[CenterRime]

Good day.

For catamaran hulls hydrodynamic passports we need calculate forces and moments of force for geometric shapes in flow.

For that purpose we have build CfdOF case and post-process Python script.
All data is open and we will upload case and results on gitHub.

Problem is I am not understand correctly that pressure mean in OpenFoam.
Script for calculation of drag force and yaw moment of the hull

1. Wigley body
Pressure difference between bow and stern (force of resistance to rectilinear motion): 23.282568642571178 kgf
Pressure difference on the starboard and port side (drift force): 957.3720653957847 kgf
Pressure difference between bow and stern along the XZ plane (turning force): 310.2378232213018 kgf

2. Darth18 case
Pressure difference between bow and stern (force of resistance to rectilinear motion): 52.29271371957253 kgf
Pressure difference on the starboard and port side (drift force): 707.3221705652993 kgf
Pressure difference between bow and stern along the XZ plane (turning force): 460.9348338505562 kgf

3. Body Knife
Pressure difference between bow and stern (resistance force to rectilinear motion): 39.956765095057506 kgf
Pressure difference on the starboard and port side (drift force): 1255.2393975077616 kgc
Pressure difference between bow and stern along the XZ plane (turning force): 350.90999322729 kgf

4. Body - stem cylinders or pirogues
Pressure difference between bow and stern (resistance force to rectilinear motion): 30.53412464362008 kgc
Pressure difference on the starboard and port side (drift force): 681.7223724508121 kgf
Pressure difference between bow and stern along the XZ plane (turning force): 220.89399426653483 kgc

5. Body AUF (inflatable carrot, blunt end first)
Pressure difference between bow and stern (resistance force to rectilinear motion): 33.04866398583098 kgc
Pressure difference on the starboard and port side (drift force): 435.42133515210753 kgc
Pressure difference between bow and stern along the XZ plane (turning force): 74.1517491635035 kgf

Calculation for catamaran hulls of equal length and displacement at a flow rate of 3m/s at a drift angle of 30 degrees.
Corresponds to the angle of drifting in close-hauled, towing and bulking of the hull against an obstacle by the force of a current or a large wave.
Body length 5m, frame width 2m. The total displacement of each hull is 670 kg.
The calculation was carried out for a completely submerged body without taking into account wave formation.
Catamaran_hull_flow_p.jpg