Numerical simulation method for rotational turbulence in compressible cavitation flow

Abstract

The invention belongs to the field of engineering computational fluid mechanics, and particularly relates to a numerical simulation method for rotational turbulence in compressible cavitation flow. The method mainly comprises the following steps: calculating a vortex viscosity coefficient and sub-lattice stress by adopting a compressible nonlinear sub-lattice model, introducing an adjusting factorto correct the sub-lattice stress, creating a compressible nonlinear sub-lattice model base class, and implanting the compressible nonlinear sub-lattice model into the compressible cavitation flow solver. According to the method, the influence of the rotational turbulence in the compressible cavitation flow is considered, the stability of compressible cavitation flow calculation is ensured by introducing an adjustment factor, the requirements of compressible cavitation flow simulation on grids can be effectively reduced, and the calculation efficiency is improved. Meanwhile, a new thought isprovided for deeply researching the influence of compressibility in compressible cavitation flow on rotational turbulence.

Description

technical field [0001] The invention relates to the field of engineering calculation fluid dynamics, more specifically, to a numerical simulation method of rotating turbulent flow in compressible cavitation flow. Background technique [0002] Cavitation is a central problem in high-speed hydrodynamics. In water, cavitation often induces complex vortex structures, so that cavitation flow is considered as a rotating turbulent flow, which often exhibits characteristics such as nonlinearity, strong transient, and high pulsation. At the same time, the cavitation flow is essentially a vapor-liquid two-phase flow with phase change, which leads to the strong compressibility of the cavitation flow. Traditional commercial CFD software is mostly developed based on the incompressible framework, which cannot accurately simulate the compressible characteristics of cavitation flow. Although the open-source CFD software OpenFOAM can perform numerical simulation of compressible cavitation ...

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Problems solved by technology

Traditional commercial CFD software is mostly developed based on the incompressible framework, which cannot accurately simulate the compressible characteristics of cavitation flow

Although the open-source CFD software OpenFOAM can perform numerical simulation of compressible cavitation flow, the existing turbulence models are all compressible linear eddy-viscosity models. Although this type of model has a simple structure and is convenient for calculation, it is physically untenable. Also cannot adequately account for the strong rotational effects of turbulence in compressible cavitation flows

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