APDSMC flow field detection method specific to scale-span flow

A detection method and cross-scale technology, applied in the field of fluid mechanics, can solve the problems of inability to correctly identify the calculation area conditions, difficulty in selecting the transition area method, etc., and achieve the effect of shortening the time.

Inactive Publication Date: 2016-11-09
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this simple hybrid method has problems such as the inability to correctly identify the calculation area conditions, and the difficulty in selecting the transition zone method, which makes the hybrid method have a series of problems such as calculation accuracy and calculation efficiency.

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  • APDSMC flow field detection method specific to scale-span flow
  • APDSMC flow field detection method specific to scale-span flow
  • APDSMC flow field detection method specific to scale-span flow

Examples

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Embodiment Construction

[0034] The cluster used in this example is Shanghai Jiaotong University supercomputer, the cpu model is Intel Xeon CPU E5-2670, the operating system environment is Red Hat Enterprise Linux Server release 6.3, and the compiler is Intel MPI5.0.1-Fortran Compiler. The number of cores used is 8.

[0035] This example is to calculate a cross-scale flow flat plate side spray problem, which is used to compare the advantages of APDSMC and DSMC methods in terms of speed. Such as figure 2 As shown, three grids are made in the calculation domain shown, and the number of grid nodes is 241×401, 21×401, and 541×401 respectively. Evenly distributed in the flow field

[0036] Set the incoming flow conditions and jet flow conditions respectively as shown in the table:

[0037] Table Standard Study Calculation Parameters

[0038]

[0039] In this embodiment, the final calculated streamline diagram and pressure contour diagram are as follows image 3 Shown: This method can capture the c...

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Abstract

Provided is an APDSMC (Asymptotic Preserving Direct Simulation Monte Carlo) flow field detection method specific to scale-span flow, comprising: initializing a flow field, employing an uniform motion particle movement model and a vector cross product to determine the particle change logic in a grid after movement, and obtaining position information and grid topology information after simulation particle updating; mapping particle numbers based on the grid and particle numbers based on particles; and finally, stimulating particle collisions to update speed distribution of particles in the grid, and realizing flow field detection after sampling flow filed information. The APDSMC flow field detection method processes computation requirements of different areas based on an AP scheme, and can select collision kernels of different computational domains in a more intelligent mode so as to accelerate an original DSMC method, and to allow a new algorithm to compute computational example conditions of larger spanning scales and greater density.

Description

technical field [0001] The invention relates to a technology in the field of fluid mechanics, in particular to a direct simulation Monte Carlo (DSMC) flow field detection method for asymptotic preservation of cross-scale flow. Background technique [0002] With the continuous development of aerospace technology, people have a deeper and deeper demand for higher and faster aircraft. However, on the one hand, as the altitude and speed of the aircraft continue to increase, the traditional numerical simulation technology (CFD) is not suitable for the preliminary research tasks of the new aircraft under the new flight conditions; Solve complex flow problems. In this background, DSMC algorithm has been flourishing. The DSMC algorithm can accurately simulate the flow dynamics and flow heat problems in hypersonic thin fluids, and it is one of the powerful alternatives to solve the existing problems in the design of new aircraft. But at the same time, we found that when the flight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 刘洪张斌李林颖陈浩
Owner SHANGHAI JIAO TONG UNIV
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