CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > REEF3D

Scour around a cylindrical monopile

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

Like Tree3Likes
  • 2 Post By valgrinda
  • 1 Post By Ronja

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 20, 2023, 19:33
Default Scour around a cylindrical monopile
  #1
New Member
 
Dimitri Sirianos
Join Date: Jul 2023
Posts: 7
Rep Power: 2
dsir99 is on a distinguished road
Hi everyone,

I am modelling scour around a cylindrical monopile but I am unable to get the scouring at the upstream end of the monopile. I expect horseshoe vortices to form at the bottom of the monopile, transporting the sediment. Downstream I am getting roughly what I am expecting.

I am not sure whether this is due to the meshing not fine enough to capture the scouring at the upstream end of the monopile or if there is something wrong with something within my input files. I have attached my control and ctrl files.

Thanks!
Attached Files
File Type: txt control.txt (217 Bytes, 23 views)
File Type: txt ctrl.txt (394 Bytes, 24 views)
dsir99 is offline   Reply With Quote

Old   September 21, 2023, 01:48
Default
  #2
Super Moderator
 
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 386
Rep Power: 18
valgrinda is on a distinguished road
Could you upload the result for the scour pattern?
__________________
Hans Bihs
Team REEF3D
www.reef3d.com
valgrinda is offline   Reply With Quote

Old   September 22, 2023, 20:52
Default
  #3
New Member
 
Dimitri Sirianos
Join Date: Jul 2023
Posts: 7
Rep Power: 2
dsir99 is on a distinguished road
Quote:
Originally Posted by valgrinda View Post
Could you upload the result for the scour pattern?
Here a screenshot
Attached Images
File Type: png Screenshot 2023-09-23 at 10.49.37 am.png (139.4 KB, 66 views)
dsir99 is offline   Reply With Quote

Old   September 23, 2023, 05:08
Default
  #4
Super Moderator
 
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 386
Rep Power: 18
valgrinda is on a distinguished road
Ah ok. It looks like you are not using the sandslide algorithm. That needs to be turned on for scour calculations.
Gang Wang and dsir99 like this.
__________________
Hans Bihs
Team REEF3D
www.reef3d.com
valgrinda is offline   Reply With Quote

Old   September 24, 2023, 21:25
Default
  #5
New Member
 
Dimitri Sirianos
Join Date: Jul 2023
Posts: 7
Rep Power: 2
dsir99 is on a distinguished road
Quote:
Originally Posted by valgrinda View Post
Ah ok. It looks like you are not using the sandslide algorithm. That needs to be turned on for scour calculations.
Which sandslide algorithm would you recommend?
dsir99 is offline   Reply With Quote

Old   September 26, 2023, 04:03
Default
  #6
New Member
 
Ronja
Join Date: Dec 2021
Posts: 16
Rep Power: 6
Ronja is on a distinguished road
I would suggest S 90 2.
dsir99 likes this.
__________________
Ronja
Team REEF3D
www.reef3d.com
Ronja is offline   Reply With Quote

Old   October 3, 2023, 05:35
Default
  #7
New Member
 
Dimitri Sirianos
Join Date: Jul 2023
Posts: 7
Rep Power: 2
dsir99 is on a distinguished road
Quote:
Originally Posted by valgrinda View Post
Ah ok. It looks like you are not using the sandslide algorithm. That needs to be turned on for scour calculations.
Hi, I have added a sandslide algorithm and have increased the number of sandslide iterations to 1000 and it hasn't made a difference.

Would you have any other suggestions?
dsir99 is offline   Reply With Quote

Old   October 3, 2023, 06:33
Default
  #8
New Member
 
Ronja
Join Date: Dec 2021
Posts: 16
Rep Power: 6
Ronja is on a distinguished road
I suggest you check your mesh if you haven't done so yet. Check the control.txt and put the relevant definitions only. So far I saw that B 101 is called twice and some other parameter definitions might not be needed? Also I see you are reading in a geo.dat (G 10 1)?

Look at our mesh in paraview after generating it to decide if you need to refine the mesh. Check also if the hydrodynamics (especially around the cylinder) are represented as needed, especially before the sediment algorithm starts.
Try a uniform cell size maybe, your domain is not very big.
__________________
Ronja
Team REEF3D
www.reef3d.com
Ronja is offline   Reply With Quote

Old   October 10, 2023, 20:49
Default
  #9
New Member
 
Dimitri Sirianos
Join Date: Jul 2023
Posts: 7
Rep Power: 2
dsir99 is on a distinguished road
Quote:
Originally Posted by Ronja View Post
I suggest you check your mesh if you haven't done so yet. Check the control.txt and put the relevant definitions only. So far I saw that B 101 is called twice and some other parameter definitions might not be needed? Also I see you are reading in a geo.dat (G 10 1)?

Look at our mesh in paraview after generating it to decide if you need to refine the mesh. Check also if the hydrodynamics (especially around the cylinder) are represented as needed, especially before the sediment algorithm starts.
Try a uniform cell size maybe, your domain is not very big.
What kind of things would you recommend me looking at for the hydrodynamics and the sediment algorithm? I have been playing around with it and still have not had any success.
dsir99 is offline   Reply With Quote

Reply

Tags
cylinder scour, meshing, scour, sediment transport

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
Finite Volume Method For Cylindrical Coordinates falopsy Main CFD Forum 45 August 14, 2023 21:14
Numericalmethod of fluid flow in the cylindrical coordinate ulfaazmi Main CFD Forum 0 July 5, 2018 22:21
[General] Drawing a cylindrical object for viewing in Paraview jeosol ParaView 1 May 23, 2017 03:08
How to improve the lateral propagation of scour hole (3D) sycst911 FLOW-3D 2 April 29, 2014 22:07
Scour around vertical cylinder pyxbird FLOW-3D 5 December 25, 2013 02:28


All times are GMT -4. The time now is 07:55.