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Old   October 15, 2021, 21:40
Default Simulation of scour around a hydrokinetic turbine in river beds
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Thiago Vieira de Souza
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Greetings, Dr. Chauchat


I'm currently working on my master thesis investigating the effects of hydrokinetic turbines in live river beds.

The idea is to combine sedFoam with turbinesFoam so as to deploy the Actuator Line Method to represent the turbine at a low computational expense.

Unfortunately, I've been struggling with this case for quite a while. The effects of the turbine are not being computed at all throughout the simulations. Although I've imported the resources from turbinesFoam and all the files related to the turbine, I cannot seem the get the fvOptions right.

I don't really know how to include the source terms related to the turbine in order to compute the effect of energy extracted from the turbine to fluid in the near wake.

Are there any restrictions in sedfoam as to the use of fvOptions?
Is it really possible to combine the Actuator Line Method (turbinesFoam) with sedFoam as I'm trying to do?


I'd very much appreciate your response, professor. Thank you in advance!


Kind regards,
Thiago Vieira
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Old   October 16, 2021, 04:26
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Cyrille Bonamy
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Dear Tiago,


Are you using the latest version of sedFoam?


We have recently added and validated the fvOptions capabilities.


So i think you can test again, and i'm pretty sure it's possible to combine the actuator line with sedfoam.

Cyrille
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Old   October 16, 2021, 05:15
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Julien CHAUCHAT
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Dear Tiago,


As Cyrille said we have recently implemented and validated fvOption in sedFOAM so there is no technical problem to do what you want.

You may be interested by reading this article from French colleagues who coupled Actuator disk model and Blade Element Model with sedFoam :

https://doi.org/10.1016/j.ijsrc.2021.02.003


I also encourage you to contribute to sedFoam by sharing your development with the community.


Best regards,
Julien CHAUCHAT
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Old   October 17, 2021, 20:39
Default Scour around hydrokinetic turbine in live river beds
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Thiago Vieira de Souza
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Dear Dr. Chauchat and Cyrille,


Thank you for your response, I'll try and update sedfoam to its latest version and see if it works.
Also, I'll make sure to take a look at the article you recommended and share my progress with the community.


Regards,
Thiago Vieira
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Old   October 26, 2021, 21:10
Default Scour around hydrokinetic turbine in live river beds
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Thiago Vieira de Souza
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Dear Dr. Chauchat and Cyrille,

First of all, thank you for your help. I've updated sedFoam to its latest version, along with OpenFOAM-v2016 and it seems to be working perfectly. The fvOptions for the Actuator Line Method I'm trying to implement was read successfully.

Even though I can see the model being selected in the log file, my simulations are still illegible. The flow simply goes right past the region of the mesh where the turbine was supposed to be. Also, I'm getting empty files (only zeros) for the forces generated by the turbine as output at each time step.

Would you mind providing me with further assistance?

The fvOptions, controlDict and Ub files follow attached.
Below, the Actuator Line Method selection reads as follows in the log file:

Selecting finite volume options type axialFlowTurbineALSource
Source: turbine
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Source: turbine.blade1
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Source: turbine.blade2
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Source: turbine.blade3
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Frontal area of turbine: 0.636173
Source: turbine.hub
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Source: turbine.tower
- selecting cells using cellSet turbine
- selected 6174 cell(s) with volume 0.594442
Courant Number mean: 8.38152 max: 17.3442
Turbulence suspension term is included
Choice for faceMomentum : false

Starting time loop


Thanks in advance!
Attached Files
File Type: txt controlDict.txt (1.4 KB, 1 views)
File Type: txt Ub.txt (1.5 KB, 2 views)
File Type: txt fvOptions.txt (3.9 KB, 2 views)
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Old   December 8, 2021, 06:55
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Thokala Divya
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Hi,
I would like to do a similar apron scour problem for my case. Could you able to do it? Can I know which version of openfoam you have used? ESI or foundation? Which is the latest version you would suggest? I feel I can get some help from older versions because people have experiences? Can someone help me to get clarified in using latest version or old version.

Divya
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Old   December 10, 2021, 03:18
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we strongly suggest the latest version of openfoam.com (ESI)
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Old   May 7, 2022, 18:09
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Thokala Divya
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Quote:
Originally Posted by ajusree View Post
Sir,
I have been trying to modify the sedfoam code of scour downstream of an apron tutorial. I wanted to simulate a river flow in 3D with erodible boundaries. So I kept a rectangular box in blockMeshDict and I gave river geometry as my initial condition in funkySetFieldsDict. But the code got terminated after some time even without reaching 1 sec. When I checked the log file, I found an abrupt rise in the values of some of the variables.

Could you please give me some suggestions to correct this?


Can I know the tutorial name please. only one 3D scour problem is there I couldn't see the results properly
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Old   May 12, 2022, 15:19
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Cyrille Bonamy
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Quote:
Originally Posted by divyathokala01@gmail.com View Post
Can I know the tutorial name please. only one 3D scour problem is there I couldn't see the results properly
Indeed there is only one 3D tutorial. The case of @ajusree is a custom case i think, and @ajusree is not part of the sedfoam development team. So we don't have access to this simulation.
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Old   September 25, 2022, 04:23
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Jialin Pang
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Prof. Chauchat


I am a new openfoamer and I am trying to use sedfoam to simulate a realistic scour case. I have changed many boundary conditions and different input parameters, however, the horse shoe vortex didn't show up. With the same boundary condition and input parameters, the horse shoe vortex emerged in the pimpleFoam. Is there anything I need to take into account in a realistic case?



The parameters in the constant folder are copied from tutorials/3DScour.


Best regards,
Jialin
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Old   September 26, 2022, 13:52
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Julien CHAUCHAT
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Dear Jialin,


Most likely you used the default advection schemes (div schemes in system/fvSchemes) and temporal scheme (ddt) which are first order in the tutorial. You need to change to second order for both if you want to see the horseshoe vortex developing.



Best regards,
Julien Chauchat



Quote:
Originally Posted by jlpang View Post
Prof. Chauchat


I am a new openfoamer and I am trying to use sedfoam to simulate a realistic scour case. I have changed many boundary conditions and different input parameters, however, the horse shoe vortex didn't show up. With the same boundary condition and input parameters, the horse shoe vortex emerged in the pimpleFoam. Is there anything I need to take into account in a realistic case?



The parameters in the constant folder are copied from tutorials/3DScour.


Best regards,
Jialin
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Old   September 26, 2022, 21:56
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Jialin Pang
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Dear sir,
Thank you for the response. I will try to change the schemes and see if it works.


Best regards,
Jiali
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Old   October 4, 2022, 08:08
Default scour around the cylinder
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Jialin Pang
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Dear sir,
Thanks again for your useful suggestion, after I changed div schemes and ddt schemes to second order, the horseshoe vortex emerged. But when I check the scour around the cylinder, the alpha_a in paraview barely changed. It is not getting better after I refined the mesh. Could you please give me some suggestions to correct this?
Best regards,
Jialin
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