Computational Fluid Dynamics Study of Autonomous Underwater Vehicle with Vectorial Thrusters

2018 ◽  
Author(s):  
Hang Su ◽  
Chen-Wei Chen ◽  
Qian-Wen Cai ◽  
Zhuo Feng ◽  
Tong-Xu Wang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle

scholarly journals Application of non-linear k-e turbulence model in flow simulation over underwater axisymmetric hull at higher angle of attack

2011 ◽  
Vol 8 (2) ◽  
pp. 149-163 ◽  
Author(s):  
R Sakthivel ◽  
S Vengadesan ◽  
S K Bhattacharyya
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Autonomous Underwater Vehicle ◽  
Angle Of Attack ◽  
Cross Flow ◽  
Flow Simulation ◽  
Underwater Vehicle ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
Non Linear

This paper addresses the Computational Fluid Dynamics Approach (CFD) to simulate the flow over underwater axisymmetric bodies at higher angle of attacks.  Three Dimensional (3D) flow simulation is carried out over MAYA Autonomous Underwater Vehicle (AUV) at a Reynolds number (Re) of 2.09×106. These 3D flows are complex due to cross flow interaction with hull which produces nonlinearity in the flow. Cross flow interaction between pressure side and suction side is studied in the presence of angle of attack. For the present study standard k-ε model, non-linear k-ε model models of turbulence are used for solving the Reynolds Averaged Navier-Stokes Equation (RANS). The non-linear k-ε turbulence model is validated against DARPA Suboff axisymmetric hull and its applicability for flow simulation over underwater axisymmetric hull is examined. The non-linear k-ε model performs well in 3D complex turbulent flows with flow separation and flow reattachment.  The effect of angle of attack over flow structure, force coefficients and wall related flow variables are discussed in detail. Keywords: Computational Fluid Dynamics (CFD); Autonomous Underwater Vehicle (AUV); Reynolds averaged Navier-Stokes Equation (RANS); non-linear k-ε turbulence modeldoi: http://dx.doi.org/10.3329/jname.v8i2.6984   Journal of Naval Architecture and Marine Engineering 8(2011) 149-163

Robotic Fish

2014 ◽  
Vol 26 (3) ◽  
pp. 391-393
Author(s):  
Yogo Takada ◽  
◽  
Keisuke Koyama ◽  
Takahiro Usami
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Robotic Fish ◽  
Remotely Operated Vehicle ◽  
Gate Arrays ◽  
Propulsion Performance ◽  
Entertainment Robot ◽  
Computational Fluid Dynamics Cfd

<div class=""abs_img""><img src=""[disp_template_path]/JRM/abst-image/00260003/13.jpg"" width=""300"" />Structure of BREAM </span></div> Based on our robotic fish studies since 2003, this paper introduces a FPGA offline control underwater searcher (FOCUS) and a bream robot equipped with advanced mechanism (BREAM). The performance of the first FOCUS prototype, built in 2011, is now being improved. FOCUS has 2 cameras and fieldprogrammable gate arrays (FPGAs) with high arithmetic processing capabilities. The appearance of the FOCUS is so cute. The two FOCUS types now available are an autonomous underwater vehicle (AUV) and a remotely operated vehicle (ROV). BREAM, in contrast, is an entertainment robot prototype designed for Asutamuland Tokushima exhibition. BREAM has four joints based on analytical computational fluid dynamics (CFD) results showing that robotic fish with multiple joints achieve better propulsion performance than that with single joint. Two of the four joints are used for propulsion and two are used for turning the prototype. RC-FOCUS is also exhibited at Asutamuland Tokushima, together with BREAM. </span>

scholarly journals CFD Investigation of Trout-Like Configuration Holding Station near an Obstruction

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 204
Author(s):  
Kamran Fouladi ◽  
David J. Coughlin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Laboratory Experiment ◽  
Numerical Models ◽  
Interaction Model ◽  
Underwater Vehicle ◽  
Water Stream ◽  
Hydrodynamic Analysis ◽  
Structure Interaction ◽  
Vehicle Systems

This report presents the development of a fluid-structure interaction model using commercial Computational fluid dynamics software and in-house developed User Defined Function to simulate the motion of a trout Department of Mechanical Engineering, Widener University holding station in a moving water stream. The oscillation model used in this study is based on the observations of trout swimming in a respirometry tank in a laboratory experiment. The numerical simulations showed results that are consistent with laboratory observations of a trout holding station in the tank without obstruction and trout entrained to the side of the cylindrical obstruction. This paper will be helpful in the development of numerical models for the hydrodynamic analysis of bioinspired unmanned underwater vehicle systems.

Computational Fluid Dynamics Applied on an Autonomous Underwater Vehicle

2004 ◽  
Author(s):  
Arnt-Lennard Fuglestad ◽  
Mads Grahl-Madsen
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Drag Force ◽  
Autonomous Underwater Vehicle ◽  
Reynolds Numbers ◽  
Paper Report ◽  
Computer Aided Analysis ◽  
Present Paper Report ◽  
Defence Research

The present paper report on a comparison between experimental obtained data for the drag force acting on a model prototype of the HUGIN 3000 and data obtained from a Computer Aided Analysis of the drag force carried out by CFD (Computational Fluid Dynamics). The HUGIN 3000 was developed in the nineties, by Kongsberg Maritime and FFI (Norwegian Defence Research Establishment). The experimental results in this paper, origins from a model test carried out by Marintek. The range of Reynolds number for both the experimental data and the computational results is 2.707×106 to 1.146×107. The agreement between the experimental data and the computed results is good. Particularly for the highest Reynolds numbers, the prediction of drag force by CFD seems to be remarkable good.

scholarly journals Design and Performance Analysis of Contra-rotating Pumpjet Propulsor under Condition of Torque Unbalance

2018 ◽  
Vol 167 ◽  
pp. 03006
Author(s):  
Xiao-er Wang ◽  
Zhen-shan Zhang ◽  
Meng Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Design Method ◽  
Three Dimensional ◽  
Underwater Vehicle ◽  
Inverse Design ◽  
Parameter Design ◽  
Power Difference ◽  
Inverse Design Method ◽  
And Performance

In order to balance the torque of front rotor and rear rotor of underwater vehicle, the analysis of the speed triangles at the inlet and outlet of the front and rear rotor has been done. Then, the thought of using contra-rotating pumpjet to achieve the objective was raised. The stator is installed behind the rear rotor so as to ensure the overall torque of the propulsor balance, at the same time, the stator can also support the shroud of the propulsor. the parameter design of the rotor and the stator has been carried out by using the three dimensional inverse design method. At last, the performance of the designed pumpjet propulsor is obtained when it is installed on the underwater vehicle By using computational fluid dynamics. The results show that the total torque of the propulsor is reduced to 1.8 N * m on the design point although the power difference ratio of the front rotor and the rear rotor is 20%. The torque ratio is also reduced from 4.6% to 0.4%, which is good to meet the propulsor balance requirement and verifies the 3-D design method of pumpjet is effective.

Hull form design of underwater vehicle applying CFD (Computational Fluid Dynamics)

2010 ◽  
Author(s):  
Tomoya Inoue ◽  
Hiroyoshi Suzuki ◽  
Risa Kitamoto ◽  
Yoshitaka Watanabe ◽  
Hiroshi Yoshida
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Underwater Vehicle ◽  
Hull Form ◽  
Form Design ◽  
Hull Form Design
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