Use Gomboc to optimize foil design

Question

226 views24 June 2024Gomboc Model

anonuser78 24 June 2024 0 Comments

Is it possible to use the profile/chord/sweep of the foils as an optimization parameter ? Is the software intended more for a manual optimization using the foil editor or can we autonomize the process ?

anonuser Asked question 24 June 2024

2 Answers

score 0 · Answer 1 · 2024-06-24T21:59:07+00:00

This can be done using a module. Please see AppendageOptimisationModule.js attached as an example. If optimizing the chord, you would need to create states like:

Boat.Centre.ChordCP0
Boat.Centre.ChordCP1
Boat.Centre.ChordCP2
Boat.Centre.ChordCP3
Boat.Centre.ChordCP4

then include this module, which on each iteration will set the chord of 5 control points to the current state values. You could try this first outside of an optimisation – check that changing the value of a state manually changes the foil – then set them to optimise. You would need sensible limits on the chord min and max.

In the optimisation *.bic file, make sure to include the AppendageOptimisationModule.js. For instance:

//———————————————————————————————-

// Add foil design in optimisation

//———————————————————————————————-

if (boatSpec.EnableFoilChordOptimisation) {

R.merge(“Blocks.” + boatSpec.Name + “.Centre”, {

//Optimisation variables for chord design

ChordCP0 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP1 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP2 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP3 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP4 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

});

R.merge(‘Modules.AppendageOptimisation’, {

File: spec.boatPath+”Modules/AppendageOptimisation.js”,

Constructor: {

Param1: 1,

},

});

}

score 0 · Answer 2 · 2024-06-24T21:53:31+00:00

This can be done using a module. Please see AppendageOptimisationModule.js attached as an example. If optimizing the chord, you would need to create states like:

Boat.Centre.ChordCP0
Boat.Centre.ChordCP1
Boat.Centre.ChordCP2
Boat.Centre.ChordCP3
Boat.Centre.ChordCP4

then include this module, which on each iteration will set the chord of 5 control points to the current state values. You could try this first outside of an optimisation – check that changing the value of a state manually changes the foil – then set them to optimise. You would need sensible limits on the chord min and max.

In the optimisation *.bic file, make sure to include the AppendageOptimisationModule.js. For instance:

//———————————————————————————————-

// Add foil design in optimisation

//———————————————————————————————-

if (boatSpec.EnableFoilChordOptimisation) {

R.merge(“Blocks.” + boatSpec.Name + “.Centre”, {

//Optimisation variables for chord design

ChordCP0 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP1 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP2 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP3 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

ChordCP4 : BL.State({Min: 0.01, Max: 0.5, Optimise: true, }),

});

R.merge(‘Modules.AppendageOptimisation’, {

File: spec.boatPath+”Modules/AppendageOptimisation.js”,

Constructor: {

Param1: 1,

},

});

}