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Viscous item processing method applied to high-precision discontinuous Galerkin fluid simulation

A high-precision, viscous term technology, applied in the field of computational fluid dynamics, can solve the problems of increasing the number of computational equations and the actual calculation amount, reducing the computational accuracy, etc., so as to eliminate the gradient and gradient derivatives, simplify the calculation process, and improve the computational efficiency. Effect

Active Publication Date: 2021-11-02
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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  • Application Information

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Problems solved by technology

Traditional methods need to calculate and store variable gradients and gradient derivatives. While increasing the number of calculation equations and the actual calculation amount, it will reduce the calculation accuracy in high-precision cases

Method used

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  • Viscous item processing method applied to high-precision discontinuous Galerkin fluid simulation
  • Viscous item processing method applied to high-precision discontinuous Galerkin fluid simulation
  • Viscous item processing method applied to high-precision discontinuous Galerkin fluid simulation

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Embodiment Construction

[0018] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0020] like figure 1 As shown, in this embodiment, a high-precision discontinuous Galerkin framework is used to subdivide the space to generate a computational grid, and the viscous flux is calculated through iterative integration to generate a grid for obtaining lift, drag, velocity, density, and pressure. The specific process is as follows :

[0021] S1: Divide the space to obtain the calculation grid, and use the high-precision discontin...

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Abstract

The invention discloses a viscous item processing method applied to high-precision discontinuous Galerkin fluid simulation, which is used for solving the problem that the calculation precision is lower than the theoretical precision when a Navier-Stokes equation is calculated by a Galerkin method, so as to accurately capture information such as lift force, resistance, speed, density, pressure and the like for engineering application in a flow field. The method comprises the following steps: subdividing a space to obtain a computational grid, and processing a Navier-Stokes equation by adopting a high-precision discontinuous Galerkin framework to obtain a control equation in a semi-discrete form; defining a new lifting operator, calculating the viscosity flux by the new lifting operator to acquire a calculation result of the viscosity item after integration; and solving and calculating the equation by adopting an iteration mode to obtain a simulation result. Calculation precision of a high-order format is effectively kept while the calculation amount is saved, and the calculation precision is higher than the theoretical precision.

Description

technical field [0001] The invention relates to computational fluid dynamics technology flow field, in particular to a viscosity item processing method applied to high-precision discontinuous Galerkin fluid simulation. Background technique [0002] As an important branch of computational fluid dynamics, high-precision discontinuous Galerkin simulation calculation has good dispersion and dissipation characteristics, is suitable for solving multi-scale complex problems, and can capture fine flow field calculation information with less computing resources. More and more scholars attach great importance to it. [0003] The high-precision discontinuous Galerkin method can only solve hyperbolic conservation equations with first-order partial derivatives, such as the Euler equation, but most of the problems faced by fluid simulation are based on the Navier-Stokes equation. In order to solve the Navier-Stokes equation, And to obtain information such as lift, drag, velocity, density...

Claims

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Application Information

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IPC IPC(8): G06F30/28
CPCG06F30/28Y02T90/00
Inventor 赵辉陈江涛杨悦悦张耀冰吴晓军贾洪印李欢张培红周桂宇崔鹏程陈洪杨
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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