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Numerical method for simulating pollutant dispersion in swirling flow field

A numerical method and pollutant technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems that cannot be further improved, and the stability of convergence is uncertain.

Inactive Publication Date: 2013-04-24
TIANJIN AEROCODE ENG APPL SOFTWAREDEV
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Problems solved by technology

[0009] 2. The spatial discrete precision of the added vorticity is limited and cannot be further improved;
[0010] 3. The stability effect of the source term on the convergence of the numerical solution of the momentum equation is uncertain

Method used

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  • Numerical method for simulating pollutant dispersion in swirling flow field
  • Numerical method for simulating pollutant dispersion in swirling flow field
  • Numerical method for simulating pollutant dispersion in swirling flow field

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Embodiment Construction

[0069] In the following, a specific embodiment is used to further illustrate what the present invention proposes. This numerical simulation technology can be realized with Fortran90 computer high-level programming language, and simulate the diffusion of pollutants in the three-dimensional swirl field through computer operation.

[0070] In the present invention, it is required to add a vector generated due to the helical force of the vorticity in the direction of the gradient gradient on the calculation grid boundary It means adding this vector after the convection term on the left side of the momentum equation, and adding the viscous dissipation force in the direction of the gradient of the vorticity change to the position of the source term on the right side of the equal sign Rewrite the three-dimensional integral form of the momentum equation (2) according to the conservation law,

[0071] ∂ ∂ t ...

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Abstract

The invention provides a numerical method for simulating pollutant dispersion in a swirling flow field. According to characteristics of incompressible flows, two forms of force are added in a momentum equation to improve numerical simulation accuracy of the vortical-motion-oriented flow field. The two forms of force are respectively vortical force and viscous dissipation force of a vorticity in the changing gradient direction. The numerical method enables integral calculation of the vortical force of the vorticity in a computational grid in the changing gradient direction to be converted into flux calculation of force on a boundary of the computational grid and can enable spatial dispersion to have a high-order accuracy form. In addition, the viscous dissipation force of the vorticity in the changing gradient direction is retained by a source item of the momentum equation so as to improve convergence and stability of a numerical solution. The two forms of force adopt different amplification coefficients, the accuracy of the vorticity can be further kept, and pollutant dispersion movement in the swirling flow field can be accurately simulated.

Description

technical field [0001] The invention relates to a numerical method in the application field of computational fluid dynamics (CFD: Computational Fluid Dynamics), in particular to a numerical method for simulating the diffusion of pollutants in a swirling flow field. Background technique [0002] Incompressible vortex-dominated flows are a common phenomenon in hydraulic engineering. For example, the sudden expansion of harbors, the meandering boundaries of rivers and coasts, and the flow field behind large pier columns all show large-scale fluid vortex motion, and the heat and mass transfer processes of pollutants are more complicated. The study of its hydrodynamic characteristics and material transport laws is the basic task of environmental hydraulics. [0003] There are many research methods for the diffusion of pollutants in the swirl field. Among them, computer numerical simulation technology plays an important role, and it is an extended application of computational fl...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 路明
Owner TIANJIN AEROCODE ENG APPL SOFTWAREDEV
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