Efficient host unit searching method applicable to coupling CFD calculation of multiple sets of complex grids

Abstract

The invention provides an efficient host unit searching method applicable to coupling CFD calculation of multiple sets of complex grids. The method comprises the following steps of: S1 proposing a concept of barycentric coordinates, determining a position relationship between a node and a unit according to the barycentric coordinates of a current node and a current judgment unit, and giving a searching direction; S2 when the barycentric coordinates of the nodes and the units are calculated, under the condition that more than three grid points exist in one plane of any polyhedral unit, carrying out dyeing marking on the nodes in the plane, and ensuring that at least one grid point in one plane is determined to be not adopted before through the three points during calculation each time; S3 for an individual grid unit with an abnormally complex unit form, when the barycentric coordinates of the nodes and the unit are calculated, carrying out dyeing marking on in-plane and out-plane nodes of the current unit; and S4 according to the host unit information of which the search is completed, optimizing the search starting unit of the node which does not start to search, improving the search efficiency. According to the method, the search robustness and search efficiency of the host unit in the complex computational grid can be greatly improved.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to an efficient host unit search method applicable to multiple sets of complex grid coupled CFD calculations. Background technique [0002] With the development of CFD technology, the problems of numerical simulation of fluid dynamics are becoming more and more complex. In the numerical simulation of multi-body relative motion problems, multiple reference coordinate system methods, sliding grid methods, overlapping grid methods, etc. are often used. A set of grid-coupled computing techniques, in which the search operation of the host unit of the computing grid is performed. [0003] For the above-mentioned commonly used CFD calculation methods for dealing with multi-body relative motion, the correctness of the host unit search is crucial. Only when the correct host unit is found for the interpolation point can the flow field between the calculation domains be correctly ca...

AI Technical Summary

Problems solved by technology

At present, in computational grids with complex element forms, especially in arbitrary polyhedral grids that use the cutting element method combined with a body-fitted prism layer, the traditional host unit search method may fail to find the host unit or perform a cyclic search during the search process.

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