Pressure distribution on a hull in a slanted flow ...

[mc_rash]

Hey @ligathosting did you just replace the geometry in the DTCHullMoving case? Once I ran the original DTCHull (resistance, not moving) the pressure force didn't seem to converge at all and was very, very spiky and humpy. I did another calculation with my own setup and a plot of the pressure resistance was much smoother and converging.

In my opinion the OpenFOAM tutorials must be handled with care and must be adjusted to get useful results!

Btw, paraview is helpful for the visualization of the flow but for numbers I can only recommend postprocessing the results with python.

Kind regards

 

[mc_rash]

... is there a "easy to use" software providing this?

Easy to use means like michlet or flotilla. I tried to get into openfoam, but the dozens of different solvers and the correct formulation of the boundary conditions are a bit overwhelming for me. A potential based code for gnu octave or matlab would also help.

@ropf if you have a specific case I would be pleased to help you out with CFD.

 

[ligathosting]

Hey @ligathosting did you just replace the geometry in the DTCHullMoving case? Once I ran the original DTCHull (resistance, not moving) the pressure force didn't seem to converge at all and was very, very spiky and humpy. I did another calculation with my own setup and a plot of the pressure resistance was much smoother and converging.

In my opinion the OpenFOAM tutorials must be handled with care and must be adjusted to get useful results!

Btw, paraview is helpful for the visualization of the flow but for numbers I can only recommend postprocessing the results with python.

Kind regards

I didn't just replace the 3d ship file, I made a new much larger blockMeshDict file because it is original for a scaled ship of 6m. My intention is to do openfoam HPC and ships of 50m or with about 200M cells. My script is for parallel processing on 4 servers 40 hardware cores and 435gb of memory.
Yes, a lot of changes need to be made compared to the tutorial.
I did 2 quick simulations and the results are a bit uneven, but the difference in the forces and moment forces along the y axis is immediately clear. For the analysis of forces.dat and moment.dat, only libreofice calc is not enough so python scripts are not out of the question.