Thank you, Cyprien. I admire people who contribute to knowledge divulgation without expecting nothing in exchange. Your efforts are contributing to development of humanity. Many thanks.

I cannot thank you enough! These are the steps that I have been looking for being a beginner!!

mpirun -np 8 pisoFoam -parallel incase we are running the simulation on 8 cores in parallel and this needs decomposePar in systems folder. Thanks a lot for the insightful video!

Excellent video, Cyprien, you did it again!

This is amazing! Thank you very much Cyprien.

Thank you Sir. This tutorial has been very helpful. It helped me to understand better how to use Salome with OpenFoam

Thank you! ♥️👍 Weekend, CFD, chill... ☕🙂

@Cyprien Rusu Loved how you cover even the basic part of simulation. More Salome + OpenFOAM combo required..Thanks

Great video! Covers all the bases!

Thank you so much Cyprien, learned so many useful things, great content.

Thanks Cyprien, it is very informative tutorial video. In addition, I would like to add couple of things to this video:1- as you used wall model to emulate the fluid dynamics near the walls therefore checking Y+ is required. If Y+ is too big or too small you might end up either invalid wall model or unnecessary wall model in your calculations. 2- you might have found out why your simulation did not run faster when you used more processors, in case someone wants to know the reason, I would like to explain a bit more here, OpenFoam parallelization is done based on MPI, which means, we have to decompose the mesh into smaller size in order to assign each part of mesh to each processor. here is an example of running an application in parallel(after decomposing the mesh): mpirun -np 8 pisoFoam -parallel . If you want to run a simulation with multithreads you must check if your application is built or compiled with threading support.

about mpi, when your mesh is coarse, the data transfer between the processors can be slower, slower than computing the solution with just one processor, you will see significant change if you have more than a million cells. Also depends on number of processors, decomposition technique. For example my cfd takes less time with 24 processors than with 72 processors ( 9 million cells).

Great work Cyprien!

Great job, i was about to leave openfoam because i thought it was to complicate, but i think im got give it a new chance 🖒🖒🖒

very useful video, presented very neatly step by step

Thank you so much, very nice and helpful video!

thanx a lot Cyprien, I hope you make more videos about salome + openFoam.

Very good. Thank you so much. I learned a lot.

To use mpirun for this case, we have to prepare "decomposeParDict" under the system folder and modifiy the content (number of cores in use & mesh partition method). Then, run the following command: (1) decomposePar // Mesh partition for calculation (2) mpirun --np [n] pisoFoam -parallel // Designating the number core to use, and run in parallel [n]: [number of cores in use] (3) reconstructPar // Reconstruct the temporary processor folders (processor 0~n) (4) rm -r processor* // Discard all the temporary processor folders after reassembling all the temporary processor folders

Amazing video. Thank you very much!!!

Great video! Thank you!

Great video! Thanks a lot :)

This was great. Thank you so much.

Wonderful!!

Thank you so much, very great video

Thank you for this video, I like a lot.

Thanks its very helpful

Cyprien, thank you for the helpful videos. I have been trying to run an aircraft external flow simulation on OpenFOAM. I used the motorbike tutorial as a template, and have gotten results that I think are close. My issue is that I am having issues creating good quality inflation layers using snappyHexMesh. I've tried some other routes too, but getting good inflation layers was always the barrier to a good simulation. From watching Salome tutorials, it seems like it is easier to create good inflation layers compared to other meshing software. If you did a demo for an external flow aircraft that starts from importing a geometry (or surface mesh) and shows how to generate a far field and inflation layers, I (and I'm sure many other aerospace folks) would deeply appreciate it.

Great video. thanks

Hello, I think the problem with MPI is that you haven't partitioned the mesh: you are actually running 4 instances of the same sequential computation instead of a parallel computation, that's why it's taking longer (there is the overhead of the communication in top of the normal computing time).

Thank, very helful vedio

Hi, thank you very much. I learned a lot from this tutorial. I would also appreciate if you could do something similar focused on heat transfer.

Thank you for the great video. Salome-platform can also create this CAD file, I'm pretty sure. I was doing both simple CAD creation and tet-meshing with SP. It would be great if you could do hex meshing of this geometry!!

thanks!!!

Why did u use the value of the Pipe Turbulent Length Scale for the epsilon value ? Shouldn't you calculate also the epsilon value with the formula provided on Wikipedia ? thanks a lot Cyprien

I really congratulate you, but it could have been explained this well.

Thank you very much Cyprien!! are you planning new material? maybe coupling OpenFoam and Liggghts for beginners

that is great from you

Thanks for the great video! I was wondering, can turbulent flow in a pipe could also be solved using a simpleFoam solver instead of pisoFoam?

Gracias por compartir sus conocimientos. Saludos desde PERÚ. Usted cree que tendrá tiempo para hacer un tutorial sobre el modelamiento de una Barraje fijo y su poza disipadora con el programa SALOME Y OpenFOAM. Le agradecería bastante..

45:18 Cyprien, didnt you enter wrong number for epsilon by looking turbulent length scale?

It is possible to give openfoam a open frontier condition from a netcdf file? For example pilar in a river and river flow from another model with netcdf water velocities?

Hi. Not sure if you're aware, but the sixth video in your openfoam tutorials playlist seems out of place haha

hello i can seee you incres the viscous layer in the outer fluid part, it si possible to generate a viscous leyer near to the obstable? IF i want to analize with details this? how can i do it please'

obrigado

Hi. Thanks for the great video. I want to ask you a questions. Did you try openMP instead of mpi? I think it may be better on single processor with multi core.

Hi great video tutorial! May I ask at 45:15 why do you take the turbulence length scale as the initial value for epsilon? As i understand there is an equation where epsilon is calculated by the length scale and C(nu) and turbulence kinetic energy...

Hello Cyprien thanks for the tuto. Wouldn't have been better to run only the half of the model as it is symmetrical to save some simulation time, if yes how to do it?

Hi Cyprien, I could not find any complete course of OpenFoam in FEA for All's website. I have being looking for a course/training like this and I was not able to find any. I was wondering if you guys have a course like this. Thank you very much for you content!

Salut Cyprien ! Comment ça va en Chine ? Moi j'ai une petite question sur le solveur *chtMultiRegionFoam* si ça vous dérange pas. Idéalement je voudrais simuler un système de DCMD avec des flux incompressible, mais là dans ce solveur, les flux sont compressible. Comment puis-je le transformer à ce que j'attend ? Dois-je modifier le fichier .H ou .C du solveur (notamment avec le paramètre rho) ? Merci en avance pour votre réponse ! Bonne soirée :)

Thank you for the excellent video tutorial. In the OpenFOAM v10, I made the case be coincident with your case files with some non-orthogonality. However, I got the floating point error right after the calculation. Do you have any possible cause that makes it happen? Thank you again.

Thank you. I am wondering how to add units for the cylinder created by shaper of salome liker your step file with a mm unit? Any reply would be highly appreciated.

Great and helpful video. However, I had a lot of trouble getting the latest salome9.10 up and running. Have you tried installing that on a clean machine? I was a couple of days of work to figure out what was missing given that I am still only an intermediate Linux user. It looks like Salome had better install instructions in the past but not now.

Thank you . I need one help: When giving Explode, the following problem comes. what to do? Ubuntu 20.04. "GUI library corresponding to the user action can not be found or loaded"

Thanks very much Cyprein....I have a question Q......Aftet you meshed the innerflow (18:32), you create a group from geometry (and you emphasize that not from the "obstacle"...) Could you explain it why "obstacle" is excluded? Because the obstacle is not chosen, after you imoprt the mesh to OpenFoam, there is no boundary as "Obstacle". BUT!!! after you solved the mesh, the obstacle can be clearly seen in Paraview at the end of your video...

Hello Cyprien, good tutorials but I am missing a good and clear simulation tutorial of a centrifugal pump. i can send you a good geometry of a simple example. It can be a step or stl file.

Hello It is a very helpful video Thank you But when I add the residual function in the controldict this error comes up --> FOAM FATAL IO ERROR: (openfoam-2206) Unexpected '}' while reading dictionary entry file: system/controlDict at line 50. From static bool Foam::entry::New(Foam::dictionary&, Foam::Istream&, Foam::entry::inputMode, int) in file db/dictionary/entry/entryIO.C at line 156. FOAM exiting Please help

Very nice, Cyrpien! There is a possibility to simulate this same case in Code_Saturne (of course, not with that same level of details)? I will really appreciate! Thank you.

Hi Cyprien! How do i generate a STEP file?

Thanks Cyprien. I can run your simulation files on my machine.. but when trying to run my own i get "time step continuity errors : sum local = 2.84108e-08, global = 2.69594e-09, cumulative = -6.77675e-07" any advice? Thanks!

Thanks for this video! Unfortunately, I couldn't run the simulation because I got some errors. 1 - My mesh on Salome wasn't uniform, one side of walls was like yours and the other one was too fine. 2 - I took the same example than you, but my system directory came with lots of files like "FOadd, FOblendingFactor, FOdiv" and some other FOs hahaha. When I run the simulation, I got "time step continuity errors: sum local = 2.02142e+215, global = 4.06063e+198, cumulative = 1.21819e+199" I would be thanks if you could help me. Btw, one more time, thanks to share your knowledges with us.

Sir please can you tell me how we get mesh at any cross section in paraview openfoam???

If I wanted your services - do you do freelancing jobs?

this is why ANSYS charges a lot of money

hello cyprien! thanks for the videos! as always your tutorials are great! tetra meshes are not recommended but you have the polyDualMesh application that transforms a tetra mesh to a polyhedral one this could help a lot :) (www.openfoam.com/documentation/guides/latest/man/polyDualMesh.html) the only issue with this workflow is that it is not possible to parallel it (as neither the meshing with salome is multithreading and neither polydual...). normally, the new vr of salome 9.7 just went out and it should support this feature but for the moment I did not find how to do it.... if you play with that and you find it I am interested at least in a small text mail :)! the parallel execution, in minute 58:43 it is not correctly done, if you look at the header of the log you have nProc =1, thats because you used mpirun pisoFoam, it should be mpirun -np X pisoFoam -parallel (with X the number of domains) but you need to decompose your case previously to do parallel, (the division of the mesh in each domain that will be allocated in each processor). www.openfoam.com/documentation/guides/latest/man/decomposePar.html for this you need another dictionary in the system folder, decomposeParDict where you clarify the decomposition method etc etc.... in this geometry i would go with hierarchical. (if you need extra indications dont hesitate to send me an email) would love if you could make a video of doing an hexa dominant mesh with salome. like figure 6 in the boucher files.salome-platform.org/Salome/Common/Brochures/SALOME9-brochure.pdf best regards! franco

I am getting this error, while running foamMonitor. plot ^ "/tmp/tmp.B7Nsar" line 8: function to plot expected /opt/openfoam9/bin/foamMonitor: 211: kill: No such process arulhome@ubuntu:~/OpenFOAM/arulhome-9/RUN_My_Cases/InnerFLOW_cyprien-rusu/Turbulent_Flow_in_Pipe$