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Seabed hydrothermal fluid circulation three-dimensional simulation method

A technology of fluid circulation and three-dimensional simulation, which is applied in design optimization/simulation, special data processing applications, instruments, etc., and can solve the problems that the evolution law of the driving mechanism cannot be directly observed

Pending Publication Date: 2020-10-02
SECOND INST OF OCEANOGRAPHY MNR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its internal driving mechanism and evolution law are still not directly observed, and fluid dynamics simulation technology is a key technical means to understand the hydrodynamic process of submarine hydrothermal fluids
However, due to the complexity of the 3D numerical simulation method and the nonlinear characteristics of the water state equation, the 3D simulation of the submarine hydrothermal cycle is still a big challenge

Method used

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  • Seabed hydrothermal fluid circulation three-dimensional simulation method
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  • Seabed hydrothermal fluid circulation three-dimensional simulation method

Examples

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Embodiment 1

[0048] The present invention relates to a three-dimensional simulation method of hydrothermal circulation under high-temperature and high-pressure environment on the seabed. Currently, the three-dimensional simulation of hydrothermal circulation is still a big challenge. The method (the geothermal simulation software HYDROTHERMAL issued by USGS) is compared to verify the reliability of the present invention. The effect display is as follows:

[0049] figure 2 Shows the 2D model mesh used in Example 1, figure 2 A and 2B represent orthogonal grids and non-orthogonal triangulations, respectively. HYDROTHERMAL simulation is limited to orthogonal grids, but the present invention can be simulated under both grids. The parameters of the model are: oceanic crust permeability k=10 -15 m 2 , porosity ε=0.1, rock specific heat C pr =800J / (kg℃), rock thermal conductivity λ r =2W / (m℃), rock density ρ r =2700kg / m 3 ;The boundary conditions are: the top represents the seabed with ...

Embodiment 2

[0051] The characteristics and advantages of the present invention are that complex three-dimensional hydrothermal circulation simulation can be performed, and the effects are as follows:

[0052] In the ultra-slow spreading mid-ocean ridge, the detachment fault has an important control effect on the hydrothermal circulation, and the method of the present invention is used to illustrate the characteristics and operation mechanism of the detachment fault's dominant hydrothermal circulation. Its geological model and grid division results are as follows: Figure 5 As shown in A, a heat source (at a constant temperature of 750°C) located about 1 km below the seafloor, a detachment fault with a width of about 100 m, and a cylinder with a radius of 50 m represent the permeability channel of the shallow oceanic crust, all of which have a permeability of 10 -14 m 2 , the oceanic crust background permeability is 10 -16 m 2 . The 100°C and 400°C isothermal surfaces, hydrothermal flu...

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Abstract

The invention discloses a seabed hydrothermal fluid circulation three-dimensional simulation method, and relates to a simulation technology for simulating fluid behaviors and a circulation evolution process in a seabed hydrothermal system based on a physical mode. A kinetic control equation set of hydrothermal fluid in an ocean shell, namely a mass conservation equation, a momentum conservation equation and an energy equation, is solved, the thermodynamic property of the fluid is updated by utilizing a state equation (IAPWS-IF97) of water, and simulation calculation of hydrothermal circulationis completed. The solution of the partial differential equation set is based on an OpenFOAM platform, so that three-dimensional model simulation, cross-platform calculation and parallel calculation of multi-format complex grids are supported. Therefore, the invention provides an important simulation technical means for researching submarine hydrothermal circulation dynamics and associated mineralization rules thereof.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of geological fluid dynamics, and in particular relates to a combination of real water state equations and control equations of geological fluid dynamics and a three-dimensional numerical simulation method of complex models. Background technique [0002] Hydrothermal circulation is an important window for the exchange of matter and energy between the interior of the earth and the exterior. It appears as geothermal fields or hot springs on land, and similar phenomena are common on the seabed, especially mid-ocean ridges. Different from hot springs on land, submarine hydrothermal vents can form hydrothermal jets with a maximum temperature of about 400°C, which are called black chimneys. Due to the high-pressure environment of the seabed, the high-temperature vent is also a natural place for the formation of supercritical water. Human beings' understanding of this spectacular natural ph...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F119/08G06F119/14G06F113/08
CPCG06F30/23G06F30/28G06F2111/10G06F2119/08G06F2119/14G06F2113/08Y02A90/10
Inventor 陶春辉郭志馗
Owner SECOND INST OF OCEANOGRAPHY MNR
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