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Fluid distribution calculation method based on VOF principle

A calculation method and fluid distribution technology, applied in the field of CFD, can solve problems such as inability to accurately calculate the initial value of VOF of CFD grid units, and achieve the effects of saving computer memory, improving calculation efficiency, and high-precision calculation

Active Publication Date: 2021-07-27
HARBIN ENG UNIV
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Problems solved by technology

[0015] The purpose of the present invention is to overcome the deficiency that the VOF initial value of the CFD grid unit cannot be accurately calculated in the prior art, and provide a high-precision VOF initial value for the CFD solution, so as to better ensure the correctness and initial convergence of the CFD solution A Calculation Method of Fluid Distribution Based on VOF Principle

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  • Fluid distribution calculation method based on VOF principle
  • Fluid distribution calculation method based on VOF principle
  • Fluid distribution calculation method based on VOF principle

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Embodiment 1

[0113] Step 1. Read in the CFD grid file, such as the .msh grid file in Ansys Fluent format. Since the geometric topology relationship contained in the grid file is usually not comprehensive, and there is no unit body or surface centroid data, it is necessary to read Take the CFD grid file for pre-processing, that is, improve the topological relationship between the unit and the node, the unit and the surface, the surface and the node, and calculate the centroid of the unit body and the unit surface;

[0114] Step 2, read in the expression H of the fluid interface, which is a step function about the spatial coordinate x, that is, the function value is 1 when the spatial point coordinates are within the fluid interface (including the boundary), otherwise the function value is 0 ;The most commonly used fluid region shape for CFD solution: cuboid, you can read in the boundary coordinates of the cuboid: x min , x max ,y min ,y max ,z min ,z max The way to realize the reading ...

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Abstract

The invention belongs to the technical field of CFD, and particularly relates to a fluid distribution calculation method based on the VOF principle. The method can be suitable for any polyhedral grid, the defect that the VOF initial value of a CFD grid unit cannot be accurately calculated in the prior art is overcome, an interface unit is divided into a plurality of sub-tetrahedron or sub-triangular units, the VOF value of the interface sub-units is calculated by adopting multi-stage division-judgment by means of the equal division ratio, the calculation efficiency is effectively improved, and the computer memory is saved. Error analysis can be carried out on VOF initialization, if the error does not meet the preset precision, the maximum segmentation-judgment level needs to be improved, iterative calculation needs to be carried out until related conditions are met, calculation parameters are adjusted through error feedback, and high-precision calculation of VOF initialization is achieved.

Description

technical field [0001] The invention belongs to the technical field of CFD, and in particular relates to a fluid distribution calculation method based on the VOF principle. Background technique [0002] When using CFD (Computational Fluid Dynamics) technology to numerically simulate complementary miscible multiphase fluids, the VOF (Volume of Fluid) method is widely used to capture the moving interface; in the VOF method, the precise fluid interface position has been obtained. The discrete fluid volume fraction VOF value is replaced, so the fluid volume fraction VOF needs to be initialized before solving. Since the CFD technology discretizes the continuous physical calculation domain into a grid, and the grid is composed of a series of units, the VOF initialization is to calculate the fluid volume fraction value in each unit. [0003] Consider the computational domain Ω=Ω consisting of two immiscible fluids A and B A ∪Ω B ,like figure 1 As shown, and define a fluid indic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14G06F2111/10
Inventor 李超段文洋赵彬彬
Owner HARBIN ENG UNIV
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