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DeltaShift is one of the key functionality in FRIENDSHIP-Framework for hull form variation.

DeltaShift can be uses as a position-shifting function and also as, so to say, influence function.

DeltaProduct is another functionality which multiplies all DeltaShifts selected.

In the attached file, there is a way to arise the tip of bulbous bow not effecting stem surface.

From now on, Goose-neck and Rem type bulbous bow could be made by this partially parametric variation method.

// Daehwan

 

 

P.S. Some gif animaton could be found at the blog :

 

http://daehwan2034.wordpress.com/2014/05/15/bulbous-bow-tip-variation/

 

 

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Hi Daehwan,

 

For my master thesis I found this concept will be useful since I have to optimise the EEDI value of ship.

 

Can you please elaborate more about this variation process?

 

Do I need to specify some delta shift function before using this?

 

Also can I apply this and do my calculations with out doing any modifications in the forepart?

 

Also if I have designed already a hull with bulbous bow in NAPA how can can I modify it(bulbous bow only) with parametrisation in Cases? If I can do so can I do with out modifying the fore part?

 

Regards,

D.Prabu

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Hi Prabu,

 

Yes, deltashift function should be used.

Technically in CAESES bulb tip variation without affecting forebody is possible but it seems not so effective for the better retrofit in the view point of hydrodynamic performance since the variation will happen within too narrow range.

When the hullform could be exported as IGES or STL file from NAPA, they could be imported again in CAESES and be formally varied with the combination of deltashift functions.

 

Regards

Daehwan

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Hi Daehwan,

 

Thank you for the reply. After importing can I proceed only by using lackenby shift(forepart) and delta shift (bulbous bow) functions to do it in a partially parametric way(my time duration is limited for the project). Also if you can explain more about using delta shift function it will be helpful for me.

 

Regards,

D.Prabu.

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Hi Prabu

 

How much do you know about transformation in CAESES?

Just for bulb tip variation, deltaShift and deltaProduct skills were used.

 

When you are not familiar with deltaShift, please get helped by CAESES documents first (samples >> transformations).

 

Regards

Daehwan.

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