Troubleshoot

Unrecognized drag and mass transfer model

[6] --> FOAM FATAL ERROR:
[6] Unknown dragModelType type Grace

This may mean that you are using multiphaseEulerFoam instead of birdmultiphaseEulerFoam

BDOFoam does not compile

birdmultiphaseEulerFoam requires OpenFOAM 9 but bdoFoam requires OpenFOAM 6. Compiling bdoFoam also requires a little more work that birdmultiphaseEulerFoam. Detailed step are discussed here

In the future, we will make sure that bdoFoam works with OpenFOAM 9.