Multi-Beam

The multiBeam case applies two simultaneous IN625 heat sources separated by 100 µm in the hatch direction.

IN625 top-surface temperature during simultaneous scanning by two heat sources. The black and white contours denote the 1410 K solidus and 1620 K liquidus, respectively.

Physical setup

  • IN625 properties from $ADDITIVEFOAM_ETC/materials/IN625.cfg.
  • Two simultaneous superGaussian heat sources.
  • Each uses radius (85 85) µm, depth 30 µm, k 2, and definition e2.
  • Independent paths separated by 100 µm in the hatch direction.
  • Fluid flow disabled by nOuterCorrectors 0 in the tutorial case.
  • Each source uses tolerance 1e-3 and nPoints (10 10 10).
  • Eight MPI ranks.

Run 

cp -r "$ADDITIVEFOAM_TUTORIALS/multiBeam" "$FOAM_RUN/multiBeam"
cd "$FOAM_RUN/multiBeam"
./Allrun

Important inputs

File Purpose
constant/heatSourceDict Defines beam1, beam2, their models, and source-specific AMR buffers
constant/scanPath_1 Position, time, and power for beam1
constant/scanPath_2 Position, time, and power for beam2
constant/dynamicMeshDict OpenFOAM topology changer
system/controlDict Run controls and optional Function Objects
system/fvSolution Flow, temperature, and phase-coupling controls
system/decomposeParDict Eight-rank domain decomposition

Workflow

Allrun generates the mesh, decomposes the case, runs additiveFoam in parallel, and reconstructs the fields. Each named source reads its own scan path; the time and power columns determine when it is active.

When both beams are active, qDot and the absorbed power reported in the solver log include both sources.

Outputs

Open the reconstructed case in ParaView and visualize T, alpha.solid, and qDot to inspect the interaction between the two moving sources and their melt pools.

The AMB2018-02-B tutorial documents the quantitative and microstructure output workflows: