Novel sub-lattice scale model establishment method

A model building and sub-grid technology, applied in the field of computational fluid dynamics, can solve problems such as large non-physical dissipation, and achieve the effect of accurate description and clear physical meaning

Active Publication Date: 2021-07-13
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, a new sub-grid scale model establishment method provided by the present invention solves the problem of excessive non-physical dissipation in the non-turbulent flow region and the transition region of the existing model

Method used

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Embodiment Construction

[0033] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0034] Such as figure 1 As shown, a new sub-grid scale model building method includes the following steps:

[0035] S1. Based on the eddy stretch function, the definition of eddy viscosity coefficient is obtained;

[0036] The expression of the eddy viscosity coefficient is:

[0037]

[0038] C vsv =0.25(i)

[0039] In the above formula, ˉ is a filter, is the eddy viscosity coefficient, C vsv is the model constant...

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Abstract

The invention discloses a novel sub-lattice scale model establishment method. The method comprises the following steps: S1, obtaining a vortex viscosity coefficient definition based on a vortex stretching function; S2, obtaining a vortex viscosity sub-lattice scale model according to the vortex viscosity coefficient; and S3, obtaining a dynamic vortex viscosity sub-lattice scale model according to the vortex viscosity coefficient. Compared with a traditional vortex viscosity sub-lattice scale model based on a deformation rate tensor, the vortex viscosity coefficient definition based on the vortex stretching function, the vortex viscosity sub-lattice scale model and the dynamic vortex viscosity sub-lattice scale model which are obtained through the vortex viscosity coefficient definition have clearer physical significance, and can describe the distribution of the turbulence vortex viscosity more accurately.

Description

technical field [0001] The invention belongs to the field of computational fluid dynamics, and in particular relates to a method for establishing a novel sub-grid scale model. Background technique [0002] Computational fluid dynamics (CFD) is an interdisciplinary subject of fluid mechanics, computational mathematics, and computers. It uses computers to simulate fluid dynamic equations to obtain information such as force, heat, and frequency of fluid motion, thereby providing data support for related industrial designs. With the development of computer technology, computational fluid dynamics is playing an increasingly important role in aerospace, transportation, chemical industry, machinery, energy and other fields. [0003] Fluid flow is divided into laminar flow and turbulent flow. Real flows are basically turbulent, or at least partially turbulent. The key to accurately predicting fluid motion is turbulence simulation technology. Current turbulence simulation techniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 邓小兵
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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