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Vorticity refinement used in numerical simulation of incompressible swirling flow field

A numerical simulation, vorticity technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve the problems of uncertainty in the stability of convergence and inability to further improve.

Inactive Publication Date: 2012-09-19
TIANJIN AEROCODE ENG APPL SOFTWAREDEV
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Problems solved by technology

[0023]2. The spatial discrete precision of the added vorticity is limited and cannot be further improved;
[0024]3. The influence of the source term on the stability of the convergence of the numerical solution of the momentum equation is uncertain

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  • Vorticity refinement used in numerical simulation of incompressible swirling flow field
  • Vorticity refinement used in numerical simulation of incompressible swirling flow field
  • Vorticity refinement used in numerical simulation of incompressible swirling flow field

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Embodiment Construction

[0074] Further illustrate what the present invention proposes with a specific embodiment below, this numerical simulation technique can be realized with Fortran90 computer high-level programming language, and simulates the surrounding flow field of three-dimensional delta wing under the high angle of attack flight state by computer operation.

[0075] In a specific embodiment, the incompressible flow field of a delta wing with a large span ratio at a high angle of attack is used. A large number of experiments have shown that the delta wing flies at a high angle of attack, and the flow field around it is dominated by vortex motion. The chord length of the delta wing is c, the wingspan is b, and the wing-to-wing ratio is 7. The calculation grid adopts multi-block structured fit hexahedral grids, O-shaped grids are used around the wing, 192 grids around the wing section direction; 68 grids in the normal direction; 96 grids in the span direction. figure 2 shows the geometry of t...

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Abstract

The invention relates to a numerical simulation method for the vortex motion of an incompressible flow, being called as vorticity refinement. According to the characteristics of the incompressible flow, two different forms of forces are added to a momentum equation so that the precision of the numerical simulation of a flow field based on the vortex motion. The two forms of forces are respectively a spiral force and a viscous dissipation force of vorticity in the varying gradient direction. The numerical simulation method leads the integral computation of the spiral force of the vorticity in a computational grid in the varying gradient direction to be converted into the flux computation of a superior force on a boundary of the computational grid and can lead the spatial dispersion of the superior force to have a high-order accuracy format; simultaneously, a source item of the momentum equation reserves the viscous dissipation force of the vorticity in the varying gradient direction for increasing the convergence and stability of a numerical solution. The two forces adopt different amplification coefficients so that the accuracy of the vorticity can be further remained, and the vortex motion in the flow field can be more accurately simulated.

Description

technical field [0001] The invention relates to a numerical method in the field of computational fluid dynamics (CFD: Computational Fluid Dynamics), in particular to a vortex maintenance technique used in numerical simulation of an incompressible swirl field. Background technique [0002] Computational Fluid Dynamics combines fluid mechanics, applied mathematics, and computer science, and is a subject with strong applicability. Numerical simulation of fluid mechanics problems occupies an important position in various related fields such as the exploration of the mechanism of fluid flow and the design of industrial products due to its advantages of low cost and strong intuition. One of the biggest problems and challenges facing computational fluid dynamics is how to improve the accuracy of numerical simulation, reduce errors, and faithfully represent the characteristics of fluid flow. [0003] One of the important factors affecting the accuracy of numerical simulation of flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 路明
Owner TIANJIN AEROCODE ENG APPL SOFTWAREDEV
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