Wake Field Design System
The Wake Field Design System is a program that outputs the hull form that realizes your input ideal wake field. This system consists of hull form blending technique and machine learning, and the model of the system is based on the hull form database constructed by CFD.
- In Japan Only
Outline
The Wake Field Design System is a program that outputs the hull form that realizes your input ideal wake. This system is composed of following three functions.
- (1) Hull Form Blending
Function to blend (or merge) two user-owned hull form data to obtain a new hull form. - (2) Wake Design
Function to obtain a new hull form which realized an input ideal wake field.
（Unstructured database is also supported）
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Outline of Wake Field Design System
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Outline of Hull Form Blending (Hull Form morphing)
Interface
The wake Field design system can obtain three-dimensional hull surface data available for CAD and CFD through the following interfaces.
How to use the Wake Field Design System.
The wake design system consists of three functions: Each function can be switched individually in the tabs at the top.
- (1) Hull Form Blending
Function to blend (or merge) two user-owned hull form data to obtain a new hull form. - (2) Wake Design
Function to obtain a new hull form which realized an input ideal wake field.
（Unstructured database is also supported）
(1) HULL FORM BLENDING
The Function of hull form blending can blend (or merge) two user-owned hull form data to obtain a new hull form.
Use the p3d format files of the two hull shapes (format detail is described in the next chapter) for hull blending. The contents of the p3d format file correspond to both the overall structural grid shape and the structural grid shape of the hull surface but must be consistent between the two ship types you enter.
Uploading Geometry Files
Upload p3d format files for the two hull shapes.
Check the uploaded grid shape
If you press "Show Graph", you can check the 3D shape of the hull form uploaded in the browser.
Set hull blending parameters
Set the hull blending parameters, which are the blending parameters for the two hull shapes, with the slider bar.
HULL FORM BLENDING
After pressing “Create blended ship” button, the system will generate a new blended hull form. The calculation will take a little less than 1 minute, so please wait. Once the output is complete, you can see the three-dimensional shape of the input two hull forms and the three blended hull forms.
(2) WAKE DESIGN
The Function of Wake Design can obtain a new hull form which realized an input ideal wake field. Unlike the function of Hull Form from DB, it also supports unstructured databases that are not structurally defined DB with hull form parameters.
Input of the ideal wake
Input the wake distribution you want to achieve. You can enter the distribution directly or upload the specific data file which you can download from this site.
Set Design Constraint
If necessary, enter design criteria (limits) to limit the database to be searched. If blank, design without restrictions.
output of the hull form
After pressing the "Create the hull from generating the target wake" button, the system create a new hull form which can generate the input ideal wake field. The calculation will take a little less than 1 minute, so please wait. When the calculation is complete, you can view the three-dimensional shape of the new hull in the browser.
Output data format
newgrid.p3d
Data of structural grids of output hull form. It also contains spatial grid information and can be used directly in CFD calculations that developed in NMRI. The Plot 3d format is compatible with the “.bfc” file format which used in the HULLDES/AUTODES. The p3d format is a standard CFD format developed at the NAPA Ames Research Center in 1982.
Example of plot3d file format
newhull.p3d
The hull surface data of the output hull form. The format is plot3d format.
newhull_rhino_mcro.txt
A text file containing commands for generating hull surface data with the three-dimensional CAD software Rhinoceros. If you open the file, copy the contents, paste it on Rhinoceros, and run it, you can recreate the hull shape of the output hull shape on Rhinoceros.
To use this application
Use of this app is limited to users in Japan.
References
Ichinose, Y., Tahara, Y. A wake field design system utilizing a database analysis to enhance the performance of energy saving devices and propeller. J Mar Sci Technol 24, 1119–1133 (2019). https://doi.org/10.1007/s00773-018-0611-x Ichinose, Y., Taniguchi, T. A curved surface representation method for convolutional neural network of wake field prediction. J Mar Sci Technol (2021). https://doi.org/10.1007/s00773-021-00857-3