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Generating sediment bed and scouring simulation |
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June 29, 2023, 21:17 |
Generating sediment bed and scouring simulation
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#1 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Dear Sir,
I am a beginner. I have run simulations for plane-bed for flow around different piers. I need guidance for generating sediment bed and simulating the scour around the pier. Also, How can I generate bed profile using experimental scour data to get hydrodynamics over equilibrium scoured bed? Looking forward to suggestions. Thanks |
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July 5, 2023, 14:00 |
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#2 |
New Member
Ronja
Join Date: Dec 2021
Posts: 16
Rep Power: 6 |
Hi Chitrangini,
You can find the sediment options in the Guide in Chapter 2.12 S :: Sediment. When using Sediment options, the sediment topography is determined in a similar way like the water-air interface, except that you will make a contour (in paraview) with topo=0 instead of phi=0. The bed topography for your start of the simulation can be defined by several options depending on what kind of sediment bed form you need at t = 0: 1. in ctrl.txt: with the option S 57 - one value in z-direction for the whole domain) 2. in control.txt (DIVEMesh): T :: Topo - regular topography 3. in control.txt (DIVEMesh): G :: Geodat similar to a solid - irregular topo (you can look up Tutorial 9.12 for how to use the geo.dat) Hope that helps for further steps of your scour simulation. |
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July 5, 2023, 23:11 |
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#3 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Thanks for your response Ronja.
So, in geo.dat file, I can give all the experimental coordinates I obtained after the equilibrium scour and input this file for simulation to generate my scoured bed profile. Is that correct? Can you please share any sample control and ctrl files if possible? |
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July 6, 2023, 11:21 |
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#4 |
New Member
Ronja
Join Date: Dec 2021
Posts: 16
Rep Power: 6 |
Since you said you already simulated hydrodynamics around piers, you could add sediment options to this as a start.
For simulating with an irregular topography (either erodible = topo or non-erodible = solid) you can use a geo.dat file with the coordinates and use DIVEMesh for the interpolation (you can look up Tutorial 9.12 for how to use the geo.dat) Or if you do not need an erodible bed, but only an irregular topography, you can also use an .stl-file. (See option S 1 1) I would suggest, you give it a try Come back if you encounter difficulties you cannot solve. |
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July 6, 2023, 11:37 |
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#5 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Thanks for the help. I will try running few sample simulations.
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September 10, 2023, 02:49 |
Generating sediment bed and scouring simulation
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#6 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Hi team,
Here are the ctrl and control files I am using to create the sediment bed and scouring simulation for a single circular pier under the current flow. I have tried to simulate the scour over a rectangular sand bed from zero time. May I request you help me validate if the input files look correct? Also, please guide to visualize the scouring results on Paraview. Last edited by @Chitrangini; September 10, 2023 at 03:25. Reason: Removed one question as I got the answer |
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September 10, 2023, 02:57 |
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#7 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
This image shows the velocity contour and free surface. I am doubtful about the contour. Can you please check the input file for any possible errors?
A high velocity value has occurred at the start point of the investigation area. Is there a way to resolve this? |
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September 10, 2023, 16:50 |
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#8 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Can you please let me know the reason why the vertical line before the pier is coming in all my simulations? Also, I can see pixels throughout the contour. Is there a way to smoothen those pixels?
Looking forward to your response to the above doubts as well. Thanks |
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September 11, 2023, 17:12 |
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#9 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Hi Chitrangini,
please have a look at chapter 5 of the REEF3D User Guide for the description on how to visualize the REEF3D results within Paraview. Also have a look at the Paraview documentation for more in-depth information. |
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September 12, 2023, 09:37 |
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#10 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Hi Prof. Bihs,
Thanks for the response. I am not able to find any instructions for the scour plotting. I tried to run the simulation for 18 hours approximately using the attached input files. Can you please have a look and suggest the corrections, if any are required? Attached are the input files. Please have a look. |
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September 12, 2023, 11:21 |
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#11 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
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For showing the scour, you need to create a contour in Paraview and "contour by" topo with the value 0.
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September 13, 2023, 16:28 |
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#12 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Hi Prof. Bihs,
I tried to visualize the topo as per your instruction in the above comment. But I am getting the result as attached. Both at t=0 and t=2986 it is showing zero value throughout the sediment bed. Paraview is not showing any scour. May I request your guidance if I am doing something wrong? Attaching the ctrl and control files as well. Can you please have a look at the input files and suggest corrections? |
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September 14, 2023, 10:19 |
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#13 |
New Member
Ronja
Join Date: Dec 2021
Posts: 16
Rep Power: 6 |
Examples for what to do to double check simulations:
- check your hydrodynamics first (simulation without sediment module), are water levels/velocities etc correct - check the bed shear stress values from the model & compare with the critical bed shear stress to see if your setup generates scour - you could have a setup where you make sure you get scour just to get familiar with the topo -> e.g. decrease the crit shields - use other bed shear stress formulations is t = 2986sec the hydrodynamic or morphodynamic time? Is that the time you expect scour? Be aware that these are decoupled, see options in REEF3D Guide: S 14 and S 15 |
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September 15, 2023, 13:02 |
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#14 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Thanks for the suggestions Ronja. I will check all my inputs as you suggested.
I have another doubt. Can you please tell me how can I generate a surface with geo.dat data as bed topo? Which command is to be used for creating a surface with geo.dat input data? |
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September 15, 2023, 13:03 |
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#15 |
New Member
Chitrangini S
Join Date: Jun 2023
Location: Mumbai, India
Posts: 13
Rep Power: 3 |
Thanks for the suggestions Ronja. I will check all my inputs as you suggested.
I have another doubt. Can you please tell me how can I generate a surface with geo.dat data as bed topo? Which command is to be used for creating a surface with geo.dat input data? |
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April 8, 2024, 21:26 |
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#16 |
New Member
全国
Join Date: Apr 2022
Posts: 11
Rep Power: 4 |
You can use other tools like Matlab
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Tags |
hydrodynamic model, reef3d cfd, sediment scour |
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