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. (click on images to show videos on YouTube) Update History • v1.0 (04.08.2022) changes (public release) • public release • v1.1 (29.09.2022) changes (GPU voxelization) • added solid voxelization on GPU (slow algorithm) • added tool to print current camera position (key G ) • minor bug fix (workaround for Intel iGPU driver bug with triangle rendering) • v1.2 (24.10.2022) changes (force/torque computation) • added functions to compute force/torque on objects • added function to translate Mesh • added Stokes drag validation setup • v1.3 (10.11.2022) changes (minor bug fixes) • added unit conversion functions for torque • and can now be used independently • minor bug fix (workaround for AMD legacy driver bug with binary number literals) • v1.4 (14.12.2022) changes (Linux graphics) • complete rewrite of C++ graphics library to minimize API dependencies • added interactive graphics mode on Linux with X11 • fixed streamline visualization bug in 2D • v2.0 (09.01.2023) changes (multi-GPU upgrade) • added (cross-vendor) multi-GPU support on a single node (PC/laptop/server) • v2.1 (15.01.2023) changes (fast voxelization) • made solid voxelization on GPU lightning fast (new algorithm, from minutes to milliseconds) • v2.2 (20.01.2023) changes (velocity voxelization) • added option to voxelize moving/rotating geometry on GPU, with automatic velocity initialization for each grid point based on center of rotation, linear velocity and rotational velocity • cells that are converted from solid->fluid during re-voxelization now have their DDFs properly initialized • added option to not auto-scale mesh during , with negative parameter • added kernel for solid boundary rendering with marching-cubes • v2.3 (30.01.2023) changes (particles) • added particles with immersed-boundary method (either passive or 2-way-coupled, only supported with single-GPU) • minor optimization to GPU voxelization algorithm (workgroup threads outside mesh bounding-box return after ray-mesh intersections have been found) • displayed GPU memory allocation size is now fully accurate • fixed bug in function in • removed file extension for Linux/macOS • v2.4 (11.03.2023) changes (UI improvements) • added a help menu with key H that shows keyboard/mouse controls, visualization settings and simulation stats • improvements to keyboard/mouse control ( + / - for zoom, mouseclick frees/locks cursor) • added suggestion of largest possible grid resolution if resolution is set larger than memory allows • minor optimizations in multi-GPU communication (insignificant performance difference) • fixed bug in temperature equilibrium function for temperature extension • fixed erroneous double literal for Intel iGPUs in skybox color functions • fixed bug in make.sh where multi-GPU device IDs would not get forwarded to the executable • minor bug fixes in graphics engine (free cursor not centered during rotation, labels in VR mode) • fixed bug in size parameter standard initialization • v2.5 (11.04.2023) changes (raytracing overhaul) • implemented light absorption in fluid for raytracing graphics (no performance impact) • improved raytracing framerate when camera is inside fluid • fixed skybox pole flickering artifacts • fixed bug where moving objects during re-voxelization would leave an erroneous trail of solid grid cells behind • v2.6 (16.04.2023) changes (Intel Arc patch) • patched OpenCL issues of Intel Arc GPUs: now VRAM allocations >4GB are possible and correct VRAM capacity is reported • v2.7 (29.05.2023) changes (visualization upgrade) • added slice visualization (key 2 / key 3 modes, then switch through slice modes with key T , move slice with keys Q / E ) • made flag wireframe / solid surface visualization kernels toggleable with key 1 • added surface pressure visualization (key 1 when is enabled and is called) • added binary export function for meshes with • added for function in extension • made correction of wrong memory reporting on Intel Arc more robust • fixed bug in template functions • reverted back to separate for each OpenCL device, as the shared Context otherwise would allocate extra VRAM on all other unused Nvidia GPUs • removed Debug and x86 configurations from Visual Studio solution file (one less complication for compiling) • fixed bug that particles could get too close to walls and get stuck, or leave the fluid phase (added boundary force) • v2.8 (24.06.2023) changes (documentation + polish) • finally added more documentation • cleaned up all sample setups in for more beginner-friendliness, and added required extensions in as comments to all setups • improved loading of composite geometries, by adding an option to omit automatic mesh repositioning, added more functionality to struct in • added function to compute simulation box resolution based on box aspect ratio and VRAM occupation in MB • added function to export images for a specified video length in the compute loop • added macros to ease setting visualization modes in headless graphics mode in • simulation box dimensions are now automatically made equally divisible by domains for multi-GPU simulations • fixed Info/Warning/Error message formatting for loading files and made Info/Warning/Error message labels colored • added Ahmed body setup as an example on how body forces and drag coefficient are computed • added Cessna 172 and Bell 222 setups to showcase loading composite .stl geometries and revoxelization of moving parts • added optional semi-transparent rendering mode ( in ) • fixed flickering of streamline visualization in interactive graphics • improved smooth positioning of streamlines in slice mode • fixed bug where and in extension were also allocated in CPU RAM (not required) • fixed bug in Q-criterion rendering of halo data in multi-GPU mode, reduced gap width between domains • removed shared memory optimization fro…