A Method for Identifying Turbulent Flow Regions

Abstract

The invention discloses a method for identifying a turbulent region, which relates to the field of computational fluid dynamics and includes the following steps: Step 1: Obtain a flow field that needs to be analyzed for flow; Step 2: Calculate the turbulent region identification value σ of the flow field; Step 3: Judging whether the turbulent region identification value σ is 0, if so, the flow field is a turbulent region, otherwise not; the turbulent region identification value σ is obtained based on the local Reynolds number and the eddy stretch function, and the present invention provides a A turbulent region identification method independent of eddy viscosity coefficient makes the turbulent region identification method have a wider scope of application.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a method for identifying turbulent flow regions. 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 techniques include: Reynold...

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Problems solved by technology

like figure 1 Shown is the map of the turbulence region that needs to be identified; figure 2 Shown is the identification result of the turbulent region identification function in the prior art. The disadvantage of this method is that only when a specific algorithm is used, the value of the eddy viscosity coefficient can represent whether the region is turbulent; and in many algorithms, or there is no Eddy viscosity coefficient (such as implicit large eddy simulation method, and large eddy simulation method using non-eddy viscosity model, etc.), or eddy viscosity coefficient can change between positive, negative and zero values ​​(such as dynamic eddy viscosity model)

Therefore, the application range of existing turbulent region identification methods is quite limited

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