Evaluation of Gerris flow solver for the computation of wind coefficients: Optimization of geometry preparation
Van Hoydonck, W.; Verwilligen, J.; López Castaño, S.; Mostaert, F. (2021). Evaluation of Gerris flow solver for the computation of wind coefficients: Optimization of geometry preparation. Version 2.0. FHR reports, 16_058_1. Flanders Hydraulics Research: Antwerp. VIII, 30 pp. https://dx.doi.org/10.48607/16 Part of: FHR reports. Flanders Hydraulics Research: Antwerp, more | |
| Available in | Authors | | Document type: Project report
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| Keywords | Harbours and waterways > Manoeuvring behaviour > Wind
Numerical calculations
| | Author keywords | CFD; ship wind coefficients; STL geometry preprocessing; projected area computation; surface wrapping |
| Authors | | Top | - Van Hoydonck, W., more
- Verwilligen, J., more
- López Castaño, S., more
- Mostaert, F., more
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| Abstract | The objective of project 16_058 is to evaluate the open‐source Gerris flow solver for the computation of ship wind coefficients.
In the original project plan, it was foreseen to only execute a parameter variation and grid convergence study with Gerris. While this research was started in 2016, due to shifting priorities, it was only finalised in 2021. Not only was time spend for the validation, but time was also used to automate tasks that are executed before this type of Computational Fluid Dynamics (CFD) computations can be executed. These concern the determination of the reference areas of the vessel (to convert the resultant forces and moments to dimensionless coefficients) and the creation of manifold geometry from the simulator ship models. If done by hand, these last two tasks can require up to two days per ship model. The procedures documented in this report reduce this time to less than two hours.
In the present report, the automation of the tasks to prepare geometry for CFD computations are reported. A second report will present details on the validation and use of Gerris for the determination of wind coefficients, discuss a typographical error found in literature related to the experimental determination of wind coefficients and how this error affects the accuracy and reliability of CFD methods that use the results of this reference to validate their work. The second report will also present a critical review of past research related to the simulation of atmospheric boundary layers in FINE/Marine. |
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