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Flow Science official website: www.flow3d.com Legacy documentation for v11.04: Available to customers via the Knowledge Base This article is for educational purposes. The author does not condone software piracy. Always obtain software licenses through legal channels.
flow3d_solver.exe -np 16 my_simulation.inp The -np flag sets the number of CPU cores. 16 cores is typical for an HEDT PC. In the GUI, go to Numerics > Advanced > GPU Settings and check “Use CUDA for linear solvers.” Ensure your NVIDIA driver is updated (version 531 or later). Defragment Scratch Files Flow3D writes temporary results to disk. Use a dedicated SSD drive formatted with NTFS. Set the TMP environment variable to a folder on that drive. Benchmark Before Full Run Always test with a coarse mesh (e.g., 500k cells) to verify boundary conditions and timestep stability before committing to high-resolution runs. Common Issues in Flow3D 11.04 x64 and Fixes Problem: “License checkout failed” after install. Solution: Rehost your license file – the MAC address may have changed after Windows updates.
Simulation runs but shows “CFL number too high.” Solution: Reduce timestep multiplier or refine mesh near walls.