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ProjectPhysX
FluidX3D
C++2022–2025
ProjectPhysX / FluidX3D

FluidX3D

The fastest and most memory efficient lattice Boltzmann CFD software, running on all GPUs and CPUs via OpenCL. Free for non-commercial use.

Science & EngineeringSystems & InfrastructureTesting & Quality
Explore on GitHubRead Hacker News discussions
7Distinct people
13Mentions
0Explicit recommenders
5.4KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

The fastest and most memory efficient lattice Boltzmann CFD software, running on all GPUs and CPUs via OpenCL. Free for non-commercial use.

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 1:49:46 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year13 dated mentions

Observed mentions: 2022-08-06 02:59:25 UTC to 2025-04-24 19:57:59 UTC.

0123452022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 5 mentions; 2 submissions, 3 comments20232024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 4 mentions; 2 submissions, 2 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC211
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC523
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC422
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC202

What Hacker News says

13 sources
fc417fc802·Apr 24, 2025
Sorry my interest there is debugging and I'm not immediately coming across good benchmarks. PoCL [0] seems to have added a TBB backend [1] so I'd expect it to be reasonable (otherwise why bother) but I haven't tested it. It isn't really related to your question but I think the FluidX3D benchmarks [2] illustrate that OpenCL is at least viable across a wide variety of hardware. As far as targeting CPUs in a release build it's not a particular backend that's important to me. The issue is at the source code level. Having single source is nice but you're still stuck with these two very different approaches. It means that the code is still clearly segmented and thus retargeting any given task (at least nontrivial ones) involves rewriting it to at least some extent. Contrast that with a model like OpenMP where the difference between CPU and GPU
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is marking the relevant segment for offload. Granted that you'll often need to change algorithms when switching to achieve reasonable performance but it's still a really nice quality of life feature not to have to juggle more paradigms and libraries. [0] https://github.com/pocl/pocl [1] https://portablecl.org/docs/html/drivers.html [2] https://github.com/ProjectPhysX/FluidX3D
In CubeCL: GPU Kernels in Rust for CUDA, ROCm, and WGPU
samstave·Jan 15, 2024
Couple thoughts: The jitter is likely due to the suction pulling the air from the outside of the tubes, which then get pulled in the gap between the things - which does so in a buffeting fashion due to the movement of the pipes, so it finds the oscillation... (the tubes are a Foil - so you have to accomodate the flow diff on the external and internal of your receiving tube - and how the flows from the outside of the foil are a diff speed/flow/rate than the center of the tube - thus the light suction guy gets enough strength for the outside air to push it back - once it gets far enough from the horizontal tube, the pressure from the outside flow drops and the lever goes back to its resting position and begins again) The other thing, as he mentioned eddys -- the inlet and outlet cones should be turbine-spiral shapes - as the air/fluid comes
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down the pipe, if you give it a spiraling/riffling it will keep the flow somewhat cohesive as it spins it. Further, as a YT comment mentioned - stuffing a bunch of small straws in the main tube helps, because if you have a lot of smaller tubes - (especially with water) you can get the effective "orientation of the molocules" the same - so your stream can be more cohesive (this method was (invented?employed) by Disney Land Engineers when they were building the fountains that shoot clean, cohesive lasers of water. They run the streams to the fountain through pipes that have a ton of staws inside - so the water gets orientated in such a way that when the stream leaves the nozzle, the water stays together. Also - you can test all this in FluidX3d: https://github.com/ProjectPhysX/FluidX3D -- The Eddy Pump was first invented by Leo Davinci... and now we have great pumps like: https://eddypump.com/pump-videos -- The eddy is the most important thing to understand in fluid dynamics IMO. (its what your Heart is, BTW) ---- @Btrettel: THANKS! I couldn't think of the term laminar... And I was simplifying "stuffing straws".. Appreciate the input. Have you tried FluidX3D?
In Feynman Sprinkler [video]
samstave·Jan 2, 2024
Could even use this as a revers GLOBAL ORBITING SYSTEM [GoS] - Whereby a single satellite|probe dispels a lander to a planet with the Quantum Magnetic Cannister, and that QMC signals its global location to the satellite launcher, and the satellit can extrap its location based on the absolute location of the ground guys... (might need more than one ground magnet-moles?) How can this be measured? Can fluidx3d do martian magnetics? [0] -- [0] https://github.com/ProjectPhysX/FluidX3D --- EDIT: "Mars does not have a magnetosphere" ELI5: "how do electronics work when there is zero magnetic field around them? A complete antimagnetic environ?" I've never heard any mention about making any electrical device work on a planet (such as mars) in a complete magnetically dark location? How is there gravity on mars if there is no magnetic field for a pla
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net, and how can mass, the size of a planet not produce magnetism/gravity if its not made of iron-sh (the RED of the planet) ELI5, please.
In Earthquake in Japan yesterday may have shifted land 1.3 meters
samstave·Dec 26, 2023
I DO! PICK ME PICK ME!!! First, be aware of FluidX3d [0] [1] - which is awesome for CFD simulations, OSS, etc... Here is the premise of the CFD question: It has long been known that Eddies [2] were studied by da vinci - and he was the first to propose the eddy pump... and how eddies work in hydrodynamics - and aerodynamics. The barnacles on the leading edge of a Wales fin is also thought to cause beneficial eddies in the fin's ability to cut through water more efficiently with less drag. Dimples on a golf ball affect the air-flow in tiny micro eddies, but at extraordinary speeds - where (I surmise) a certain amount of 'cavitation' may occur with a very thin film around the ball - kind of like water-tension, but with tiny eddies [4] SO: Create a Helicopter blade with leading-edge 'Barnacles' similar to the shapes of the Acorn barnacles on
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wale fins, which will create eddies as the air passes/affect the flow of the air over the foil. Add dimples of varying shape profiles (such as convex round dimples to hexagonally based dimples (much easier in aircraft which are already based on titanium honey-comb-sandwhich materil) But make the dimples morphic - being able to electrostaticly "activate" the dimples (meaning they are either on or off for the simulation) The goal is to determine the characteristic of having dimples and/or barnacles have a net positive impact on the flow and conditions of air over a foil in the helicoptor blade - or the fixed wing of larger craft - or the entire fuselage dimpled like a golf-ball affecting fuel efficiency or other factors of lift or flight that could be visualized easily using something like [0] [0.0] https://github.com/ProjectPhysX/FluidX3D [0.1] https://www.youtube.com/watch?v=mhacLfz92h0 <--- This is a fantastic video tutorial on installing FluidX3D [1] https://www.reddit.com/r/CFD/comments/10ghc2d/fluidx3d_blows... [2] https://theconversation.com/how-leonardo-da-vinci-master-of-... [3] https://marinesanctuary.org/blog/whales-and-barnacles-an-unl... [4] https://www.scientificamerican.com/article/how-do-dimples-in...
In Challenging projects every programmer should try (2019)

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