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A cut-volume mesh thinc method for solving vof convection equations

A technology of volume mesh and mesh, applied in the field of cutting volume mesh THINC, which can solve problems such as solving VOF convection equations

Active Publication Date: 2022-08-02
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The purpose of the present invention is to overcome the deficiency that the existing non-structural THINC method cannot solve the VOF convection equation on the 3D cutting volume grid, and provide a cutting volume grid THINC method for solving the VOF convection equation

Method used

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  • A cut-volume mesh thinc method for solving vof convection equations
  • A cut-volume mesh thinc method for solving vof convection equations
  • A cut-volume mesh thinc method for solving vof convection equations

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Embodiment 1

[0176] The invention relates to a method for solving the VOF convection equation, in particular to a THINC method for solving the VOF convection equation on a cut volume grid.

[0177] Step 1: Read in the computational domain CFD mesh, such as the .msh format mesh file of Ansys Fluent, and calculate the necessary topology information and geometric parameters of each element, including element and surface, element and node, surface and node, surface Relationships to edges, edges and nodes, as well as element volumes, surface areas and normals, and centroids of elements and surfaces;

[0178] Step 2, read in the initial fluid distribution (ie VOF value) and velocity field;

[0179] Step 3, determine the type of each element in the grid, and classify it according to conventional non-structural elements (tetrahedron, hexahedron, triangular prism, quadrangular pyramid) and polyhedral elements;

[0180] Step 4, for the polyhedral element Ω i , which consists of the surface S ij (...

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Abstract

The invention belongs to the technical field of CFD, and in particular relates to a cutting volume grid THINC method for solving a VOF convection equation. Aiming at the characteristics of the cutting volume mesh unit, the present invention, for the polyhedral unit containing polygonal surfaces, forms a virtual unit belonging to a conventional non-structural type by merging the coplanar surfaces of the unit under the condition of retaining the actual topology of the unit, which can be directly applied to the present invention. There is the THINC method to reconstruct the hyperbolic tangent function; when calculating the VOF value of each surface of the original actual unit based on the reconstructed hyperbolic tangent function, for the polygonal surface, the collinear edges are first merged to form a virtual triangle or quadrilateral Surface, and then perform surface Gaussian numerical integration, so it is simpler and more efficient. The invention can realize the high-precision solution of the VOF convection equation based on the basic principle of the unstructured THINC method on the 3D cutting volume grid.

Description

technical field [0001] The invention belongs to the technical field of CFD, and in particular relates to a cutting volume grid THINC method for solving a VOF convection equation. Background technique [0002] In the CFD (Computational Fluid Dynamics) calculation, the VOF (Volume of Fluid) method is widely used in the interface simulation of immiscible multiphase fluids. Dynamic capture of the interface; for a given physical computing domain, CFD technology needs to first divide it into grids, and the grid is composed of a series of specific types of cells; the so-called fluid volume fraction VOF is a phase fluid in the grid cells. The volume ratio (area ratio in 2D); if the areas where fluids A and B are located are respectively recorded as Ω A and Ω B , and define a fluid indicator function H: [0003] [0004] where x=(x, y, z) represents the position vector, then in the grid unit Ω i Inside, the volume fraction VOF of fluid A i (abbreviated as φ i )defined as: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/20G06F30/28G06F30/23G06F113/08G06F119/14
CPCG06T17/20G06F30/28G06F30/23G06F2113/08G06F2119/14
Inventor 李超段文洋赵彬彬
Owner HARBIN ENG UNIV