Here is code I used to process force data for my swept foil experiments and for forced vibration experiments.
Feel free to modify for your own processing needs/chuckle at my poor coding abilities.
Overview of what you need to do to process force data:
Load in the two files you obtained 1)*.lvm contains force data 2) *.txt contains position data
Calculate the inertia forces. You can either do this by repeating your experiments in air (but that requires draining and refilling the tank), or using F_inertia = (mass of everything below the force sensor)* (acceleration), where acceleration is calculated using the double derivative of position (from the *.txt file). This file is saved in hex format, so you need to convert it to a read-able form.
Calculate the total forces. Do this by multiplying the 6x6 calibration matrix (and scaling factors) to the 6 columns of force data (they should be the first 6 of the 9 columns saved, if you used our standard LabView program to collect data). Apply an appropriate filter.
Calculate the hydrodynamic forces. F_hydro is the remaining component of F_total after you remove F_inertia.
Calculate non-dimensional coefficients as desired. Use the length of the submerged span in the calculation.