US 11,790,137 B2
Method for parameter design and numerical simulation of jet trencher nozzle
Li Zou, Liaoning (CN); Lizhi Tang, Tianjin (CN); Zhe Sun, Liaoning (CN); Yanshun Zhu, Tianjin (CN); Yuguo Pei, Liaoning (CN); Zhiqiang Wang, Tianjin (CN); Weitong Xu, Liaoning (CN); Guoqing Jin, Liaoning (CN); and Zhen Wang, Liaoning (CN)
Assigned to DALIAN UNIVERSITY OF TECHNOLOGY, Liaoning (CN)
Appl. No. 17/59,008
Filed by DALIAN UNIVERSITY OF TECHNOLOGY, Liaoning (CN)
PCT Filed Aug. 9, 2019, PCT No. PCT/CN2019/099882
§ 371(c)(1), (2) Date Nov. 25, 2020,
PCT Pub. No. WO2020/164233, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 201910110150.0 (CN), filed on Feb. 11, 2019.
Prior Publication US 2021/0209275 A1, Jul. 8, 2021
Int. Cl. G06F 30/28 (2020.01); G06F 30/17 (2020.01); G06F 113/08 (2020.01); G06F 111/10 (2020.01)
CPC G06F 30/28 (2020.01) [G06F 30/17 (2020.01); G06F 2111/10 (2020.01); G06F 2113/08 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A method for parameter design and numerical simulation of a jet trencher nozzle, comprising the following steps:
Step S1, designing parameters of nozzle, wherein:
at a distance of x from the jet trencher nozzle, according to an effective pressure calculation equation of jet flow:

OG Complex Work Unit Math
 denying a relation between a nozzle radius and an inclination angle of β when the effective pressures of jet flow of an inclined nozzle and a vertical nozzle are equal at a same vertical distance:

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 R being a radius of the jet trencher nozzle, p being an outlet dynamic pressure of the jet trencher nozzle, Rv being a radius of the vertical nozzle, Ri being a radius of the inclined nozzle;
Step S2, selecting parameters of the nozzle, wherein:
according to the equation

OG Complex Work Unit Math
 derived in Step S1, taking the radius Rv of the vertical nozzle as a fixed value, and selecting different inclination angles β to obtain different radii Ri of inclined nozzles;
Step S3, establishing a geometric model, wherein:
according to the nozzle parameters selected in Step S2, establishing a combination geometric model of the vertical nozzle and the inclined nozzle;
Step S4, setting boundary conditions and delineating grids, wherein:
importing the combination geometric model established in Step S3 into a software program, dividing a computational domain into an upper block and a lower block connected with each other from top to bottom, defining boundaries of the upper block and the lower block, and delineating grids on the computational domain and checking the quality of the grids;
Step S5, performing numerical simulation, comprising:
adding a sediment physical model and defining the sediment parameters, setting an initial condition, time step of the computational domain, a physical time and a maximum number of iterations;
solving numerical values; and
Step S6, performing results processing and analysis deriving a topographic surface file based on simulation results obtained in Step S5, processing the topographic surface file to obtain and analyze the geometric parameters of a flushing trench profile.