CFD Online Discussion Forums - forceCoeffsIncompressible writes to multiple files

Hello everyone,

I'm having trouble with the postProcess utility (OpenFOAM .org v7). I have an already simulated transient case and would like to compute force coefficients for each timestep. I have a forceCoeffsIncompressible dictionary with the corresponding parameters set in my /system directory. I'm running the postProcess utility through:

Code:

pimpleFoam -postProcess -func forceCoeffsIncompressible

My understanding (unless I'm remembering incorrectly) is that I should get a single forceCoeffs.dat file in the /postProcessing/*/forceCoeffsIncompressible directory, with the coefficients for each timestep tabulated. However, the utility writes multiple files named forceCoeffs_*.dat , where * is the time associated with the coefficients in the file. Each file has the correct format but only one row in that table I refer to. For example, for forceCoeffs_1.005.dat:

Code:

# Force coefficients

# liftDir           : (0.000000000000e+00 1.000000000000e+00 0.000000000000e+00)

# dragDir           : (1.000000000000e+00 0.000000000000e+00 0.000000000000e+00)

# pitchAxis         : (0.000000000000e+00 0.000000000000e+00 1.000000000000e+00)

# magUInf           : 8.300000000000e-01

# lRef              : 3.500000000000e-02

# Aref              : 1.940000000000e-03

# CofR              : (3.000000000000e-01 3.000000000000e-01 8.000000000000e-02)

# Time                      Cm                          Cd                          Cl                          Cl(f)                       Cl(r)               

1.005                       -6.941911664379e+00        9.463867864485e-02        9.457727060475e-01        -6.469025311356e+00        7.414798017403e+00

Only the row for t=1.005s is written.

Am I doing something wrong or is this how the utility normally works? I have spent quite some time looking for a solution on the Internet but so far I've found nothing, even on these forums.

I'd like to get a single forceCoeffs.dat with the coefficients for each time one under another (i.e. tabulated). Could someone point me in the right direction? I'd appreciate it.

Regards,
Andrés