CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Speed up calculation time DEM

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By jeroendemto

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 2, 2018, 05:17
Question Speed up calculation time DEM
  #1
New Member
 
Join Date: Sep 2018
Posts: 25
Rep Power: 6
jeroendemto is on a distinguished road
Hey everyone!

I'm trying to simulate particles with a size of 3*10^-5 diameter and a youngh's modulus of 2 Gpa. They flow through a tube filled with liquid. The amount of particles I try to simulate are around 20,000. The velocity magnitude is not that high, around 0.3 m/s. The time step I use for the rest of the calculations is 10^-3s.

All this combined makes my calculations really slow because of the substepping. Will increasing the substepping time influence my calculations much?

I thought the program takes a really small substepping time because of the rayleigh wave speed. However, my particles don't interact much with eachother, only sometimes with the wall. Which would mean increasing the substepping time manually does not influence my calculations much?

I hope I gave enough information, if I did not feel free to ask.

kind regards,
Jeroen
TommyM likes this.
jeroendemto is offline   Reply With Quote

Old   October 14, 2022, 15:58
Default Any solutions?
  #2
New Member
 
Cassian
Join Date: May 2022
Posts: 5
Rep Power: 2
Cassian is on a distinguished road
Hello I know its years later, but has anyone found any solutions or tips to increase the DEM simulation speed (other than decreasing the Young's modulus)?
Cassian is offline   Reply With Quote

Old   November 16, 2022, 09:20
Default
  #3
New Member
 
Valparaiso
Join Date: Dec 2019
Posts: 3
Rep Power: 4
Bovy is on a distinguished road
The interactons are important, for example play whit normal spring stiffness if it is too small the particle go trow the wall like a phantom and change the sub step times.... use the more simple model and then try to change for other.

or try to use hertz mindlin and the only variable important is the young moduls ....

the "mesh" of the geometry is important more triangles more interactions more time... in meshless too
Bovy is offline   Reply With Quote

Reply

Tags
calculation time, dem

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Elastic or Plastic Deformations in OpenFOAM NickolasPl OpenFOAM Pre-Processing 31 November 22, 2021 10:26
AMI speed performance danny123 OpenFOAM 21 October 24, 2020 05:13
LES, Courant Number, Crash, Sudden Alhasan OpenFOAM Running, Solving & CFD 5 November 22, 2019 03:05
Micro Scale Pore, icoFoam gooya_kabir OpenFOAM Running, Solving & CFD 2 November 2, 2013 14:58
dynamic Mesh is faster than MRF???? sharonyue OpenFOAM Running, Solving & CFD 14 August 26, 2013 08:47


All times are GMT -4. The time now is 06:20.