fdsrun

FDS guides

Short and practical: what determines the time, cost and correctness of an FDS simulation. Based on the NIST documentation and our measurements on cloud servers.

• How long does an FDS simulation take, and whyCell count, time step, T_END and the split into processes: what drives FDS run time and how to estimate it before you start.
• FDS cell size: D*/δx and the mesh sensitivity studyHow to choose the FDS cell size: characteristic fire diameter D*, the D*/δx index, cubic cells and a grid convergence check.
• Multiple meshes and MPI in FDS: how to speed up a runWhy one big mesh is slow, how to split a model into meshes, balance MPI processes and where extra cores stop paying off.
• Common FDS input file errors and how to fix themMissing &TAIL, overlapping meshes, devices outside the domain, references to undefined SURF: errors that stop FDS or spoil the results.