jbasic
Josip Basic
- Joined
- May 17, 2010
- Posts
- 20
- Reaction score
- 15
- Location
- Split, Croatia
Hi all,
if you remember the old prelimina.com website for range of hydrodynamics tools (now a generic CFD tool)... a lot of you asked me for the Rhino plug-in. Now we ship it as QuickWake (see QuickWake — hull resistance and running attitude in Rhino https://quickwake.app/), because in the recent years we made a lot of progress in resistance prediction of generic .
What it is: QuickWake runs on the hull you're drawing in Rhino. It accepts a polysurface, SubD or mesh, either a full hull or one half, with no export or meshing step. You give it the loading and a speed range. For each speed it solves for the running trim and sinkage and returns:
Method: It's generalized Michell thin-ship theory with closures for friction, form, transom flow, planing lift and spray. One formulation carries the prediction from displacement speeds through the hump into planing (Morabito's method). The background is in these papers:
Validation: We compared it against towing-tank data for 11 hulls. The mean absolute error in total resistance is 5% (10% prolly max) per hull. You can load your own tank results and they're plotted beside every prediction. I'd really value feedback from this forum. That includes hulls where you think it'll fall over, tank data you'd like to see it compared against, and things you'd want in the workflow. I'm happy to run test cases and post the results here.
Cheers,
Josip
if you remember the old prelimina.com website for range of hydrodynamics tools (now a generic CFD tool)... a lot of you asked me for the Rhino plug-in. Now we ship it as QuickWake (see QuickWake — hull resistance and running attitude in Rhino https://quickwake.app/), because in the recent years we made a lot of progress in resistance prediction of generic .
What it is: QuickWake runs on the hull you're drawing in Rhino. It accepts a polysurface, SubD or mesh, either a full hull or one half, with no export or meshing step. You give it the loading and a speed range. For each speed it solves for the running trim and sinkage and returns:
- Total resistance split into friction, wave and the smaller terms, plus effective power
- Running attitude, with buoyancy and dynamic lift balanced at each speed
- The free-surface wave pattern, drawn in the viewport, which you can add to the document as geometry
- Streamlines over the wetted hull
- GZ curves at rest and at speed, with reference checks against IMO IS 2008 / HSC 2000 criteria or your own limits
- A propeller recommendation
Method: It's generalized Michell thin-ship theory with closures for friction, form, transom flow, planing lift and spray. One formulation carries the prediction from displacement speeds through the hump into planing (Morabito's method). The background is in these papers:
- Bašić, Blagojević, Andrun (2020), Improved estimation of ship wave-making resistance, Ocean Engineering 200, 107079
- Mimica et al. (2026), Neural calibration of the resistance prediction for slender ship hulls, AI for Engineering 1(2), 6
- Mimica et al., Preliminary prediction of resistance and running attitude across the displacement-to-planing transition, Ocean Engineering, under review
Validation: We compared it against towing-tank data for 11 hulls. The mean absolute error in total resistance is 5% (10% prolly max) per hull. You can load your own tank results and they're plotted beside every prediction. I'd really value feedback from this forum. That includes hulls where you think it'll fall over, tank data you'd like to see it compared against, and things you'd want in the workflow. I'm happy to run test cases and post the results here.
Cheers,
Josip
