜floatersā€™ after calling the fish function.

Cheers

Mussie

#3

Dear Mussie,

Thanks to you I managed to find the function.

Let me ask you one more question, please. Do you know why a model never reaches convergence? Iā€™ve tried running the model for hours but the model wonā€™t converge.

Regards,

Syani

#4

Dear Syanai,

can you specify details of your models please.

What is the set up of your model? Did you use damping? Which solve commands did you use? Theres is a number of reasons why your model might not reach convergence.

Regards,

Mussie

#6

Dear Behzad,

You can use this code to delete the balls that donā€™t have any contacts.

fish define identify_floaters
loop foreach local ball ball.list
ball.group.remove(ball,ā€˜floatersā€™)
local contactmap = ball.contactmap(ball)
local size = map.size(contactmap)
if size <= 1 then
ball.group(ball) = ā€˜floatersā€™
endif
endloop
end
[identify_floaters]
ball delete range group ā€˜floatersā€™

When you run that code, there will be information about how much they delete the balls.

Regards,

Syani

Pada tanggal Kam, 4 Agu 2022 pukul 02.08 Behzad via Itasca Software Forum <notifications@itasca.discoursemail.com> menulis:

2 Likes
#7

Thank you so much Syani. It helped me truly!