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Performance Analysis on the Seabed Sediment Fidelity Sampler Based on ANSYS and FLUENT

Author: LiuGuoYing
Tutor: LiuGuiJie
School: Ocean University of China
Course: Engineering Thermophysics
Keywords: Seabed sampler Fidelity Sediment ANSYS FLUENT
CLC: P736.21
Type: Master's thesis
Year: 2009
Downloads: 152
Quote: 1
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Abstract


The seafloor sediment sampling is one of the basic means of investigation of the marine environment and resources, and the reliability of sampling relies heavily on samples of fidelity, high performance requirements of seabed sampling equipment. For the inadequacies of the existing seafloor sediment sampling at home and abroad, this paper proposes a seabed sediments in situ fidelity sampling system design, and the use of the ANSYS FLUENT engineering analysis software, sampling characteristics of the penetration of the sampling system currents scour under controlled pressure and temperature performance and hydrodynamic performance in-depth study, a series of the seafloor sediment sampling system optimized design parameters, design of high-performance marine sediments fidelity sampling system has an important reference value. This article reads as follows: 1. Based on the understanding of the engineering geological characteristics of marine sediments, based on the spherical cavity expansion theory, the establishment of the sampler penetration sampling mechanical model to analyze the factors that affect the state of the samples were collected in the sampling process is derived sampling depth of penetration and resistance formula provides a theoretical basis for the high-fidelity sampling system design. Based on conservation of energy and transient heat transfer theory, using ANSYS10.0 Software built sampler fidelity finite element model of the device insulation effect, and the numerical calculation of the temperature field reveals the sampler fidelity agencies and samples temperature distribution, under which come three to meet the insulation index sample tube insulation; optimization analysis of the relevant parameters of the sample tube insulation layer on the basis of simulation and experimental analysis of thermal insulation effect factors, given meet insulation layer thickness and thermal conductivity range of design specifications for insulation device design basis. According to the theory of fluid dynamics, finite volume method for solving fluid incompressible Reynolds-averaged equations (RANS), the whereabouts of the freedom of the sampler FLUENT6.2 software process and sample the dynamic performance of the penetration process non-steady-state value simulation, numerical calculation results of the impact of the sampler factors, such as turbulence model and mesh size of the in-depth analysis, and analysis of the results with the corresponding experimental data were compared to consider the differences between the different model calculations also uses comparative analysis of five different mesh sizes for each model line, near-wall grid size calculations, and finally given the turbulence model and the grid size suitable sampler. Numerical calculation for each of the sampling distribution and resistance properties of the viscous flow field in the three cases of different Paola speed, different angle of attack, different sampling geological state, draw a sampler pressure, velocity distribution, and l resistance coefficient curve obtained calculation results compared with the theoretical formulas and empirical formulas, the results show that the simulation results with the actual anastomosis in the hydrodynamic performance sampler research has high reference value.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine geology > Marine deposition,the history of oceanography > Marine sedimentary
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