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A Method for Constructing Free Surface Flow Model in Semi-implicit Algorithm of Moving Particles

A flow model and construction method technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as less research

Active Publication Date: 2016-06-08
江苏金洋造船有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the MPS method is mainly applied to the flow problem of Newtonian fluid with small Reynolds number, and there are few studies on non-Newtonian and turbulent flow models.

Method used

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  • A Method for Constructing Free Surface Flow Model in Semi-implicit Algorithm of Moving Particles
  • A Method for Constructing Free Surface Flow Model in Semi-implicit Algorithm of Moving Particles
  • A Method for Constructing Free Surface Flow Model in Semi-implicit Algorithm of Moving Particles

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] The overall calculation flow of the algorithm of the present invention includes the following steps (see figure 1 shown):

[0047] 1. Measure the physical parameters of flow field and fluid, including flow field size, fluid density and viscosity;

[0048] 2. Set the initial arrangement of particles according to the initial flow field;

[0049] 3. Use the turbulence model based on the semi-implicit algorithm of moving particles and the construction method of the non-Newtonian fluid model proposed by the present invention to simulate the fluid flow;

[0050] 4. Output the state of the particle model at each time step to the computer screen to display the real-time flow process of the flow field.

[0051] The following is a detailed introduction to each part of the improvement in the process. The discrete scheme and implementation steps of the basic moving part...

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Abstract

The invention provides an establishment method for a free surface flow model in a moving particle semi-implicit algorithm, comprising the following steps of: introducing a turbulence model which comprises a static Smagorinsky model and a dynamic Smagorinsky model in the form of Lagrange; treating a non-Newtonian fluid having a constitutive equation like mu = f(the absolute value ofgamma) by adopting a variable-viscosity Newtonian fluid model; and introducing a cubic spline kernel function, discretizing the shear stress of the non-Newtonian fluid by adopting the divergence discretization scheme of a smooth particle fluid dynamic method, and treating the free surface flow of the non-Newtonian fluid. According to the method provided by the invention, the sub-particle stress model of turbulence can be considered, and the method provided by the invention can be used for calculation for the non-Newtonian fluid.

Description

technical field [0001] The invention relates to the field of numerical simulation of turbulent flow and free surface flow of non-Newtonian fluids, and relates to the construction and optimization of numerical models of turbulent flow and non-Newtonian fluids. Background technique [0002] There are a lot of free surface flow problems in ship hydrodynamics, aerospace, hydraulic engineering and petroleum engineering. For example, the design of large liquid-carrying ships must consider the influence of internal liquid sloshing on the ship's driving stability. Liquid sloshing in the cabin is a typical free surface flow problem. Another example is the natural disaster of debris flow caused by dam failure. The formation and development of debris flow is also a typical free surface flow problem. Evaporation and condensation, inkjet printing, chemical reactions and other processes that are common in daily life are accompanied by the phenomenon of free surface flow. Because the phe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 陈斌向浩段广涛
Owner 江苏金洋造船有限公司