[AndresP]

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:

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:

# 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