[dupeng]

I recently find that execFlowFunctionObjects outputs different results with the solver output. Take the DTCHull case as an example, when I use interFoam and output the log file. The forces output in the last timestep is:

=====================================
forces forces output:
sum of forces:
pressure : (-2.87174 1621.49 3915.17)
viscous : (-12.8331 -0.209267 -0.278943)
porous : (0 0 0)
sum of moments:
pressure : (-521.019 27.7322 430.802)
viscous : (0.023115 3.04292 -3.95596)
porous : (0 0 0)
=====================================

and when I recalculate the force using execFlowFunctionObjects -latestTime, it outputs:

=====================================
forces forces output:
sum of forces:
pressure : (-2.87174 1621.49 3915.17)
viscous : (-68.8092 -12.4143 5.80855)
porous : (0 0 0)
sum of moments:
pressure : (-829.102 -3807.88 2019.12)
viscous : (3.00731 -44.1551 -66.8254)
porous : (0 0 0)
=====================================

Only the pressure forces are the same. Does anybody know the reason? Thanks

[wyldckat]

Quick answer: execFlowFunctionObjects was deprecated precisely because it didn't support all transport models, such as multiphase.

You need to either run it with the solver in older versions, or create a modified version of execFlowFunctionObjects or use OpenFOAM 4.0 and newer to use the solver itself, e.g. interFoam -postProcess. More details in the release notes, look for "function objects": https://openfoam.org/release/4-0/