Efficient parallel algorithm for three-dimensional acoustic elastic generalized hydrodynamic coefficient
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A technology of hydrodynamic coefficient and parallel algorithm, which is applied in the direction of design optimization/simulation, etc., can solve the problems of large calculation amount and time-consuming of wet surface element source strength, affecting calculation speed and calculation time, etc., and achieves compact structure, convenient operation, The effect of increasing the calculation speed
Active Publication Date: 2020-03-06
CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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[0004] When the number N of wet surface elements of the ship is large (for example, N>100000), the amount of calculation of the above-mentioned wet surface element source strength will be very large and time-consuming, which seriously affects the actual engineering application of the three-dimensional acoustoelastic analysis method for ships. Calculation speed and calculation time become a bottleneck problem
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Embodiment 1
[0080] Embodiment one: if Figure 4 As shown, the Green's function partial derivative matrix at a certain frequency is the 7x7 matrix, and the method of two-dimensional parallel division in the fourth step is described.
[0081] to N b Indicates the unit block size of the matrix, and the number of processes in the frequency grouping is n gp =6, the number of rows is N col =3, the number of listed processes is N row = 2, satisfying n gp =N row ×N col ;
[0082] Each element in the matrix is fetched at intervals in the row direction and column direction, that is, the row direction is spaced at 3 intervals, and the column direction is spaced at 2 intervals, thereby forming blocks corresponding to the number of processes, and using myid for each block label, so as to realize the two-dimensional parallel division of the 7x7 matrix.
Embodiment 2
[0083] Embodiment 2: Set the total number of frequencies as K=3, and the number of frequency groups as n gro =2, the total number of processes is n pro =8, explain the efficient parallel algorithm in the first step to the fifth step.
[0084] The first step: calculate the dry mode of the ship structure based on the finite element software, and obtain the corresponding vibration mode displacement matrix of the dry mode;
[0085] The second step: the total frequency is K=3, that is, ω 1 , ω 2and ω 3 three frequencies;
[0086] The number of processes assigned to each frequency group is n gp =n pro / n gro =8 / 2=4;
[0087] Based on load balancing, the total frequency K is divided into each frequency group, and the first frequency group is divided into two frequencies (ω 1 and ω 2 ), the second frequency grouping is assigned to a frequency (ω 3 );
[0088] Step 3: The first frequency group and the second frequency group are calculated in parallel without interfering wi...
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Abstract
The invention relates to an efficient parallel algorithm for a three-dimensional acoustic elastic generalized hydrodynamic coefficient. The efficient parallel algorithm comprises the following steps:obtaining a vibration mode displacement matrix of a ship dry mode based on finite element software; respectively distributing the total frequency number and the total process number into each frequency group; obtaining a Green function matrix and a partial derivative matrix of the Green function matrix for each frequency in each frequency group; constructing a wet surface element source intensitymatrix equation for a single frequency, performing two-dimensional parallel division on a Green function partial derivative matrix and a vibration mode displacement normal component matrix in the equation, and performing calculation to obtain a wet surface element source intensity matrix; and calculating the dry-mode attached water mass and the attached water damping in the generalized hydrodynamic coefficient. Aiming at a ship three-dimensional acoustic elasticity analysis method, the efficient parallel algorithm distributes the total frequency number to the frequency groups for parallel calculation, and performs two-dimensional parallel division on the Green function partial derivative matrix and the vibration mode displacement normal component matrix, so that the bottleneck problem of large calculation amount is effectively solved, and the large-scale engineering calculation applicability of the ship three-dimensional acoustic elasticity analysis method is greatly improved.
Description
technical field [0001] The invention relates to the technical field of ship underwater radiation noise calculation and acoustic boundary element calculation, in particular to a high-efficiency parallel algorithm for three-dimensional acoustic elastic generalized hydrodynamic coefficients. Background technique [0002] The ship three-dimensional acoustoelasticity frequency domain analysis method inherits the fluid-solid coupling processing method of the classic hydroelasticity theory of floating bodies (Wu, Hydroelasticity of floating bodies, 1984), and selects the dry mode that is easy to solve and has orthogonal completeness (the structure in mode in vacuum) as a generalized basis function, by calculating the generalized hydrodynamic coefficient of the dry mode (including the attached water mass and attached water damping), the acoustic Elastic coupling generalized dynamic equations; the calculation of generalized hydrodynamic coefficients, that is, attached water mass and ...
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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23
Inventor 邹明松
Owner CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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