Optimization of microgrooves for water–solid drag reduction using genetic algorithm

Abdollahzadeh, M. J ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1007/s40722-020-00170-y
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2020
  4. Abstract:
  5. The friction on the water–solid interfaces continues to be the most important factor for the energy loss in many marine and submarine applications. Therefore, different techniques have been developed and are available to reduce friction and, as a result, the overall cost. In the past decades, the use of structured surfaces has been given considerable attention because of their specific characteristics such as their abilities in pressure drop reduction. However, an appropriate optimization method is required to find the best surface structure. In the present study, we consider a microgrooved substrate and examine the performance of three shapes including rectangular, elliptical, and trapezoidal cross-sections for the geometry of the grooves. A genetic algorithm is employed, as an optimization tool, and is coupled with the volume of fluid method, as a computational fluid dynamics method, and the drag is minimized. The configurations are compared and the optimum geometry is determined. The results indicate that about 22% decrease in the drag can be achieved. The best solution is considered and the effect of the velocity (capillary number) on the drag is determined. Furthermore, the amount of water that is penetrated into the grooves is discussed. © 2020, Springer Nature Switzerland AG
  6. Keywords:
  7. Drag reduction ; Genetic algorithm ; Marine applications ; Microgrooved substrates ; Computational fluid dynamics ; Drag ; Energy dissipation ; Friction ; Genetic algorithms ; Surface structure ; Computational fluid dynamics methods ; Optimization method ; Optimization tools ; Pressure drop reductions ; Structured surfaces ; Submarine applications ; Trapezoidal cross sections ; Volume of fluid method ; Phase interfaces
  8. Source: Journal of Ocean Engineering and Marine Energy ; Volume 6, Issue 3 , 2020 , Pages 221-242
  9. URL: https://link.springer.com/article/10.1007/s40722-020-00170-y