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A large eddy simulation method for turbulent flow in highway tunnels using a sub-filtered scale model

A technology for highway tunnels and filtering scales, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., to achieve the effect of improving dissipation

Active Publication Date: 2020-03-20
金斯科 +1
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Problems solved by technology

[0007] The purpose of the present invention is to propose a large eddy simulation method for road tunnel turbulence using a sub-filter scale model to solve the problem that the current large eddy simulation calculation shows considerable uncertainty for road tunnel turbulence

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  • A large eddy simulation method for turbulent flow in highway tunnels using a sub-filtered scale model
  • A large eddy simulation method for turbulent flow in highway tunnels using a sub-filtered scale model
  • A large eddy simulation method for turbulent flow in highway tunnels using a sub-filtered scale model

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] The existing sub-filter scale (SFS) models can be roughly divided into two types according to their construction methods: functional modeling (Functional Modeling) and constructive modeling (Struetral Modeling).

[0031] The model for functional simulation is represented by the eddy viscosity model, and the velocity can be resolved by structural filtering function to directly simulate the effect of SFS stress. This type of model mainly considers the actual effect of SFS-scale motion on RFS-scale motion, and does not need to know the details of SFS-scale motion. Its typical representatives are: Smagorinsky model, spectral eddy viscosity model, structure function model (struture-function model). The Kolmogorov eddy viscosity model of V.C. Wong and D.K. Lilly et al. The current hugely successful dynamic Smagorins timber model also clearly falls ...

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Abstract

The invention provides a method for performing large eddy simulation on highway tunnel turbulence by using a sub-filtering scale model. By building a correction function D, an eddy-viscosity coefficient v<Tau> near the railway tunnel wall surface is corrected; after the method for performing large eddy simulation on highway tunnel turbulence by using the sub-filtering scale model is used, the dissipation quantity of the model near the wall surface is greatly improved, so that the dissipation of the small-dimension eddy near the wall surface is balanced; therefore the result conformity of the improved average flow speed profile and the DNS (domain name system) is better.

Description

technical field [0001] The invention relates to the field of highway tunnels, in particular to a method for simulating turbulent large eddies in highway tunnels by using a sub-filter scale model. Background technique [0002] Turbulent flow is a very irregular flow phenomenon. Its irregularity is not only manifested in the random distribution of physical quantities such as velocity and pressure in space and time, but also in its non-repetition. The main flow characteristics of simple turbulent flow can be obtained by mathematical analysis, but complex turbulent flow cannot be predicted by mathematical analysis method. For complex turbulence, in addition to physical experiments, numerical simulation is the main means of research and prediction. [0003] Theoretically speaking, using direct numerical simulation (DNS), all the information of the turbulence field can be obtained. But in fact, applying direct numerical simulation to complex turbulence calculations with high Re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20
Inventor 金斯科
Owner 金斯科
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