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Compressible flow-based numerical simulation method for analyzing wall surface function

A numerical simulation and wall surface technology, applied in the field of numerical simulation of analytical wall surface functions, can solve problems such as not satisfying local equilibrium conditions, and achieve accurate wall heat flow, tight coupling, and accurate prediction

Active Publication Date: 2019-11-22
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

However, complex flows in industrial applications usually include flow separation and reattachment, these flows do not satisfy the local equilibrium conditions, so it is not appropriate to apply standard wall functions to complex flow problems

Method used

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  • Compressible flow-based numerical simulation method for analyzing wall surface function
  • Compressible flow-based numerical simulation method for analyzing wall surface function
  • Compressible flow-based numerical simulation method for analyzing wall surface function

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present ...

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Abstract

The invention discloses a numerical simulation method for analyzing a wall surface function based on compressible flow. The method comprises the following steps: establishing a Navier-Stokes equationaccording to compressible flow characteristics, simplifying the Navier-Stokes equation, analyzing the Navier-Stokes equation to obtain a full turbulence zone speed equation, a viscous bottom layer speed equation, a full turbulence zone temperature equation and a viscous bottom layer temperature equation, and further defining a stress equation and a heat flow equation; giving an initial value of the temperature Tv of the viscous bottom layer, and calculating according to the Tv to obtain stress and heat flow; updating a stress item and a heat flow item by utilizing the calculated stress and heat flow; updating the values of a generation item and a dissipation item in the turbulence energy equation by calculating the average quantity of the turbulence energy generation item and the turbulence energy dissipation item; and finally, recalculating Tv by utilizing a viscous bottom layer temperature equation, and repeatedly updating in the next time step cycle. Based on the compressible flow characteristic, the method is particularly suitable for hypersonic flow, and the wall surface heat flow can be predicted more accurately.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a numerical simulation method based on the analytical wall function of compressible flow. Background technique [0002] At present, the wall function of most engineering applications is based on the assumption of local equilibrium, and the velocity and temperature near the wall satisfy the logarithmic law. Therefore, under the condition of non-equilibrium flow, the standard wall function can only get very low prediction accuracy. However, complex flows in industrial applications usually include flow separation and reattachment, and these flows do not satisfy local equilibrium conditions, so it is not appropriate to apply standard wall functions to complex flow problems. In addition to the standard wall function, the analytical wall function does not involve too many assumptions at the wall, and the prediction accuracy on the coarse grid can be close to the result of th...

Claims

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Application Information

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IPC IPC(8): G06F17/11
CPCG06F17/11
Inventor 王新光万钊陈琦何鲲江定武郭勇颜白进维张爱婧高晓成毛枚良
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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