A radial basis function (RBF) interpolation-based fluid-solid coupling interface data transfer method considering load uncertainty

Abstract

The present invention discloses a radial basis function (RBF) interpolation-based fluid-solid coupling interface data transfer method considering load uncertainty. The method considers the fluid domain uncertainty input in the fluid-solid coupling interface data transfer, the interval representation of load uncertainty is constructed, and the radial basis function with uncertainty is established.Based on the radial basis function (RBF) interpolation, the definite solution conditions of the coefficients to be solved are constructed. Furthermore, the uncertain undetermined coefficients are solved by the definite solution conditions of the physical quantities in the fluid domain of the fluid-solid coupling interface. Finally, based on the relationship between physical quantities and undetermined coefficients, the mathematical expression of the data transfer matrix is derived, and the reliable prediction of the load range and upper and lower bounds in the solid domain is completed, so asto realize the effective transfer of the load uncertainty data of the fluid-solid coupling interface.

Description

technical field [0001] The invention belongs to the technical field of coupling interface data transmission in fluid-solid coupling analysis, in particular to a fluid-solid coupling interface data transmission method based on radial basis function interpolation considering load uncertainty, in order to realize fluid-solid coupling interface with uncertainty The effective transfer and credible prediction of data provide a feasible theoretical basis and technical support. Background technique [0002] The research of data transfer method mainly focuses on the field of fluid-solid coupling in aerospace and civil engineering. Under the fluid load, the solid structure will produce displacement and velocity, and the deformation and movement of the solid structure will further affect the fluid load. Due to the great difference in grid type and density requirements of different physics calculation modules, the grids in the fluid domain and the solid domain do not match on the inter...

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Problems solved by technology

[0005] In the actual engineering structure, the load on the structure inevitably has uncertainty caused by inaccurate prediction and calculation error, which will affect the analysis and design of the structure, and even cause safety accidents such as structural damage.

At present, the influence of load uncertainty has been widely considered in the field of structural analysis and optimal design, and the corresponding theory has been formed, but it is still rare in the data transfer of fluid-structure interaction interface

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