CN106096190A - A kind of method of structure/non-structural couple solution CFD - Google Patents
A kind of method of structure/non-structural couple solution CFD Download PDFInfo
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- CN106096190A CN106096190A CN201610481046.9A CN201610481046A CN106096190A CN 106096190 A CN106096190 A CN 106096190A CN 201610481046 A CN201610481046 A CN 201610481046A CN 106096190 A CN106096190 A CN 106096190A
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Abstract
The method that the invention discloses a kind of structure/non-structural couple solution CFD, the method for described couple solution CFD comprises the following steps: S1, generating structure/unstructured hybrid grids；S2, carries out the subregion of hybrid grid according to the efficiency of structure, non-structural solver；S3, calls structure respectively and non-structural solver carries out CFD calculating；Said method based on hybrid grid carry out CFD solve time, overcome existing method and can lose the problem of structure algorithm advantage, the motility of unstrctured grid can not only be played, moreover it is possible to give full play to efficient, the advantage in high precision of structured grid.
Description
Technical field
The invention belongs to hydrodynamics technology field, the method being specifically related to a kind of structure/non-structural couple solution CFD.
Background technology
Along with the development of large-scale scientific computer, Fluid Mechanics Computation (Computational Fluid
Dynamics, is called for short CFD) develop gradually ripe, have been widely used among the design process of industrial products.CFD technology
Over one important symbol of development is nearly ten or twenty year, the appearance successively of various CFD software.The Core Feature of CFD software is logical
Cross and solve N-S Fluid Control Equation acquisition information of flow, mainly include three steps: first, use and calculate grid cell (such as three
Dihedral, tetragon, tetrahedron, hexahedron etc.) discrete calculation territory；Then, calculating grid is asked by the method for computational mathematics
Solve fluid governing equation；Finally, from discrete numerical result, information needed is extracted.
At present, the overwhelming majority CFD software use structured grids otherwise use unstrctured grid computational fields is carried out from
Dissipating, and be respectively adopted corresponding structure algorithm or non-structural algorithm, both algorithms are respectively arranged with pluses and minuses: structured grid (algorithm) is counted
Calculate efficiency height, precision height, but for complicated geometric shape, generating structure grid will expend a large amount of hand labor；Non-
Structured grid (algorithm) advantage is that mess generation automaticity is high, is prone to mesh adaption, but for opposed configuration grid,
There is the problem that computational efficiency is low, resource cost is serious.Along with the development of CFD technology, integrated structure grid and unstrctured grid
Advantage and the hybrid grid that occurs are widely used, and have become as Main Trends of The Development.But, being usually at present will be mixed
Closing grid destructuring, this solution efficiency is low, precision is low and of long duration.
It is thus desirable to provide a kind of method for solving efficient, high-precision solves defect present in prior art.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to all use when processing hybrid grid for CFD software
Non-structural algorithm thus lose the problem efficient, feature in high precision of structured grid (algorithm), the present invention proposes a kind of knot
The method of structure/non-structural couple solution CFD so that CFD software obtains a preferable balance between efficiency and precision, thus
Limits ground plays structured grid (algorithm), the advantage of unstrctured grid (algorithm).
The method of a kind of structure/non-structural couple solution CFD, the method for described structure/non-structural couple solution CFD includes
Following steps:
S1, generating structure/unstructured hybrid grids；
S2, carries out the subregion of hybrid grid according to the efficiency of structure, non-structural solver；
S3, calls structure respectively and non-structural solver carries out CFD calculating.
Preferably, described step S1, particularly as follows: use structured grid discrete part relatively simple for geometric shape, remains
Part uses unstrctured grid discrete, is formed one to one or one-to-many, the interface of mesh point coincidence between two kinds of grids.
Preferably, when described step S2 is particularly as follows: suppose to use a set of structured grid to solve mark modulus problem, structure solver
Time-consuming is Ts, and unstrctured grid is time-consumingly Tu, then enter with the relation that unstrctured grid amount is Tu/Ts according to the structure of each subregion
Row subregion.
Preferably, described step S3, particularly as follows: use structure algorithm on structured grid, uses non-on unstrctured grid
Structure algorithm, the two solves simultaneously；When processing the interface between block structure and non-structural block, by a Rotating fields of next-door neighbour's interface
Grid uses destructuring algorithm to calculate flux, limiter, to ensure conservativeness.
Technical scheme has the advantages that
The method of a kind of structure/non-structural couple solution CFD that the present invention provides, based on hybrid grid carry out CFD solve time,
Overcome existing method and can lose the problem of structure algorithm advantage, the motility of unstrctured grid can not only be played, moreover it is possible to fully
Play efficient, the advantage in high precision of structured grid.
Accompanying drawing explanation
Below by drawings and Examples, technical scheme is described in further detail.
Fig. 1 is the method efficiency ratio with existing destructuring method for solving of present configuration/non-structural couple solution CFD
Relatively.
Detailed description of the invention
In order to have a clear understanding of technical scheme, its detailed structure be will be set forth in the description that follows.Obviously, originally
The concrete also deficiency of implementing of inventive embodiments is limited to the specific details that those skilled in the art is familiar with.The present invention's is preferred real
Execute example to be described in detail as follows, in addition to these embodiments described in detail, it is also possible to there is other embodiments.
With embodiment, the present invention is described in further details below in conjunction with the accompanying drawings.
Structure/non-structural couple solution method that the present invention proposes, main thought is to use structure to calculate on structured grid
Method, and on unstrctured grid, use non-structural algorithm, and the interface of structure/unstrctured grid is carried out compatibility process,
Key step includes:
Step 1: generating structure/unstructured hybrid grids.Use structured grid discrete part relatively simple for geometric shape,
Remainder uses unstrctured grid discrete, is formed one to one or one-to-many, the boundary of mesh point coincidence between two kinds of grids
Face.
Step 2: carry out the subregion of hybrid grid according to the efficiency of structure, non-structural solver.Assuming that use a nested structure
When grid solves mark modulus problem, structure solver is time-consumingly Ts, and unstrctured grid is time-consumingly Tu, then according to the structure of each subregion
Subregion is carried out with the relation that unstrctured grid amount is Tu/Ts.
Step 3:CFD calculates.Structured grid uses structure algorithm (solver), unstrctured grid uses non-
Structure algorithm (solver), the two solves simultaneously.When processing the interface between block structure and non-structural block, by next-door neighbour's interface
One Rotating fields grid uses destructuring algorithm to calculate flux, limiter, to ensure conservativeness.
Visible with reference to Fig. 1, the invention enables efficiency to be increased dramatically by employing.
A kind of method of non-structural couple solution CFD that the present invention provides, based on hybrid grid carry out CFD solve time,
Overcome existing method and can lose the problem of structure algorithm advantage, the motility of unstrctured grid can not only be played, moreover it is possible to fully
Play efficient, the advantage in high precision of structured grid.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, to the greatest extent
The present invention has been described in detail by pipe with reference to above-described embodiment, and those of ordinary skill in the field still can be to this
Bright detailed description of the invention is modified or equivalent, these without departing from spirit and scope of the invention any amendment or
Equivalent, all within the claims that application is awaited the reply.
Claims (4)
1. the method for structure/non-structural couple solution CFD, it is characterised in that the method for described couple solution CFD include with
Lower step:
S1, generating structure/unstructured hybrid grids；
S2, carries out the subregion of hybrid grid according to the efficiency of structure, non-structural solver；
S3, calls structure respectively and non-structural solver carries out CFD calculating.
The method of structure the most according to claim 1/non-structural couple solution CFD, it is characterised in that described step S1 has
Body is: use structured grid discrete part relatively simple for geometric shape, and remainder uses unstrctured grid discrete, two kinds
Formed between grid one to one or one-to-many, mesh point overlap interface.
The method of structure the most according to claim 1/non-structural couple solution CFD, it is characterised in that described step S2 has
Body is: during assuming that use a set of structured grid to solve mark modulus problem, structure solver is time-consumingly Ts, and unstrctured grid is time-consumingly
Tu, then carry out subregion according to the structure of each subregion with the relation that unstrctured grid amount is Tu/Ts.
The method of structure the most according to claim 1/non-structural couple solution CFD, it is characterised in that described step S3 has
Body is: use structure algorithm on structured grid, uses non-structural algorithm on unstrctured grid, and the two solves simultaneously；Process
During interface between block structure and non-structural block, destructuring algorithm is used to calculate a Rotating fields grid of next-door neighbour's interface logical
Amount, limiter, to ensure conservativeness.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106780747A (en) * | 2016-11-30 | 2017-05-31 | 西北工业大学 | A kind of method that Fast Segmentation CFD calculates grid |
Citations (2)
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| CN103970715A (en) * | 2014-04-21 | 2014-08-06 | 中国石油大学(北京) | Mesh generation computing method and device |
| CN105224726A (en) * | 2015-09-11 | 2016-01-06 | 南京航空航天大学 | Structured grid Dynamic mesh is used for the method for unstrctured grid flow field calculation device |
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2016
- 2016-06-28 CN CN201610481046.9A patent/CN106096190A/en active Pending
Patent Citations (2)
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|---|---|---|---|---|
| CN103970715A (en) * | 2014-04-21 | 2014-08-06 | 中国石油大学(北京) | Mesh generation computing method and device |
| CN105224726A (en) * | 2015-09-11 | 2016-01-06 | 南京航空航天大学 | Structured grid Dynamic mesh is used for the method for unstrctured grid flow field calculation device |
Non-Patent Citations (3)
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| XIN HE 等: "HyperFLOW:A structured/unstructured hybrid integrated computational environment for multi-purpose fluid simulation", 《PROCEDIA ENGINEERING》 * |
| 赫新 等: "大型通用CFD软件体系结构与数据结构研究", 《空气动力学学报》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106780747A (en) * | 2016-11-30 | 2017-05-31 | 西北工业大学 | A kind of method that Fast Segmentation CFD calculates grid |
| CN106780747B (en) * | 2016-11-30 | 2019-05-10 | 西北工业大学 | A kind of method that Fast Segmentation CFD calculates grid |
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Application publication date: 20161109 |
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