ProjectPhysX/FluidX3D

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

Stars: 5.3k
Forks: 472
Open beginner issues: 0
Indexed issues: 50

Dominant language: C++
License: No license data
Last GitHub push: Sep 7, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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50 open issues indexed

New API to design simulations Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ProjectPhysX/FluidX3D#355 · Opened Sep 13, 2026
macOS Tahoe 26.5: VOLUME_FORCE silently dropped when SUBGRID is enabled Open

compiler/driver/OS issue

Difficulty 4/5 3-5 days Newbie friendliness 38/100

ProjectPhysX/FluidX3D#349 · 1 comment · 2 reactions · Opened Jul 14, 2026
D3Q7 thermal stability at τ_T → 0.5 - any plans for TRT on the temperature lattice? Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

ProjectPhysX/FluidX3D#347 · Opened Jun 12, 2026
Qualcomm Adreno GPUs Support Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#346 · 6 comments · Opened May 27, 2026
Cells excluded from the simulation box ? Open

setup question

Difficulty 4/5 3-5 days Newbie friendliness 38/100

ProjectPhysX/FluidX3D#344 · 3 comments · Opened May 23, 2026
Feature request: restart / checkpoint support for continuing simulations Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

ProjectPhysX/FluidX3D#340 · Opened Apr 12, 2026
Question: for steam and other fluids coupling to Thermopack or other tools possible? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#336 · Opened Mar 4, 2026
Question: Mesa RustiCL Driver full support of FluidX3D? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#335 · 2 comments · 2 reactions · Opened Mar 4, 2026
Galilean Invariance and Force Calculation on Moving Boundaries in FluidX3D Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#334 · Opened Feb 1, 2026
Screen flickering on Nvidia RTX 5090M Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ProjectPhysX/FluidX3D#333 · 1 comment · Opened Jan 29, 2026
Unusual density fluctuations have been observed in submarine acoustic simulation. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#332 · 1 comment · Opened Jan 28, 2026
The system crashes just after the end of simulation loop. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#330 · Opened Jan 16, 2026
Interest in surface export functionality? Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#327 · 2 comments · 1 reaction · Opened Dec 30, 2025
NDzip: a gpu data compressor of tu vienna Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#322 · 2 comments · Opened Dec 14, 2025
Suggestion on bufferzone to reduce acoustic reflection on TYPE_E boundaries Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ProjectPhysX/FluidX3D#321 · 1 reaction · Opened Dec 6, 2025
ALM for VAWT Simulation Issues and GPU Optimization in FluidX3D Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#320 · 2 comments · Opened Nov 21, 2025
Suggestion: VDB import / export support Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 32/100

ProjectPhysX/FluidX3D#319 · 2 reactions · Opened Nov 20, 2025
MacOS XQuartz Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#315 · 2 comments · 1 reaction · Opened Nov 7, 2025
Coriolis force implementation Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

ProjectPhysX/FluidX3D#313 · 4 comments · Opened Oct 25, 2025
An error related to graph settings occurred when running the ahmed case. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ProjectPhysX/FluidX3D#312 · Opened Oct 22, 2025
Multi-GPU Particle Tracking & Immersed Boundary Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#306 · 32 comments · Opened Jul 29, 2025
Multiphase modeling in future versions Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#302 · 1 comment · 1 reaction · Opened Jul 14, 2025
free slip boundary conditions request Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#301 · 1 comment · Opened Jun 30, 2025
OpenCL API with MTT S80 Open

compiler/driver/OS issue

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#296 · 13 comments · 3 reactions · Opened May 29, 2025
MacOS compilation issue Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

ProjectPhysX/FluidX3D#292 · 3 comments · Opened May 19, 2025
Feature Request: Actuator Line Model (ALM) for VAWT Torque Calculation in FluidX3D Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#289 · 1 comment · Opened Apr 21, 2025
Some issues on temperature extension Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#287 · 1 comment · Opened Apr 16, 2025
Reasonable Mesh resolution Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#284 · 1 comment · 1 reaction · Opened Apr 3, 2025
Ray tracing and multi-gpu/ doman Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 30/100

ProjectPhysX/FluidX3D#282 · 3 comments · Opened Mar 27, 2025
Attempting to simulate silicone mold Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ProjectPhysX/FluidX3D#278 · Opened Mar 14, 2025
How to get the average mean/std wind flow field and force field? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#273 · Opened Mar 2, 2025
Face Centered Cube Lattice Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

ProjectPhysX/FluidX3D#272 · Opened Feb 28, 2025
Question about Solving for stability Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#268 · 3 comments · Opened Feb 8, 2025
Questions about boundary TYPE_E Open

setup question

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#262 · 1 comment · Opened Jan 19, 2025
Grid refinement - Question Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#249 · 4 comments · Opened Nov 20, 2024
Showcase? Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#248 · 2 comments · 2 reactions · Opened Nov 19, 2024
Raytracing with STL Geometry Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#243 · 1 comment · Opened Nov 2, 2024
Artificial temperature diffusion at the solid boundary (TYPE_S) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#241 · Opened Nov 1, 2024
Simulation of Ahmed body setup is unstable with MOVING_BOUNDARIES enable Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ProjectPhysX/FluidX3D#238 · Opened Oct 22, 2024
10-15% Speedup by enqueuing more at a time Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#231 · 2 comments · Opened Sep 27, 2024
Integrate the Temperature module with other modeles. Open

setup question

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#227 · Opened Sep 23, 2024
Acoustic Propagation via Varying Density Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#216 · Opened Aug 20, 2024
Regarding passive tracer particles Open

setup question

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#207 · 3 comments · Opened Jul 31, 2024
Conflicting declaration when compiling on 32 bit powerpc Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#206 · 3 comments · 1 reaction · Opened Jul 22, 2024
Including the scale, frame-info, and copyright notice inside the output PNG files ? Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#190 · 1 comment · Opened Jun 3, 2024
Coupling with other solvers possible with precice? Or senseless? Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

ProjectPhysX/FluidX3D#164 · 2 comments · Opened Mar 18, 2024
Example setup for Urban Wind CFD analysis Open

setup question

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#142 · 3 comments · Opened Jan 27, 2024
Question – has anybody tried LB for simulating the total drag for a ship moving through water? Open

setup question

Difficulty 5/5 Over a week Newbie friendliness 25/100

ProjectPhysX/FluidX3D#127 · 6 comments · Opened Nov 12, 2023
White immovable streamlines on F1 Car Open

setup question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

ProjectPhysX/FluidX3D#104 · 5 comments · 1 reaction · Opened Aug 23, 2023
Report your benchmark results here! Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 35/100

ProjectPhysX/FluidX3D#8 · 277 comments · Opened Sep 22, 2022

ProjectPhysX/FluidX3D

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