Improved CLSVOF method for quickly building signed distance function by VOF function

A signed distance function and function technology, applied in the field of motion interface tracking numerical simulation, can solve the problems of complex construction process of the signed distance function, and achieve the effect of easy programming, strong applicability, and simple logic.

Inactive Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0012] Aiming at the problem that the signed distance function construction process in the CLSVOF method is too complicated, the present invention proposes an improved CLSVOF method for quickly constructing the signed distance function from the VOF function

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  • Improved CLSVOF method for quickly building signed distance function by VOF function
  • Improved CLSVOF method for quickly building signed distance function by VOF function
  • Improved CLSVOF method for quickly building signed distance function by VOF function

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Embodiment Construction

[0057] The present invention constructs the improved CLSVOF method of sign distance function fast by VOF function, comprises the following steps:

[0058] Step 1: Define the initial VOF function

[0059] According to the actual physical interface, the VOF function is defined within the mesh. The VOF function value of the interface grid is 0~1, the VOF function value of the grid inside the interface is 1, and the VOF function value of the grid outside the interface is 0.

[0060] Step 2: Get the Interface Grid

[0061] Firstly, the signed distance function is initialized by the VOF function value of the grid. The signed distance function of the grid with VOF value greater than 0.5 is positive, and the signed distance function of grid with VOF value less than 0.5 is negative. Secondly, the sub-grid technique is used to judge whether the current grid is an interface grid. The so-called sub-grid technology is to determine whether the current grid is an interface grid by judgin...

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Abstract

For the problems of a complex signed distance function building process, difficult expansion to three dimensions, low building efficiency and the like in an existing CLSVOF method, the invention provides an improved CLSVOF method for quickly building a signed distance function by a VOF function. The method comprises the steps of firstly finding out an interface grid by utilizing a sub-grid technology; secondly converting a VOF function in the interface grid into a signed distance function through a Newton iteration method, and based on this, building a signed distance function of a whole calculation region by adopting a fast scanning method; thirdly performing calculation through a WENO format and an upwind scheme to obtain an accurate interface normal vector value; and finally solving a VOF equation by adopting a corrected THINC algorithm pair.

Description

[0001] Technical field: [0002] The invention relates to an improved CLSVOF method for quickly constructing a signed distance function from a VOF function, which belongs to the field of numerical simulation of motion interface tracking. [0003] Background technique: [0004] Numerical simulation of motion interface tracking is a hot research topic at home and abroad. It involves many research fields such as materials, physics, chemistry, biology, etc. It has important theoretical value and practical significance to carry out research on it. [0005] In the early 1980s, Hirt and Nichols of the Los Alamos National Laboratory in the United States first proposed the volume of fluid method (Volume of Fluids, VOF). This method introduces a volume of fluid (VOF) function (with a value of 0 to 1) in the flow field, and realizes the tracking of the moving interface by solving the transport equation of the VOF function. The VOF method has a small amount of calculation, high interface ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 魏艳红钱龙根
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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