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Vorticity maintaining technology used in numerical simulation of incompressible swirling flow fields

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

Inactive Publication Date: 2014-07-09
西安远景动力模拟技术有限公司
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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

Method used

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  • Vorticity maintaining technology used in numerical simulation of incompressible swirling flow fields
  • Vorticity maintaining technology used in numerical simulation of incompressible swirling flow fields
  • Vorticity maintaining technology used in numerical simulation of incompressible swirling flow fields

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Embodiment Construction

[0073] 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.

[0074] 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 method for numerical simulation for vortical motion of an incompressible flow. The method is called as a vorticity maintaining technology. According to the characteristics of the incompressible flow, two forces in different forms are added in a momentum equation so as to improve numerical simulation precision of flow fields taking the vortical motion as the main thing. The forces in the two forms are respectively a spiral force of vorticity in the change gradient direction and a viscous dissipation force of the vorticity in the change gradient direction. According to the method, integral computation of the spiral force of the vorticity in a computational grid in the change gradient direction is converted into flux computation of force on a computational grid boundary, spatial dispersion of the vorticity can be in a high order precision format, and a source item of the momentum equation retains the viscous dissipation force of the vorticity in the change gradient direction for improving convergence and stability of a numerical solution. Different amplification coefficients are adopted for the two forces, vorticity precision can be further maintained, and the vortical motion in the flow fields can be simulated more precisely.

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 西安远景动力模拟技术有限公司
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