Add microfluidic geometry and transport primitives - #2
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This was referenced Aug 20, 2026
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August 20, 2026 23:47
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The coupled step's obstacle and velocity-field buffers size themselves from the grid specification, which was declared below them, so no CUDA build of this branch compiled. The declaration moves above its first use. `scripts/run_cuda_compile_check.sh` now passes and registers all 21 tests. Hardware conformance still needs an NVIDIA host.
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removed this pull request from stack #7
September 10, 2026 10:33
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Add finite box/cylinder device walls, solid transport masks, face-staggered velocity fields, and cell removal so one device description can constrain cells and route solutes. Sampling and scattering retain only the face-connected fluid component of the strongest interpolation weight, preventing exchange between regions that merely touch at a corner.
The PR is stacked on the conserved-biomass prerequisite. Validation covers obstacle isolation, amount conservation, periodic advection-diffusion refinement, and native CPU/Metal conformance. Focused transport checks passed (43 Python tests; CUDA cases skipped locally). The revised native CUDA sources also compile in CUDA 12.8.1.