Numerical study on the six-DOF anchoring process of gravity anchor using a new mesh update strategy

Jin, Zuanming; Cai, Wen-Hao; Hu, Wenqing; Gong, Ye-jun; Li, Tian-zeng

doi:10.1016/j.marstruc.2016.12.007

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…Also, for the CFD simulation of the 3D moving objects, the mesh update strategy is key to the mesh quality of the dynamic mesh, which is always applied to the problems with mobile and/or deformable boundaries. 62 On the other hand, in the case of large-scale boundary movements, the grid deformation algorithm may fail to produce a quality grid for the solver. Hence, a remeshing algorithm must be employed to improve the robustness and quality of the grid generation.…”

Section: Resultsmentioning

confidence: 99%

Combining CFD, ASE, and HEKF approaches to derive all of the hydrodynamic coefficients of an axisymmetric AUV

Rasekh

Mahdi

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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In this proposed method, which is based on combination of the nonlinear Hybrid Extended Kalman Filter (HEKF) observer, Analytical and Semi-Empirical (ASE) formulas, and Computational Fluid Dynamics (CFD) simulations, all of the hydrodynamic coefficients of a REMUS AUV are estimated to simulate its motions in 6 Degrees of Freedom (6-DoF). First, Using ASE formulas along with necessary static simulations of the AUV using commercial CFD code of ANSYS CFX software, some hydrodynamic derivatives like drag, lift, and fin coefficients are obtained. Then, utilizing the dynamic simulation of the Straight-Line Test (SLT), the longitudinal added mass coefficient is derived. Finally, benefiting from the HEKF code based on the parameter identification, other unknown coefficients like added mass and damping are estimated in the MATLAB software environment. In HEKF, positions and velocities of the vehicle, which are the system output vector, are obtained from a 6-DoF dynamic maneuver in CFX. It is worth mentioning that, in the present study, the remeshing algorithm in the dynamic mesh approach is used to simulate the dynamic maneuvers of the vehicle. Results, obtained from the proposed combined method, indicate a good agreement for estimated coefficients in comparison with the available analytical and experimental values.

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Section: Resultsmentioning

confidence: 99%

Combining CFD, ASE, and HEKF approaches to derive all of the hydrodynamic coefficients of an axisymmetric AUV

Rasekh

Mahdi

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Because a six-DOF motion of the glider moving in the water will lead to large deformation of the dynamic grid during numerical simulations, a traditional dynamic mesh updating method, such as local remeshing, cannot be used for these cases. In order to make the dynamic mesh updating process more effective and more efficient, we have proposed a new type of dynamic mesh method, named the motion-based zonal mesh update (MBZMU) method, which has successfully been applied in the simulation of the six-DOF motion of a gravity anchor [20,21], thus, the MBZMU method is adopted for simulation in this paper. As described in our previous works [20,21], the division of the computational domain still takes the same form.…”

Section: Dynamic Mesh Updating Methodsmentioning

confidence: 99%

“…In order to make the dynamic mesh updating process more effective and more efficient, we have proposed a new type of dynamic mesh method, named the motion-based zonal mesh update (MBZMU) method, which has successfully been applied in the simulation of the six-DOF motion of a gravity anchor [20,21], thus, the MBZMU method is adopted for simulation in this paper. As described in our previous works [20,21], the division of the computational domain still takes the same form. i.e., the entire computational domain is successively divided into eight sub-domains numbered 1~8, which is marked in Figs 2 and 3.…”

Section: Dynamic Mesh Updating Methodsmentioning

confidence: 99%

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A study on the hydrodynamic performance of manta ray biomimetic glider under unconstrained six-DOF motion

2020

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A manta ray biomimetic glider is designed and studied with both laboratory experiments and numerical simulations with a new dynamic update method called the motion-based zonal mesh update method (MBZMU method) to reveal its hydrodynamic performance. Regarding the experimental study, an ejection gliding experiment is conducted for qualitative verification, and a hydrostatic free-fall experiment is conducted to quantitatively verify the reliability of the corresponding numerical simulation. Regarding the numerical simulation, to reduce the trend of nose-up movement and to obtain a long lasting and stable gliding motion, a series of cases with the center of mass offset forward by different distances and different initial angles of attack have been calculated. The results show that the glider will show the optimal gliding performance when the center of mass is 20mm in front of the center of geometry and the initial attack angle range lies between A0 = -5° to A0 = -2.5° at the same time. The optimal gliding distance can reach six times its body length under these circumstances. Furthermore, the stability of the glider is explained from the perspective of Blended-Wing-Body (BWB) configuration.

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“…Pankajakshan et al (2002) used the interpolation of pre-deformed grids to improve the mesh quality. This was solved in this study by using the multi-block hybrid dynamic grids (MHDG) method presented by Zhan et al (2017).…”

Section: Introductionmentioning

confidence: 99%

A physics-based simulation for AUV underwater docking using the MHDG method and a discretized propeller

Liu

et al. 2019

Ocean Engineering

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Numerical study on the six-DOF anchoring process of gravity anchor using a new mesh update strategy

Cited by 11 publications

References 28 publications

Combining CFD, ASE, and HEKF approaches to derive all of the hydrodynamic coefficients of an axisymmetric AUV

Combining CFD, ASE, and HEKF approaches to derive all of the hydrodynamic coefficients of an axisymmetric AUV

A study on the hydrodynamic performance of manta ray biomimetic glider under unconstrained six-DOF motion

A physics-based simulation for AUV underwater docking using the MHDG method and a discretized propeller

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