A liquid tank sloshing semi-analytical solving method based on partition modal characteristic analysis, medium and equipment

By employing a partitioned modal characteristic analysis method, the shortcomings in computational efficiency and accuracy in liquid sloshing problems are addressed. This method enables efficient and high-precision solutions for complex geometric boundaries and multi-layered liquid systems, and is applicable to liquid sloshing analysis in liquefied natural gas tank design and offshore floating production storage and offloading (FPSO) facilities.

CN122452186APending Publication Date: 2026-07-24HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HOHAI UNIV
Filing Date
2026-06-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies struggle to simultaneously meet the computational accuracy and efficiency requirements for liquid sloshing problems in engineering applications, especially when dealing with complex geometric boundaries, multi-layered liquid sloshing, and fluid-structure interaction problems, resulting in high computational complexity and poor numerical stability.

Method used

The partitioned modal characteristic analysis method is adopted. Through region decomposition, interface matching and eigenvalue analysis, the interface matching equation is constructed. Combined with column-scale equilibrium preprocessing, the natural frequency and sloshing mode of the liquid are solved, and the free surface wave height response time history is calculated.

Benefits of technology

It improves computational efficiency and solution accuracy, can flexibly handle complex geometric boundaries and multi-layer liquid systems, supports fluid-structure interaction problems, and maintains high accuracy over long time scales.

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Abstract

The application discloses a liquid tank sloshing semi-analytical solving method based on partition modal characteristic analysis, a medium and equipment, and belongs to the technical field of ship and ocean engineering. A liquid domain in a liquid tank is divided into a plurality of regular sub-regions, and an interface matching equation is constructed; a characteristic equation set is established, the characteristic equation set is converted into a generalized eigenvalue equation; scale balance preprocessing is performed, the preprocessed generalized eigenvalue equation is generated, and the preprocessed generalized eigenvalue equation is solved to obtain liquid natural frequency and liquid sloshing mode; according to the liquid sloshing mode and external excitation parameters, a free liquid surface wave height response time history is calculated; and a liquid tank sloshing response prediction result is output. The partition modal characteristic analysis method provided by the application adopts an analytical-numerical hybrid algorithm, and the calculation time is not affected by grid division; under the condition of ensuring sufficient calculation precision, the efficiency of a viscous flow solver is improved; and through scale balance preprocessing, the stability and precision of generalized eigenvalue solving are improved.
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