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Showing results 1 to 25 of 1375 Search took 0.05 seconds. Search: Posts Made By: sbaffini

Forum: Main CFD Forum Today, 07:47

Replies: 6 Motivation and introduction for learning assembly coding Views: 178 Posted By sbaffini I don't want to spoil this thread with additional... I don't want to spoil this thread with additional personal consideration (instead, I invite you to keep it rolling with everything you feel useful to us in order to understand the matter), but: ...

Forum: Main CFD Forum Today, 06:06

Replies: 6 Motivation and introduction for learning assembly coding Views: 178 Posted By sbaffini Just a disclaimer for myself... of course, if I... Just a disclaimer for myself... of course, if I could, I would like to be good at everything (yet, probably, assembly would still not make it into the top 5 in this case). But healthy time and brain...

Forum: Main CFD Forum Yesterday, 15:43

Replies: 7 gfortran couldn't even vectorize a simple 2D matrix addition Views: 252 Posted By sbaffini Not related directly, but intel now provides... Not related directly, but intel now provides oneapi, which is free (https://www.scivision.dev/intel-oneapi-fortran-install/)

Forum: Main CFD Forum January 11, 2021, 08:41

Replies: 9 Performance/Useability problem in my C++ matrix library Views: 169 Posted By sbaffini Ok, maybe I misunderstood what you were after. I... Ok, maybe I misunderstood what you were after. I tought you were trying to find a way to randomly access an nd-dimensional array.

Forum: Main CFD Forum January 11, 2021, 08:04

Replies: 9 Performance/Useability problem in my C++ matrix library Views: 169 Posted By sbaffini Honestly, I don't know how you could otherwise... Honestly, I don't know how you could otherwise randomly access any array if not trough sub2ind. I mean, that's the required math... you can do it in special registers or memory locations, but that's...

Forum: Main CFD Forum January 11, 2021, 06:51

Replies: 9 Performance/Useability problem in my C++ matrix library Views: 169 Posted By sbaffini You know, I'm just playing the devil's advocate... You know, I'm just playing the devil's advocate here. You seem quite into that, you will ventually find out without our help. However, I'm still of the opinion that you should first try to have a...

Forum: Main CFD Forum January 11, 2021, 06:07

Replies: 9 Performance/Useability problem in my C++ matrix library Views: 169 Posted By sbaffini I'll supersede a lot of philosophical issues and... I'll supersede a lot of philosophical issues and just ask: if you want to use C++ for this (while Fortran would have been probably more suited), why don't you just use a library (not written by you)?...

Forum: Main CFD Forum January 11, 2021, 05:39

Replies: 9 channel flow LES, no slip, velocity not zero in paraview Views: 330 Posted By sbaffini Just to be clear, I didn't want to say that you... Just to be clear, I didn't want to say that you were wrong. Actually, I'm pretty sure that this is exactly what happened to you. I just wanted to say that, sometimes, some behaviors are not...

Forum: Main CFD Forum January 10, 2021, 11:06

Replies: 18 Why use high order schemes? Views: 315 Posted By sbaffini Going back to the original question, may I ask... Going back to the original question, may I ask what has been the development cost of your HO implementation (with respect to the 2nd order one) and do you perceive its maintainment as an added cost...

Forum: Main CFD Forum January 10, 2021, 10:39

Replies: 18 Why use high order schemes? Views: 315 Posted By sbaffini I think the most honest answer here is really the... I think the most honest answer here is really the one provided by Filippo above (the first one). But let me digress a little further. The mesh size is not always an ideal measure of the costs you...

Forum: Main CFD Forum January 10, 2021, 10:07

Replies: 8 CFD code for studies on wall roughness Views: 205 Posted By sbaffini Speaking of the devil, I just saw this tool: ... Speaking of the devil, I just saw this tool: https://github.com/fschuch/xcompact3d_toolbox https://xcompact3d-toolbox.readthedocs.io/en/latest/ Maybe this is going to be useful for you

Forum: Main CFD Forum January 10, 2021, 09:20

Replies: 18 Why use high order schemes? Views: 315 Posted By sbaffini So, to answer your question, a typical measure... So, to answer your question, a typical measure (which, however, I think is overinflated) is the number of required grid points for a given accuracy, when compared to low order codes.

Forum: Main CFD Forum January 10, 2021, 09:15

Replies: 18 Why use high order schemes? Views: 315 Posted By sbaffini The doubt is, indeed, legit, but the reason is... The doubt is, indeed, legit, but the reason is quite obvious when you think about it. The primary reason is for applications where that accuracy is mandatory. Have you ever made the 1d experiment...

Forum: Main CFD Forum January 9, 2021, 10:14

Replies: 9 channel flow LES, no slip, velocity not zero in paraview Views: 330 Posted By sbaffini Not to bother you again, but this is indeed not a... Not to bother you again, but this is indeed not a bug in Paraview, at least not in the common sense of a general Paraview bug. There are few aspects worth mentioning to clarify this, also for anyone...

Forum: Main CFD Forum January 7, 2021, 18:18

Replies: 3 Future of conventional CFD now that AI based CFD is here? Views: 250 Posted By sbaffini However, there is another point of view here,... However, there is another point of view here, which is related to the market, the software vendors. One thing that I find, to say the least, peculiar of the CFD software business (and probably...

Forum: Main CFD Forum January 7, 2021, 15:01

Replies: 8 CFD code for studies on wall roughness Views: 205 Posted By sbaffini Nek is certainly well documented and getting... Nek is certainly well documented and getting better. As a personal perception I would say yes, easier to get acquainted to from a user perspective (but code might not be as clear or easy as the other...

Forum: Main CFD Forum January 7, 2021, 12:54

Replies: 3 Future of conventional CFD now that AI based CFD is here? Views: 250 Posted By sbaffini For how it stands today, machine learning (AI is... For how it stands today, machine learning (AI is a much larger container that has stuff in it that wouldn't play any role at all in CFD) is just a very sophisticated, non linear, interpolation tool....

Forum: Main CFD Forum January 7, 2021, 05:54

Replies: 8 Why particle size should be smaller than mesh size to use DEM? Views: 231 Posted By sbaffini Hello granzer, let me try to be more specific: ... Hello granzer, let me try to be more specific: yes Yes, that was the general idea I was trying to promote but, as in most circumstances, there are exceptions. It really depends from the...

Forum: Main CFD Forum January 6, 2021, 07:29

Replies: 8 Why particle size should be smaller than mesh size to use DEM? Views: 231 Posted By sbaffini Not an expert in this specific field but, a... Not an expert in this specific field but, a general reasoning you can adopt here as well as in other cases is: if you have a grid but it doesn't capture your phenomena of interest, then a model for...

Forum: Main CFD Forum January 6, 2021, 06:42

Replies: 3 Using OpenMP similar to MPI? Bad idea? Views: 158 Posted By sbaffini If you have even a very basic understanding of... If you have even a very basic understanding of how distributed parallel works, then learning MPI, which is just a bunch of commands, is basically trivial. The actual problem with MPI is structuring...

Forum: Main CFD Forum January 5, 2021, 11:10

Replies: 1 Symmetry boundary condition, 2D simulation in 3D mesh Views: 161 Posted By sbaffini Let's just first focus on the math side with no... Let's just first focus on the math side with no specific code implementation in mind. The 3D simulation will replicate the 2D results if, for any layer of cells in the 3rd dimension, the solved...

Forum: Main CFD Forum January 5, 2021, 10:44

Replies: 8 CFD code for studies on wall roughness Views: 205 Posted By sbaffini Pros of Nek5000: spectral, scales impressively,... Pros of Nek5000: spectral, scales impressively, has a large DNS community, costantly used in production runs, can handle complex geometries "natively" Cons of Nek5000: written in old Fortran...

Forum: Main CFD Forum January 5, 2021, 10:35

Replies: 8 CFD code for studies on wall roughness Views: 205 Posted By sbaffini In theory, all of them are used for DNS studies... In theory, all of them are used for DNS studies (so, I don't know why someone would drive you away from Basilisk/Gerris if that is the code you know). In practice, Nek5000 has few advantages: it is a...

Forum: Main CFD Forum January 5, 2021, 08:46

Replies: 4 Software Suggestion For 1D Automotive Analysis Views: 168 Posted By sbaffini Ops, forgot this one from NASA... Ops, forgot this one from NASA https://www.nasa.gov/gfssp EDIT: I mentioned all the code I know (even if not explicitly tied to the automotive industry) because, as a matter of fact, there is not...

Forum: Main CFD Forum January 5, 2021, 08:43

Replies: 4 Software Suggestion For 1D Automotive Analysis Views: 168 Posted By sbaffini Are you looking for free alternatives or paid... Are you looking for free alternatives or paid ones? We mentioned both here https://www.cfd-online.com/Forums/main/186485-open-source-1d-codes.html Additional paid ones are flownex...

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