Calculation of Amphibian Floating Drag under the Effect of Sea Waves Using Computational Fluid Dynamics

Document Type : Original Article

Authors

1 PhD student Malek Ashtar University of Technology, Shahinshahr, Isfahan

2 assistant professor Malek Ashtar University of Technology, Shahinshahr, Isfahan

3 professor, Malek Ashtar University of Technology, Shahinshahr, Isfahan

4 PhD, Malek Ashtar University of Technology, Shahinshahr, Isfahan

Abstract

Hovercrafts are amphibious marine vehicles that are capable of moving on the surface of the water and land. In this article, hovercraft drag has been calculated at different speeds and in three states. The first state of floating completely submerged in the air, the second floating above the surface of the ground and the third considering the waves below the float. In the second and third cases, numerical modeling has been done with different floating distances from the ground or the sea. Simulation in the first and second states is done in single phase and in the third state in two phases. 14 and 16 simulations have been done in single-phase and two-phase modes, respectively. A total of 30 simulations were carried out, a parametric study on the variables of water depth, wave length and height, floating speed and distance from the surface were considered.The cells of the solution domain is of trimmer type and structured in the Star CCM software, and for the numerical solution, the finite volume method is used in the Fluent software. The standard k-ω turbulence model has been used to model turbulence in single-phase mode, and the k-ω sst model has been used in two-phase mode. In order to identify and simulate the free surface of the flow in the third state, the fluid volume fraction method has been used. In order to validate, the numerical modeling of the drag of the KCS container carrier was carried out, and the comparison of the numerical results with the experimental results were in good agreement. The results showed that increasing the height of the waves decreases and increasing the wavelength increases the drag force. Also, reducing the distance from the surface reduces the drag force.

Keywords

Smiley face

 

References

[1]  Sadeghizadeh MR, Hemayati M. Flying Boats. Tehran. 2005. (In Persian) Malek Ashtar University of Technology.
[2]   Yun L, Bliault A, Doo J. WIG craft and ekranoplan. Ground Effect Craft Technology. 2010;2.
[3]   Saeid NH, Yunus E, Fei OC. CFD simulation of air flow around a hovercraft. 2014.
[4]   Zare K, Mohammadi A, Zarei M. Effect of air outlet hole parameter on shape and intensity of closed padding change in havercrafts.  17th Marine Industry Conference2015.
[5]   Kohansal A, Mousavi M. Design of Havercraft.  17th Marine Science Conference; 2015; Bushehr University1394.
[6]   Rajabi I, Behzadi M, Khalili A. simulation and aerodynamic analysis of air hovercraft hovering.  17th Marine Labor Conference; Malek Ashtar University2016. (In Persian).
[7]   Milaadipour M, Parsa MI, Rabi A. Numerical Investigation of the Effect of the Conductor Blade on the Distribution of Pressure and Lifting Capacity of Havercraft.  Conference on New Technologies in Science; Mazandaran University2017. (In Persian).
[8]   Pogorelova AV. Wave resistance of an air-cushion vehicle in unsteady motion over an ice sheet. Journal of applied mechanics and technical physics. 2008;49:71-9.
[9]   Qian J-l, Dai C. Unsteady flow structure of an airfoil in ground effect. Journal of Shanghai University (English Edition). 2010;14(3):228-34.
[10] Cohen M, Miloh T, Zilman G. Wave resistance of a hovercraft moving in water with nonrigid bottom. Ocean engineering. 2001;28(11):1461-78.
[11] Ahmed N, Goonaratne J. Lift augmentation of a low-aspect-ratio thick wing in ground effect. Journal of Aircraft. 2002;39(2):381-4.
[12] Saeed-Jame A-M, Agoes-Priyanto N-A. AERODYNAMIC CHARACTERISTICS OF A
COMPOUND WING DURING GROUND EFFECT.
[13] Pogorelova A, Kozin V, editors. Effect of current on wave resistance of an air cushion vehicle. Journal of Physics: Conference Series; 2019: IOP Publishing.
[14] Mantle P. Maximum lift-drag ratio of air cushion craft. The Aeronautical Journal. 2017;121(1239):693-709.
[15] Petoft H, Rahi A, Fakhari V. simulation of the air flow inside the hovercraft system and determination of the force applied to the air cushion.  29th Annual International Conference of Iranian Association of Mechanical Engineers and 8th International Conference on Thermal Power Plants Industry; Tehran2020.
[16] Amini S, Rostami Varnousfaaderani M, Dehghan Manshadi M, Norouzi H. Numerical simulation of submarine motions in three degrees of freedom in irregular waves for drag force estimation. Fluid Mechanics & Aerodynamics. 2024;12(2):69-83.
[17] Farajollahi AH. Experimental Investigation of the Effects of Arrangement of Vortex Generators on Behavior of a Vortical Flow around an Axisymmetric Body. 2019.
[18] Shivachev E, Khorasanchi M, Day S, Turan O. Impact of trim on added resistance of KRISO container ship (KCS) in head waves: An experimental and numerical study. Ocean Engineering. 2020;211:107594.
[19] Hsiun C-M, Chen Co-K. Aerodynamic characteristics of a two-dimensional airfoil with ground effect. Journal of aircraft. 1996;33(2):386-92.
[20] Pasandidehfard M-, Saberinia M, Izadfar M. Analysis of Submerged 2D Hydrofoils with Finite Depth. Fluid Mechanics & Aerodynamics Journal. 2020;8(2):1-17 (in persian).https://dor.isc.ac/dor/20.1001.1.23223278.1398.8.2.1.4
[21] Chun H, Chang R. Turbulence flow simulation for wings in ground effect with two ground condition fixed and moving ground. 2003.
[22] ITTC, editor Recommended
Procedures and Guidelines, Resistance Test. 26th ITTC Resistance Committee, 75-02-02-01; 2011.
Fluid Mechanics & Aerodynamics
Volume 13, Issue 2 - Serial Number 33
Autumn and winter 2024
November 2024
Pages 113-124

Files

History

  • Receive Date: 06 July 2024
  • Revise Date: 29 September 2024
  • Accept Date: 05 November 2024
  • Publish Date: 21 November 2024

Share

How to cite

Statistics