Dalian University of Technology

Yuguo Pei

Zhe Sun

Li Zou

Tiezhi Sun

Bo Zhou

Guiyong Zhang

Zhiqiang Wang

Zhenhao Li

Xinyu Ma

Jiuming Zhang

Zongbing Yu

Yanshun Zhu

Yichen Jiang

Shuwen Shi

Weitong Xu

Chenrui Tian

Lizhi Tang

Zhen Wang

Taian Hu

Guoqing Jin

Yingjie Gao

An improved modal decomposition method applicable to the analysis and reconstruction of the measured flow fields of internal solitary waves includes the following steps: S1. generating internal solitary waves and measuring a two-dimensional flow field sequence during the interaction of the internal solitary waves with the terrain; S2. extracting a target information from the two-dimensional flow field sequence and obtaining a flow field snapshot; S3. stitching the snapshots into a snapshot matrix in time order; S4. plotting the information density curve; S5. normalizing the information density curve and determining split points; S6. setting the snapshot matrix between two adjacent split points as a linear evolutionary characteristic stage; and S7. performing dynamic mode decomposition on the linear evolutionary characteristic stages.

Mode decomposition method applicable to flow field analysis and reconstruction of internal solitary wave test

A test device suitable for acceleratory oblique water entry of a wedge has a frame, a water tank placed below the frame, an accelerator installed above the frame, an obliquing device connected to the frame, a wedge connected to the obliuqing device and an observation system. The frame is provided with vertical slide rails and a transverse slide rail. The accelerator mainly includes an air cylinder and an air compressor. The wedge is a flexible wedge or a rigid wedge. The observation system includes a pressure sensor, a strain sensor, a velocity sensor, an acceleration sensor and a particle image velocimetry device. The repeatability of the test process can be ensured by controlling the output pressure of the air cylinder.

Test device suitable for acceleratory oblique water entry of a wedge

The present disclosure provides a parameter design and numerical simulation method for jet trencher nozzle, comprising the following steps: S. designing parameters of nozzle; S. selecting the parameters of nozzle; S. establishing a geometric model; S. setting boundary conditions and delineating grids; S. performing numerical simulation using Flow-3D; and S. performing results processing and analysis. According to the present invention, the whole process of nozzle flushing and ground breaking can be simulated, the size of the cross-section of the flushing trench is measured, and by analyzing the obtained result, the reasonability of nozzle radius parameter design can be verified, and a certain reference is provided for design of inclination angle parameters.

Method for parameter design and numerical simulation of jet trencher nozzle

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Liaoning, China

Yuguo Pei